Subject: Re: [Mgs] 1980 MGB wiring question

From: "PaulHunt73" <[email-masked]>
Date: Tue, 10 Aug 2021 10:43:29 +0100 rIIb90g4uGsxy1Rw4LioXlqn/ex+gjVUOPNhNZsen3gVvaJNqpf5ZwWIHQnAYygCP+khpN4L60ZFqG5HFguHHq+TU7mosgelS6M=

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The horn wiring changed on late model cars so that the stalk button puts =
out 12v to the horns, and the horns only have one wire each as they pick =
up an earth from their mountings.

As such the horn push should have purple (12v, fused always live) and =
purple/black (to the horn) wires.  First thing to check is, does the =
interior light work? If not maybe the purple supply from the fusebox has =
failed, bottom fuse.

If so, with it lit press the horn button.  Does it go out?  If so then =
there is a bad connection back through the fusebox.

Next it depends on whether it is easier for you to check the wiring at =
the multi-plug by the column, or at the horns.  In the former case look =
for the purple and purple black wires and check them (connector still =
plugged together) for 12v on the purple all the time, and on the =
purple/black when the button is pushed.  If on the purple but not the =
purple/black the switch or wiring in the stalk is faulty.  Sometimes the =
wires are moulded into the connector blocks so you can only test by =
parting the connectors just enough to expose the pins, but they are =
still making contact.

At the horns with the button pressed you should have 12v on the =
purple/black spades on the horns (wiring connected).  If not and the =
test at the column multi-plug was good then the circuit back to there is =
faulty, most likely is a bad connection between the wiring connector and =
horn spade.

If you see 12v on the horn spade check a clean part of the horn body for =
12v as well. If you see that then the horn earthing is bad.  If you saw =
12v on the purple/black spade but not on the body then the horn is bad =
internally.

It might seem unlikely that the fault is at the horns in both cases, but =
anything is possible.

BTW stuff the trumpets with rags to avoid getting a loud blast if you =
disturb the fault and one or other should suddenly start working :o)

PaulH
  ----- Original Message -----=20

  We=E2=80=99re working on a 1980 B with a maddening assortment of =
electrical problems.  Right now we=E2=80=99re trying to figure out why =
the horn push won=E2=80=99t work=E2=80=94and all the wiring diagrams =
(Bentley & Advance Autowire)=E2=80=94show the horn as having purple =
wiring=E2=80=94apparently meant for the  horn push in the steering wheel =
button, not the push-in-the-wiper-stalk of this car.  Any advice from =
the List?

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<DIV>The horn wiring changed on late model cars so that the stalk button =
puts=20
out 12v to the horns, and the horns only have one wire each as they pick =
up an=20
earth from their mountings.</DIV>
<DIV>&nbsp;</DIV>
<DIV>As such the horn push should have purple (12v, fused always live) =
and=20
purple/black (to the horn) wires.&nbsp; First thing to check is, does =
the=20
interior light work? If not maybe the purple supply from the fusebox has =
failed,=20
bottom fuse.</DIV>
<DIV>&nbsp;</DIV>
<DIV>If so, with it lit press the horn button.&nbsp; Does it go =
out?&nbsp; If so=20
then there is a bad connection back through the fusebox.</DIV>
<DIV>&nbsp;</DIV>
<DIV>Next it depends on whether it is easier for you to check the wiring =
at the=20
multi-plug by the column, or at the horns.&nbsp; In the former case look =
for the=20
purple and purple black wires and check them (connector still plugged =
together)=20
for 12v on the purple all the time, and on the purple/black when the =
button is=20
pushed.&nbsp; If on the purple but not the purple/black the switch or =
wiring in=20
the stalk is faulty.&nbsp; Sometimes the wires are moulded into the =
connector=20
blocks so you can only test by parting the connectors just enough to =
expose the=20
pins, but they are still making contact.</DIV>
<DIV>&nbsp;</DIV>
<DIV>At the horns with the button pressed you should have 12v on the=20
purple/black&nbsp;spades on the horns (wiring connected).&nbsp; If not =
and the=20
test at the column multi-plug was good then the circuit back to there is =
faulty,=20
most likely is a bad connection between the wiring connector and horn=20
spade.</DIV>
<DIV>&nbsp;</DIV>
<DIV>If you see 12v on the horn spade&nbsp;check a clean part of the =
horn body=20
for 12v as well. If you see that then the horn earthing is bad.&nbsp; If =
you saw=20
12v on the purple/black spade but not on the body then the horn is bad=20
internally.</DIV>
<DIV>&nbsp;</DIV>
<DIV>It might seem unlikely that the fault is at the horns in both =
cases, but=20
anything is possible.</DIV>
<DIV>&nbsp;</DIV>
<DIV>BTW stuff the trumpets with&nbsp;rags to avoid getting a loud blast =
if you=20
disturb the fault and one or other should suddenly start working =
:o)</DIV>
<DIV>&nbsp;</DIV>
<DIV>PaulH</DIV>
<BLOCKQUOTE=20
style=3D"BORDER-LEFT: #000000 2px solid; PADDING-LEFT: 5px; =
PADDING-RIGHT: 0px; MARGIN-LEFT: 5px; MARGIN-RIGHT: 0px">
  <DIV style=3D"FONT: 10pt arial">----- Original Message ----- </DIV>
  <DIV><BR></DIV>
  <DIV class=3DWordSection1>
  <P class=3DMsoNormal>We=E2=80=99re working on a 1980 B with a =
maddening assortment of=20
  electrical problems.&nbsp; Right now we=E2=80=99re trying to figure =
out why the horn=20
  push won=E2=80=99t work=E2=80=94and all the wiring diagrams (Bentley =
&amp; Advance=20
  Autowire)=E2=80=94show the horn as having purple =
wiring=E2=80=94apparently meant for the&nbsp;=20
  horn push in the steering wheel button, not the =
push-in-the-wiper-stalk of=20
  this car.&nbsp; Any advice from the =
List?</P></DIV></BLOCKQUOTE></BODY></HTML>

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---

From: Michael MacLean <[email-masked]>
Date: Tue, 10 Aug 2021 10:01:09 -0700

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Speaking of horns, my 1969 MGB GT has only one horn.  Is that original?  It
has two wires going to it.  It works OK, but it just sounds weak.  What is
a good alternative?  Can I wire two horns here?
Mike MacLean

On Tue, Aug 10, 2021 at 2:49 AM PaulHunt73 <[email-masked]>
wrote:

> The horn wiring changed on late model cars so that the stalk button puts
up
> an earth from their mountings.
>
> As such the horn push should have purple (12v, fused always live) and
> purple/black (to the horn) wires.  First thing to check is, does the
> interior light work? If not maybe the purple supply from the fusebox has
> failed, bottom fuse.
>
> If so, with it lit press the horn button.  Does it go out?  If so then
> Next it depends on whether it is easier for you to check the wiring at th=
e
> multi-plug by the column, or at the horns.  In the former case look for t=
he
> purple and purple black wires and check them (connector still plugged
> together) for 12v on the purple all the time, and on the purple/black whe=
n
> the button is pushed.  If on the purple but not the purple/black the swit=
ch
> or wiring in the stalk is faulty.  Sometimes the wires are moulded into t=
he
> connector blocks so you can only test by parting the connectors just enou=
gh
> to expose the pins, but they are still making contact.
>
> At the horns with the button pressed you should have 12v on the
> purple/black spades on the horns (wiring connected).  If not and the test
> at the column multi-plug was good then the circuit back to there is fault=
y,
> most likely is a bad connection between the wiring connector and horn spa=
de.
>
> If you see 12v on the horn spade check a clean part of the horn body for
> 12v as well. If you see that then the horn earthing is bad.  If you saw 1=
2v
> on the purple/black spade but not on the body then the horn is bad
> internally.
>
> It might seem unlikely that the fault is at the horns in both cases, but
> anything is possible.
>
> BTW stuff the trumpets with rags to avoid getting a loud blast if you
> ----- Original Message -----
>
> We=E2=80=99re working on a 1980 B with a maddening assortment of electric=
al
> problems.  Right now we=E2=80=99re trying to figure out why the horn push=
 won=E2=80=99t
> work=E2=80=94and all the wiring diagrams (Bentley & Advance Autowire)=E2=
=80=94show the horn
> as having purple wiring=E2=80=94apparently meant for the  horn push in th=
e steering
> wheel button, not the push-in-the-wiper-stalk of this car.  Any advice fr=
om
> Donate: http://www.team.net/donate.html
> Suggested annual donation  $12.75
>
> Unsubscribe:
> http://autox.team.net/mailman/options/mgs/[email-masked]
>

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<div dir=3D"ltr"><div>Speaking of horns, my 1969 MGB GT has only one horn.=
=C2=A0 Is that original?=C2=A0 It has two wires going to it.=C2=A0 It works=
 OK, but it just sounds weak.=C2=A0 What is a good alternative?=C2=A0 Can I=
 wire two horns here?</div><div>Mike MacLean<br></div></div><br><div class=
=3D"gmail_quote"><div dir=3D"ltr" class=3D"gmail_attr">On Tue, Aug 10, 2021=
 at 2:49 AM PaulHunt73 &lt;<a href=3D"mailto:[email-masked]">pa=
[email-masked]</a>&gt; wrote:<br></div><blockquote class=3D"gmail=
_quote" style=3D"margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204=
,204);padding-left:1ex"><u></u>

<div style=3D"overflow-wrap: break-word;" bgcolor=3D"#ffffff" lang=3D"EN-US=
">
<div>The horn wiring changed on late model cars so that the stalk button pu=
ts=20
out 12v to the horns, and the horns only have one wire each as they pick up=
 an=20
earth from their mountings.</div>
<div>=C2=A0</div>
<div>As such the horn push should have purple (12v, fused always live) and=
=20
purple/black (to the horn) wires.=C2=A0 First thing to check is, does the=
=20
interior light work? If not maybe the purple supply from the fusebox has fa=
iled,=20
bottom fuse.</div>
<div>=C2=A0</div>
<div>If so, with it lit press the horn button.=C2=A0 Does it go out?=C2=A0 =
If so=20
then there is a bad connection back through the fusebox.</div>
<div>=C2=A0</div>
<div>Next it depends on whether it is easier for you to check the wiring at=
 the=20
multi-plug by the column, or at the horns.=C2=A0 In the former case look fo=
r the=20
purple and purple black wires and check them (connector still plugged toget=
her)=20
for 12v on the purple all the time, and on the purple/black when the button=
 is=20
pushed.=C2=A0 If on the purple but not the purple/black the switch or wirin=
g in=20
the stalk is faulty.=C2=A0 Sometimes the wires are moulded into the connect=
or=20
blocks so you can only test by parting the connectors just enough to expose=
 the=20
pins, but they are still making contact.</div>
<div>=C2=A0</div>
<div>At the horns with the button pressed you should have 12v on the=20
purple/black=C2=A0spades on the horns (wiring connected).=C2=A0 If not and =
the=20
test at the column multi-plug was good then the circuit back to there is fa=
ulty,=20
most likely is a bad connection between the wiring connector and horn=20
spade.</div>
<div>=C2=A0</div>
<div>If you see 12v on the horn spade=C2=A0check a clean part of the horn b=
ody=20
for 12v as well. If you see that then the horn earthing is bad.=C2=A0 If yo=
u saw=20
12v on the purple/black spade but not on the body then the horn is bad=20
internally.</div>
<div>=C2=A0</div>
<div>It might seem unlikely that the fault is at the horns in both cases, b=
ut=20
anything is possible.</div>
<div>=C2=A0</div>
<div>BTW stuff the trumpets with=C2=A0rags to avoid getting a loud blast if=
 you=20
disturb the fault and one or other should suddenly start working :o)</div>
<div>=C2=A0</div>
<div>PaulH</div>
<blockquote style=3D"border-left:2px solid rgb(0,0,0);padding-left:5px;padd=
ing-right:0px;margin-left:5px;margin-right:0px">
  <div style=3D"font:10pt arial">----- Original Message ----- </div>
  <div><br></div>
  <div class=3D"gmail-m_-4576391806103799009WordSection1">
  <p class=3D"MsoNormal">We=E2=80=99re working on a 1980 B with a maddening=
 assortment of=20
  electrical problems.=C2=A0 Right now we=E2=80=99re trying to figure out w=
hy the horn=20
  push won=E2=80=99t work=E2=80=94and all the wiring diagrams (Bentley &amp=
; Advance=20
  Autowire)=E2=80=94show the horn as having purple wiring=E2=80=94apparentl=
y meant for the=C2=A0=20
  horn push in the steering wheel button, not the push-in-the-wiper-stalk o=
f=20
  this car.=C2=A0 Any advice from the List?</p></div></blockquote></div>
_______________________________________________<br>
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[email-masked]

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---

From: Max Heim <[email-masked]>
Date: Tue, 10 Aug 2021 10:54:41 -0700

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That doesn=E2=80=99t seem to be correct. There should be two horns, and =
they should be mounted further forward, toward the bonnet latch =
platform, one on ether side. That is also not the original type of horn.

I am sure you can find a drawing showing this in either the Bentley =
manual or the Moss Motors catalog.

You can tell that the horn wire is being stretched to reach the current =
location.

--
Max Heim
'66 MGB

> On Aug 10, 2021, at 10:01 AM, Michael MacLean =
<[email-masked]> wrote:
>=20
> Speaking of horns, my 1969 MGB GT has only one horn.  Is that =
original?  It has two wires going to it.  It works OK, but it just =
sounds weak.  What is a good alternative?  Can I wire two horns here?
> Mike MacLean
>=20
> On Tue, Aug 10, 2021 at 2:49 AM PaulHunt73 <[email-masked] =
> The horn wiring changed on late model cars so that the stalk button =
puts out 12v to the horns, and the horns only have one wire each as they =
pick up an earth from their mountings.
> =20
> If you see 12v on the horn spade check a clean part of the horn body =
for 12v as well. If you see that then the horn earthing is bad.  If you =
saw 12v on the purple/black spade but not on the body then the horn is =
bad internally.
> =20
> It might seem unlikely that the fault is at the horns in both cases, =
but anything is possible.
> Donate: http://www.team.net/donate.html =
<http://www.team.net/donate.html>
> Archive: http://www.team.net/pipermail/mgs =
<http://www.team.net/pipermail/mgs> http://autox.team.net/archive =
<http://autox.team.net/archive>
> Unsubscribe: =
http://autox.team.net/mailman/options/mgs/[email-masked] =
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> Archive: http://www.team.net/pipermail/mgs =
http://autox.team.net/archive
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<html><head><meta http-equiv=3D"Content-Type" content=3D"text/html; =
charset=3Dutf-8"></head><body style=3D"word-wrap: break-word; =
-webkit-nbsp-mode: space; line-break: after-white-space;" class=3D"">That =
doesn=E2=80=99t seem to be correct. There should be two horns, and they =
should be mounted further forward, toward the bonnet latch platform, one =
on ether side. That is also not the original type of horn.<div =
class=3D""><br class=3D""></div><div class=3D"">I am sure you can find a =
drawing showing this in either the Bentley manual or the Moss Motors =
catalog.<br class=3D""><div class=3D""><br class=3D""></div><div =
class=3D"">You can tell that the horn wire is being stretched to reach =
the current location.</div><div class=3D""><br class=3D""><div class=3D"">=

<div style=3D"color: rgb(0, 0, 0); letter-spacing: normal; text-align: =
start; text-indent: 0px; text-transform: none; white-space: normal; =
word-spacing: 0px; -webkit-text-stroke-width: 0px; word-wrap: =
break-word; -webkit-nbsp-mode: space; -webkit-line-break: =
after-white-space;" class=3D""><div style=3D"color: rgb(0, 0, 0); =
letter-spacing: normal; text-align: start; text-indent: 0px; =
text-transform: none; white-space: normal; word-spacing: 0px; =
-webkit-text-stroke-width: 0px; word-wrap: break-word; =
-webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" =
class=3D""><div style=3D"margin: 0px; font-size: 13px;" =
class=3D"">--</div><div style=3D"margin: 0px; font-size: 13px; =
min-height: 16px;" class=3D"">Max Heim</div><div style=3D"margin: 0px; =
font-size: 13px;" class=3D"">'66 MGB</div></div></div>
</div>

<div><br class=3D""><blockquote type=3D"cite" class=3D""><div =
class=3D"">On Aug 10, 2021, at 10:01 AM, Michael MacLean &lt;<a =
href=3D"mailto:[email-masked]" =
class=3D"">[email-masked]</a>&gt; wrote:</div><br =
class=3D"Apple-interchange-newline"><div class=3D""><div dir=3D"ltr" =
class=3D""><div class=3D"">Speaking of horns, my 1969 MGB GT has only =
one horn.&nbsp; Is that original?&nbsp; It has two wires going to =
it.&nbsp; It works OK, but it just sounds weak.&nbsp; What is a good =
alternative?&nbsp; Can I wire two horns here?</div><div class=3D"">Mike =
MacLean<br class=3D""></div></div><br class=3D""><div =
class=3D"gmail_quote"><div dir=3D"ltr" class=3D"gmail_attr">On Tue, Aug =
10, 2021 at 2:49 AM PaulHunt73 &lt;<a =
href=3D"mailto:[email-masked]" =
class=3D"">[email-masked]</a>&gt; wrote:<br =
class=3D""></div><blockquote class=3D"gmail_quote" style=3D"margin:0px =
0px 0px 0.8ex;border-left:1px solid =
rgb(204,204,204);padding-left:1ex"><u class=3D""></u>

<div style=3D"overflow-wrap: break-word;" bgcolor=3D"#ffffff" =
lang=3D"EN-US" class=3D"">
<div class=3D"">The horn wiring changed on late model cars so that the =
stalk button puts=20
out 12v to the horns, and the horns only have one wire each as they pick =
up an=20
earth from their mountings.</div>
<div class=3D"">&nbsp;</div>
<div class=3D"">As such the horn push should have purple (12v, fused =
always live) and=20
purple/black (to the horn) wires.&nbsp; First thing to check is, does =
the=20
interior light work? If not maybe the purple supply from the fusebox has =
failed,=20
bottom fuse.</div>
<div class=3D"">&nbsp;</div>
<div class=3D"">If so, with it lit press the horn button.&nbsp; Does it =
go out?&nbsp; If so=20
then there is a bad connection back through the fusebox.</div>
<div class=3D"">&nbsp;</div>
<div class=3D"">Next it depends on whether it is easier for you to check =
the wiring at the=20
multi-plug by the column, or at the horns.&nbsp; In the former case look =
for the=20
purple and purple black wires and check them (connector still plugged =
together)=20
for 12v on the purple all the time, and on the purple/black when the =
button is=20
pushed.&nbsp; If on the purple but not the purple/black the switch or =
wiring in=20
the stalk is faulty.&nbsp; Sometimes the wires are moulded into the =
connector=20
blocks so you can only test by parting the connectors just enough to =
expose the=20
pins, but they are still making contact.</div>
<div class=3D"">&nbsp;</div>
<div class=3D"">At the horns with the button pressed you should have 12v =
on the=20
purple/black&nbsp;spades on the horns (wiring connected).&nbsp; If not =
and the=20
test at the column multi-plug was good then the circuit back to there is =
faulty,=20
most likely is a bad connection between the wiring connector and horn=20
spade.</div>
<div class=3D"">&nbsp;</div>
<div class=3D"">If you see 12v on the horn spade&nbsp;check a clean part =
of the horn body=20
for 12v as well. If you see that then the horn earthing is bad.&nbsp; If =
you saw=20
12v on the purple/black spade but not on the body then the horn is bad=20=

internally.</div>
<div class=3D"">&nbsp;</div>
<div class=3D"">It might seem unlikely that the fault is at the horns in =
both cases, but=20
anything is possible.</div>
<div class=3D"">&nbsp;</div>
<div class=3D"">BTW stuff the trumpets with&nbsp;rags to avoid getting a =
loud blast if you=20
disturb the fault and one or other should suddenly start working =
:o)</div>
<div class=3D"">&nbsp;</div>
<div class=3D"">PaulH</div>
<blockquote style=3D"border-left:2px solid =
rgb(0,0,0);padding-left:5px;padding-right:0px;margin-left:5px;margin-right=
:0px" class=3D"">
  <div style=3D"font:10pt arial" class=3D"">----- Original Message ----- =
</div>
  <div class=3D""><br class=3D""></div>
  <div class=3D"gmail-m_-4576391806103799009WordSection1"><p =
class=3D"MsoNormal">We=E2=80=99re working on a 1980 B with a maddening =
assortment of=20
  electrical problems.&nbsp; Right now we=E2=80=99re trying to figure =
out why the horn=20
  push won=E2=80=99t work=E2=80=94and all the wiring diagrams (Bentley =
&amp; Advance=20
  Autowire)=E2=80=94show the horn as having purple wiring=E2=80=94apparent=
ly meant for the&nbsp;=20
  horn push in the steering wheel button, not the =
push-in-the-wiper-stalk of=20
  this car.&nbsp; Any advice from the List?</p></div></blockquote></div>
_______________________________________________<br class=3D"">
<br class=3D"">
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class=3D"">[email-masked]</a><br class=3D"">
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class=3D"">
<br class=3D"">
Archive: <a href=3D"http://www.team.net/pipermail/mgs" rel=3D"noreferrer" =
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Unsubscribe: <a =
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.com</a><br class=3D"">
</blockquote></div>
<img class=3D"" apple-inline=3D"yes" =
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id=3D"B180A278-9C54-489D-AEE1-C6947884F615" =
src=3D"cid:f_ks6b8nct1">_______________________________________________<br=
 class=3D""><br class=3D""><a href=3D"mailto:[email-masked]" =
class=3D"">[email-masked]</a><br class=3D"">Donate: =
&nbsp;$12.75<br class=3D""><br class=3D"">Archive: =
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--Apple-Mail=_06047716-B969-43DD-9E01-252AD4447783
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[email-masked]

--===============8347780174150666699==--

---

From: "dave" <[email-masked]>
Date: Tue, 10 Aug 2021 16:42:46 -0500

This is a multipart message in MIME format.

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Get a pair of horns from any flaps

=20

From: Mgs <[email-masked]> On Behalf Of Michael MacLean
Sent: Tuesday, August 10, 2021 12:01 PM
To: PaulHunt73 <[email-masked]>; [email-masked]
Subject: Re: [Mgs] 1980 MGB wiring question

=20

Speaking of horns, my 1969 MGB GT has only one horn.  Is that original?  =
It has two wires going to it.  It works OK, but it just sounds weak.  =
What is a good alternative?  Can I wire two horns here?

Mike MacLean

=20

=20

=20

=20

=20

=20

=20

=20

=20

PaulH

=20

Unsubscribe: =

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<html xmlns:v=3D"urn:schemas-microsoft-com:vml" =
xmlns:o=3D"urn:schemas-microsoft-com:office:office" =
xmlns:w=3D"urn:schemas-microsoft-com:office:word" =
xmlns:m=3D"http://schemas.microsoft.com/office/2004/12/omml" =
xmlns=3D"http://www.w3.org/TR/REC-html40"><head><meta =
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<o:idmap v:ext=3D"edit" data=3D"1" />
</o:shapelayout></xml><![endif]--></head><body lang=3DEN-US link=3Dblue =
vlink=3Dpurple style=3D'word-wrap:break-word'><div =
class=3DWordSection1><p class=3DMsoNormal>Get a pair of horns from any =
flaps<o:p></o:p></p><p class=3DMsoNormal><o:p>&nbsp;</o:p></p><div =
style=3D'border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0in =
0in 0in'><p class=3DMsoNormal><b>From:</b> Mgs =
&lt;[email-masked]&gt; <b>On Behalf Of </b>Michael =
MacLean<br><b>Sent:</b> Tuesday, August 10, 2021 12:01 PM<br><b>To:</b> =
PaulHunt73 &lt;[email-masked]&gt;; =
[email-masked]<br><b>Subject:</b> Re: [Mgs] 1980 MGB wiring =
question<o:p></o:p></p></div><p =
class=3DMsoNormal><o:p>&nbsp;</o:p></p><div><div><p =
class=3DMsoNormal>Speaking of horns, my 1969 MGB GT has only one =
horn.&nbsp; Is that original?&nbsp; It has two wires going to it.&nbsp; =
It works OK, but it just sounds weak.&nbsp; What is a good =
alternative?&nbsp; Can I wire two horns =
here?<o:p></o:p></p></div><div><p class=3DMsoNormal>Mike =
MacLean<o:p></o:p></p></div></div><p =
class=3DMsoNormal><o:p>&nbsp;</o:p></p><div><div><p class=3DMsoNormal>On =
Tue, Aug 10, 2021 at 2:49 AM PaulHunt73 &lt;<a =
href=3D"mailto:[email-masked]">[email-masked]</a>=
&gt; wrote:<o:p></o:p></p></div><blockquote =
style=3D'border:none;border-left:solid #CCCCCC 1.0pt;padding:0in 0in 0in =
6.0pt;margin-left:4.8pt;margin-right:0in'><div><div><p =
class=3DMsoNormal>The horn wiring changed on late model cars so that the =
stalk button puts out 12v to the horns, and the horns only have one wire =
each as they pick up an earth from their =
mountings.<o:p></o:p></p></div><div><p =
class=3DMsoNormal>&nbsp;<o:p></o:p></p></div><div><p =
class=3DMsoNormal>As such the horn push should have purple (12v, fused =
always live) and purple/black (to the horn) wires.&nbsp; First thing to =
check is, does the interior light work? If not maybe the purple supply =
from the fusebox has failed, bottom fuse.<o:p></o:p></p></div><div><p =
class=3DMsoNormal>&nbsp;<o:p></o:p></p></div><div><p =
class=3DMsoNormal>If so, with it lit press the horn button.&nbsp; Does =
it go out?&nbsp; If so then there is a bad connection back through the =
fusebox.<o:p></o:p></p></div><div><p =
class=3DMsoNormal>&nbsp;<o:p></o:p></p></div><div><p =
class=3DMsoNormal>Next it depends on whether it is easier for you to =
check the wiring at the multi-plug by the column, or at the horns.&nbsp; =
In the former case look for the purple and purple black wires and check =
them (connector still plugged together) for 12v on the purple all the =
time, and on the purple/black when the button is pushed.&nbsp; If on the =
purple but not the purple/black the switch or wiring in the stalk is =
faulty.&nbsp; Sometimes the wires are moulded into the connector blocks =
so you can only test by parting the connectors just enough to expose the =
pins, but they are still making contact.<o:p></o:p></p></div><div><p =
class=3DMsoNormal>&nbsp;<o:p></o:p></p></div><div><p =
class=3DMsoNormal>At the horns with the button pressed you should have =
12v on the purple/black&nbsp;spades on the horns (wiring =
connected).&nbsp; If not and the test at the column multi-plug was good =
then the circuit back to there is faulty, most likely is a bad =
connection between the wiring connector and horn =
spade.<o:p></o:p></p></div><div><p =
class=3DMsoNormal>&nbsp;<o:p></o:p></p></div><div><p =
class=3DMsoNormal>If you see 12v on the horn spade&nbsp;check a clean =
part of the horn body for 12v as well. If you see that then the horn =
earthing is bad.&nbsp; If you saw 12v on the purple/black spade but not =
on the body then the horn is bad internally.<o:p></o:p></p></div><div><p =
class=3DMsoNormal>&nbsp;<o:p></o:p></p></div><div><p =
class=3DMsoNormal>It might seem unlikely that the fault is at the horns =
in both cases, but anything is possible.<o:p></o:p></p></div><div><p =
class=3DMsoNormal>&nbsp;<o:p></o:p></p></div><div><p =
class=3DMsoNormal>BTW stuff the trumpets with&nbsp;rags to avoid getting =
a loud blast if you disturb the fault and one or other should suddenly =
start working :o)<o:p></o:p></p></div><div><p =
class=3DMsoNormal>&nbsp;<o:p></o:p></p></div><div><p =
class=3DMsoNormal>PaulH<o:p></o:p></p></div><blockquote =
style=3D'border:none;border-left:solid black 1.5pt;padding:0in 0in 0in =
4.0pt;margin-left:3.75pt;margin-top:5.0pt;margin-right:0in;margin-bottom:=
5.0pt'><div><p class=3DMsoNormal><span =
style=3D'font-size:10.0pt;font-family:"Arial",sans-serif'>----- Original =
Message ----- <o:p></o:p></span></p></div><div><p =
class=3DMsoNormal><o:p>&nbsp;</o:p></p></div><div><p class=3DMsoNormal =
style=3D'mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'>We=E2=80=99r=
e working on a 1980 B with a maddening assortment of electrical =
problems.&nbsp; Right now we=E2=80=99re trying to figure out why the =
horn push won=E2=80=99t work=E2=80=94and all the wiring diagrams =
(Bentley &amp; Advance Autowire)=E2=80=94show the horn as having purple =
wiring=E2=80=94apparently meant for the&nbsp; horn push in the steering =
wheel button, not the push-in-the-wiper-stalk of this car.&nbsp; Any =
advice from the List?<o:p></o:p></p></div></blockquote></div><p =
class=3DMsoNormal>_______________________________________________<br><br>=
<a href=3D"mailto:[email-masked]" =
target=3D"_blank">[email-masked]</a><br>Donate: <a =
href=3D"http://www.team.net/donate.html" =
target=3D"_blank">http://www.team.net/donate.html</a><br>Suggested =
annual donation&nbsp; $12.75<br><br>Archive: <a =
href=3D"http://www.team.net/pipermail/mgs" =
target=3D"_blank">http://www.team.net/pipermail/mgs</a> <a =
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target=3D"_blank">http://autox.team.net/archive</a><br><br>Unsubscribe: =
<a =
href=3D"http://autox.team.net/mailman/options/mgs/[email-masked]=
om" =
target=3D"_blank">http://autox.team.net/mailman/options/mgs/springer.mike=
[email-masked]</a><o:p></o:p></p></blockquote></div></div></body></html>
------=_NextPart_000_0017_01D78E06.BFAA5C80--

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[email-masked]

--===============8633281373404750674==--

---

From: Robert's New iPad <[email-masked]>
Date: Tue, 10 Aug 2021 18:53:38 -0400

--===============7587251079257039104==
	boundary=Apple-Mail-0EEBBBEA-52EA-4CC4-87C5-82EDDD18CCE6
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	charset=utf-8
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   It was sent to USA with two horns. Home market might have had only one. P=
aul will know.
   The most frequent cause of horn weakness is defective grounding, followed=
 by poor connections in power supply.    =20
   Chase and check all the wires and connections.    Horns draw a fierce cur=
rent, so good connections are important.=20
Bob

> On Aug 10, 2021, at 1:01 PM, Michael MacLean <[email-masked]> w=
rote:
>=20
> Speaking of horns, my 1969 MGB GT has only one horn.  Is that original?  I=
t has two wires going to it.  It works OK, but it just sounds weak.  What is=
 a good alternative?  Can I wire two horns here?
> Mike MacLean
>=20
>> On Tue, Aug 10, 2021 at 2:49 AM PaulHunt73 <[email-masked]> w=
rote:
>> The horn wiring changed on late model cars so that the stalk button puts o=
ut 12v to the horns, and the horns only have one wire each as they pick up a=
n earth from their mountings.
>> =20
>> As such the horn push should have purple (12v, fused always live) and pur=
ple/black (to the horn) wires.  First thing to check is, does the interior l=
ight work? If not maybe the purple supply from the fusebox has failed, botto=
m fuse.
>> =20
>> If so, with it lit press the horn button.  Does it go out?  If so then th=
ere is a bad connection back through the fusebox.
>> Next it depends on whether it is easier for you to check the wiring at th=
e multi-plug by the column, or at the horns.  In the former case look for th=
e purple and purple black wires and check them (connector still plugged toge=
ther) for 12v on the purple all the time, and on the purple/black when the b=
utton is pushed.  If on the purple but not the purple/black the switch or wi=
ring in the stalk is faulty.  Sometimes the wires are moulded into the conne=
ctor  blocks so you can only test by parting the connectors just enough to e=
xpose the pins, but they are still making contact.
>> =20
>> At the horns with the button pressed you should have 12v on the purple/bl=
ack spades on the horns (wiring connected).  If not and the test at the colu=
mn multi-plug was good then the circuit back to there is faulty, most likely=
 is a bad connection between the wiring connector and horn spade.
>> =20
>> If you see 12v on the horn spade check a clean part of the horn body for 1=
2v as well. If you see that then the horn earthing is bad.  If you saw 12v o=
n the purple/black spade but not on the body then the horn is bad internally=
.
>> =20
>> It might seem unlikely that the fault is at the horns in both cases, but a=
nything is possible.
>> =20
>> BTW stuff the trumpets with rags to avoid getting a loud blast if you dis=
turb the fault and one or other should suddenly start working :o)
>> We=E2=80=99re working on a 1980 B with a maddening assortment of electric=
al problems.  Right now we=E2=80=99re trying to figure out why the horn push=
 won=E2=80=99t work=E2=80=94and all the wiring diagrams (Bentley & Advance A=
utowire)=E2=80=94show the horn as having purple wiring=E2=80=94apparently me=
ant for the  horn push in the steering wheel button, not the push-in-the-wip=
er-stalk of    this car.  Any advice from the List?
>> Unsubscribe: http://autox.team.net/mailman/options/mgs/springer.mike51@gm=
ail.com
> <MG Horn1.jpg>
> <MGB GT Waxed.jpg>
> Unsubscribe: http://autox.team.net/mailman/options/mgs/[email-masked]

--Apple-Mail-0EEBBBEA-52EA-4CC4-87C5-82EDDD18CCE6
	charset=utf-8
Content-Transfer-Encoding: quoted-printable

<html><head><meta http-equiv=3D"content-type" content=3D"text/html; charset=3D=
utf-8"></head><body dir=3D"auto"><div dir=3D"ltr"></div><div dir=3D"ltr">&nb=
sp; &nbsp;It was sent to USA with two horns. Home market might have had only=
 one. Paul will know.</div><div dir=3D"ltr">&nbsp; &nbsp;The most frequent c=
ause of horn weakness is defective grounding, followed by poor connections i=
n power supply. &nbsp; &nbsp;&nbsp;</div><div dir=3D"ltr">&nbsp; &nbsp;Chase=
 and check all the wires and connections. &nbsp; &nbsp;Horns draw a fierce c=
urrent, so good connections are important.&nbsp;</div><div dir=3D"ltr">Bob</=
div><div dir=3D"ltr"><br></div><div dir=3D"ltr"><br>On Aug 10, 2021, at 1:01=
 PM, Michael MacLean &lt;<a href=3D"mailto:[email-masked]">spring=
[email-masked]</a>&gt; wrote:<br><br></div><blockquote type=3D"cite"><d=
iv dir=3D"ltr"><div dir=3D"ltr"><div>Speaking of horns, my 1969 MGB GT has o=
nly one horn.&nbsp; Is that original?&nbsp; It has two wires going to it.&nb=
sp; It works OK, but it just sounds weak.&nbsp; What is a good alternative?&=
nbsp; Can I wire two horns here?</div><div>Mike MacLean<br></div></div><br><=
div class=3D"gmail_quote"><div dir=3D"ltr" class=3D"gmail_attr">On Tue, Aug 1=
0, 2021 at 2:49 AM PaulHunt73 &lt;<a href=3D"mailto:[email-masked]=
om">[email-masked]</a>&gt; wrote:<br></div><blockquote class=3D"=
gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204=
,204,204);padding-left:1ex"><u></u>

<div style=3D"overflow-wrap: break-word;" bgcolor=3D"#ffffff" lang=3D"EN-US"=
<div>The horn wiring changed on late model cars so that the stalk button put=
s=20
out 12v to the horns, and the horns only have one wire each as they pick up a=
n=20
earth from their mountings.</div>
<div>&nbsp;</div>
<div>As such the horn push should have purple (12v, fused always live) and=20=

purple/black (to the horn) wires.&nbsp; First thing to check is, does the=20=

interior light work? If not maybe the purple supply from the fusebox has fai=
led,=20
bottom fuse.</div>
<div>&nbsp;</div>
<div>If so, with it lit press the horn button.&nbsp; Does it go out?&nbsp; I=
f so=20
then there is a bad connection back through the fusebox.</div>
<div>&nbsp;</div>
<div>Next it depends on whether it is easier for you to check the wiring at t=
he=20
multi-plug by the column, or at the horns.&nbsp; In the former case look for=
 the=20
purple and purple black wires and check them (connector still plugged togeth=
er)=20
for 12v on the purple all the time, and on the purple/black when the button i=
s=20
pushed.&nbsp; If on the purple but not the purple/black the switch or wiring=
 in=20
the stalk is faulty.&nbsp; Sometimes the wires are moulded into the connecto=
r=20
blocks so you can only test by parting the connectors just enough to expose t=
he=20
pins, but they are still making contact.</div>
<div>&nbsp;</div>
<div>At the horns with the button pressed you should have 12v on the=20
purple/black&nbsp;spades on the horns (wiring connected).&nbsp; If not and t=
he=20
test at the column multi-plug was good then the circuit back to there is fau=
lty,=20
most likely is a bad connection between the wiring connector and horn=20
spade.</div>
<div>&nbsp;</div>
<div>If you see 12v on the horn spade&nbsp;check a clean part of the horn bo=
dy=20
for 12v as well. If you see that then the horn earthing is bad.&nbsp; If you=
 saw=20
12v on the purple/black spade but not on the body then the horn is bad=20
internally.</div>
<div>&nbsp;</div>
<div>It might seem unlikely that the fault is at the horns in both cases, bu=
t=20
anything is possible.</div>
<div>&nbsp;</div>
<div>BTW stuff the trumpets with&nbsp;rags to avoid getting a loud blast if y=
ou=20
disturb the fault and one or other should suddenly start working :o)</div>
<div>&nbsp;</div>
<div>PaulH</div>
<blockquote style=3D"border-left:2px solid rgb(0,0,0);padding-left:5px;paddi=
ng-right:0px;margin-left:5px;margin-right:0px">
  <div style=3D"font:10pt arial">----- Original Message ----- </div>
  <div><br></div>
  <div class=3D"gmail-m_-4576391806103799009WordSection1">
  <p class=3D"MsoNormal">We=E2=80=99re working on a 1980 B with a maddening a=
ssortment of=20
  electrical problems.&nbsp; Right now we=E2=80=99re trying to figure out wh=
y the horn=20
  push won=E2=80=99t work=E2=80=94and all the wiring diagrams (Bentley &amp;=
 Advance=20
  Autowire)=E2=80=94show the horn as having purple wiring=E2=80=94apparently=
 meant for the&nbsp;=20
  horn push in the steering wheel button, not the push-in-the-wiper-stalk of=
=20
  this car.&nbsp; Any advice from the List?</p></div></blockquote></div>
_______________________________________________<br>
<br>
<a href=3D"mailto:[email-masked]" target=3D"_blank">[email-masked]</=
a><br>
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[email-masked]

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---

From: "PaulHunt73" <[email-masked]>
Date: Wed, 11 Aug 2021 14:22:57 +0100 0PEgA0/6WdBBflC9tUFuq54+l30hWoTr5aCB2JsrMFPrCg9DCR4Vddp9CUVWBW6aSHGTe2Bk+YIqcHCMIVfdAXJFNBGvkXM1EbstJUpLp4eYZxYwDocmUuGb

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Clausager and BL documents imply that the UK only had twin horns from =
1970, North America with the Mk2.  Originally there was a sub-harness =
from the right-hand to the left-hand horn, the main harness probably =
contained the wiring for both from 1970.  It/they moved from the slam =
panel to the inner wing in 1963.

The earth path to the horn push is pretty awful, no allowance for =
electrical conductivity in the chassis/crossmember/rack/UJ/column =
assembly unlike a pal's TR4 that has a braided strap from the chassis to =
the rack and another round the UJ.  In which case a PO may have removed =
the 2nd horn as it would double the load and make things even worse if =
connections are weak.  My V8 came to me with a single moped horn, I had =
to add a relay before the correct horns would work at all even one.  =
Subsequently I had to add one to the roadster as well.  The standard =
horns with good electrical conductivity are pretty powerful.

If you put a voltmeter between the purple terminal at the horns and the =
body and push the button you will see how much voltage you are losing =
through the fuse (if any) by the voltage dropping from 12v.  Do the same =
on the purple/black and the higher that is above zero shows how much you =
are losing through the earth path.

PaulH.

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=EF=BB=BF<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML><HEAD>
<META content=3D"text/html; charset=3Dutf-8" http-equiv=3DContent-Type>
<META name=3DGENERATOR content=3D"MSHTML 8.00.6001.23588">
<STYLE></STYLE>
</HEAD>
<BODY bgColor=3D#ffffff>
<DIV>Clausager and BL documents imply that the UK only had twin =
horns&nbsp;from=20
1970, North America with the Mk2.&nbsp; Originally there was a =
sub-harness from=20
the right-hand to the&nbsp;left-hand horn, the main harness probably =
contained=20
the wiring for both from 1970.&nbsp; It/they moved from the slam panel =
to the=20
inner wing in 1963.</DIV>
<DIV>&nbsp;</DIV>
<DIV>The earth path to the horn push is pretty awful, no allowance for=20
electrical conductivity in the chassis/crossmember/rack/UJ/column =
assembly=20
unlike a pal's TR4 that has a braided strap from the chassis to the rack =
and=20
another round the UJ.&nbsp; In which case a PO may have removed the 2nd =
horn as=20
it would double the load and make things even worse if connections are=20
weak.&nbsp; My V8 came to me with a single moped horn, I had to add a =
relay=20
before the correct horns would work at all even one.&nbsp; Subsequently =
I had to=20
add one to the roadster as well.&nbsp; The standard horns with good =
electrical=20
conductivity are pretty powerful.</DIV>
<DIV>&nbsp;</DIV>
<DIV>If you put a voltmeter between the purple terminal at the =
horns&nbsp;and=20
the body and push the button you will see how much voltage you are =
losing=20
through the fuse (if any) by the voltage dropping from 12v.&nbsp; Do the =
same on=20
the purple/black and the higher that is above zero shows how much you =
are losing=20
through the earth path.</DIV>
<DIV>&nbsp;</DIV>
<DIV>PaulH.</DIV>
<DIV>&nbsp;</DIV>
<DIV>----- Original Message ----- </DIV>
<BLOCKQUOTE=20
style=3D"BORDER-LEFT: #000000 2px solid; PADDING-LEFT: 5px; =
PADDING-RIGHT: 0px; MARGIN-LEFT: 5px; MARGIN-RIGHT: 0px"=20
dir=3Dltr>
  <DIV><BR></DIV>
  <DIV dir=3Dltr>
  <DIV>Speaking of horns, my 1969 MGB GT has only one horn.&nbsp; Is =
that=20
  original?&nbsp; It has two wires going to it.&nbsp; It works OK, but =
it just=20
  sounds weak.&nbsp; What is a good alternative?&nbsp; Can I wire two =
horns=20
  here?</DIV>
  <DIV>Mike MacLean<BR></DIV></DIV>
  <DIV class=3Dgmail_quote>
  <BLOCKQUOTE=20
  style=3D"BORDER-LEFT: rgb(204,204,204) 1px solid; MARGIN: 0px 0px 0px =
0.8ex; PADDING-LEFT: 1ex"=20
  =
class=3Dgmail_quote>&nbsp;</BLOCKQUOTE></DIV></BLOCKQUOTE></BODY></HTML>

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[email-masked]

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