Subject: [Mgs] B/GT electrical problems

From: S.Carr <[email-masked]>
Date: Fri, 9 Apr 2021 11:29:59 -0400

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#1 =E2=80=93 tachometer =E2=80=93 after working sporadically, the tach in m=
y =E2=80=9971 B/GT has finally quit completely.
#2 =E2=80=93 temperature gauge =E2=80=93 until we started it up this spring=
, the gauge has never been above =E2=80=9CN=E2=80=9D (except for one long u=
phill crawl with a loose fan belt).  Now, after only a few minutes at idle,=
 it went rapidly to =E2=80=9CH=E2=80=9D.

Would either of these problems be due to a problem with the gauge voltage s=
tabilizer?  The wiring diagram shows wires going from both of these gauges =
to the stabilizer.  I have a vague memory of having a stabilizer fail years=
 ago, and some of the gauges not working thereafter, but I don=E2=80=99t re=
member which ones it was.  Wisdom of the List?

Thanks in advance,
Sarah Carr
=E2=80=9971 B/GT in PA

Sent from Mail for Windows 10

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'word-wrap:break-word'><div class=3DWordSection1><p class=3DMsoNormal>#1 =
=E2=80=93 tachometer =E2=80=93 after working sporadically, the tach in my =
=E2=80=9971 B/GT has finally quit completely.</p><p class=3DMsoNormal>#2 =
=E2=80=93 temperature gauge =E2=80=93 until we started it up this spring, t=
he gauge has never been above =E2=80=9CN=E2=80=9D (except for one long uphi=
ll crawl with a loose fan belt).=C2=A0 Now, after only a few minutes at idl=
e, it went rapidly to =E2=80=9CH=E2=80=9D.</p><p class=3DMsoNormal><o:p>&nb=
sp;</o:p></p><p class=3DMsoNormal>Would either of these problems be due to =
a problem with the gauge voltage stabilizer? =C2=A0The wiring diagram shows=
 wires going from both of these gauges to the stabilizer. =C2=A0I have a va=
gue memory of having a stabilizer fail years ago, and <u>some</u> of the ga=
uges not working thereafter, but I don=E2=80=99t remember which ones it was=
.=C2=A0 Wisdom of the List?</p><p class=3DMsoNormal><o:p>&nbsp;</o:p></p><p=
 class=3DMsoNormal>Thanks in advance,</p><p class=3DMsoNormal>Sarah Carr</p=
><p class=3DMsoNormal>=E2=80=9971 B/GT in PA</p><p class=3DMsoNormal><o:p>&=
nbsp;</o:p></p><p class=3DMsoNormal>Sent from <a href=3D"https://go.microso=
ft.com/fwlink/?LinkId=3D550986">Mail</a> for Windows 10</p><p class=3DMsoNo=
rmal><o:p>&nbsp;</o:p></p></div></body></html>=

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_______________________________________________

[email-masked]

Archive: http://www.team.net/pipermail/mgs http://autox.team.net/archive

Unsubscribe: http://autox.team.net/mailman/options/mgs/[email-masked]

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From: John DiFede <[email-masked]>
Date: Fri, 9 Apr 2021 12:30:05 -0400

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Sarah. The voltage stabilizer sends reduced voltage to the fuel and temp gau=
ges.  The temp gauge going up to H may be a wiring problem.  If the wire to t=
he temp sending unit is grounded that could cause the gauge to read H.=20
 The tach not working may be a different problem. =20

Sent from my iPhone

> On Apr 9, 2021, at 11:37 AM, S.Carr <[email-masked]> wrote:
>=20
> =EF=BB=BF
> #2 =E2=80=93 temperature gauge =E2=80=93 until we started it up this sprin=
g, the gauge has never been above =E2=80=9CN=E2=80=9D (except for one long u=
phill crawl with a loose fan belt).  Now, after only a few minutes at idle, i=
t went rapidly to =E2=80=9CH=E2=80=9D.
> =20
tabilizer?  The wiring diagram shows wires going from both of these gauges t=
o the stabilizer.  I have a vague memory of having a stabilizer fail years a=
go, and some of the gauges not working thereafter, but I don=E2=80=99t remem=
ber which ones it was.  Wisdom of the List?
> =20
> =20
> =20
>=20
> Donate: http://www.team.net/donate.html
> Suggested annual donation  $12.75
>=20
>=20
> Unsubscribe: http://autox.team.net/mailman/options/mgs/[email-masked]

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<html><head><meta http-equiv=3D"content-type" content=3D"text/html; charset=3D=
utf-8"></head><body dir=3D"auto">Sarah. The voltage stabilizer sends reduced=
 voltage to the fuel and temp gauges. &nbsp;The temp gauge going up to H may=
 be a wiring problem. &nbsp;If the wire to the temp sending unit is grounded=
 that could cause the gauge to read H.&nbsp;<div>&nbsp;The tach not working m=
ay be a different problem. &nbsp;<br><br><div dir=3D"ltr">Sent from my iPhon=
e</div><div dir=3D"ltr"><br><blockquote type=3D"cite">On Apr 9, 2021, at 11:=
37 AM, S.Carr &lt;[email-masked]&gt; wrote:<br><br></blockquote></div><bl=
ockquote type=3D"cite"><div dir=3D"ltr">=EF=BB=BF<meta http-equiv=3D"Content=
-Type" content=3D"text/html; charset=3Dutf-8"><meta name=3D"Generator" conte=
nt=3D"Microsoft Word 15 (filtered medium)"><style><!--
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--></style><div class=3D"WordSection1"><p class=3D"MsoNormal">#1 =E2=80=93 t=
achometer =E2=80=93 after working sporadically, the tach in my =E2=80=9971 B=
/GT has finally quit completely.</p><p class=3D"MsoNormal">#2 =E2=80=93 temp=
erature gauge =E2=80=93 until we started it up this spring, the gauge has ne=
ver been above =E2=80=9CN=E2=80=9D (except for one long uphill crawl with a l=
oose fan belt).&nbsp; Now, after only a few minutes at idle, it went rapidly=
 to =E2=80=9CH=E2=80=9D.</p><p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p><p c=
lass=3D"MsoNormal">Would either of these problems be due to a problem with t=
he gauge voltage stabilizer? &nbsp;The wiring diagram shows wires going from=
 both of these gauges to the stabilizer. &nbsp;I have a vague memory of havi=
ng a stabilizer fail years ago, and <u>some</u> of the gauges not working th=
ereafter, but I don=E2=80=99t remember which ones it was.&nbsp; Wisdom of th=
e List?</p><p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p><p class=3D"MsoNormal=
">Thanks in advance,</p><p class=3D"MsoNormal">Sarah Carr</p><p class=3D"Mso=
Normal">=E2=80=9971 B/GT in PA</p><p class=3D"MsoNormal"><o:p>&nbsp;</o:p></=
p><p class=3D"MsoNormal">Sent from <a href=3D"https://go.microsoft.com/fwlin=
k/?LinkId=3D550986">Mail</a> for Windows 10</p><p class=3D"MsoNormal"><o:p>&=
nbsp;</o:p></p></div><span>_______________________________________________</=
span><br><span></span><br><span>[email-masked]</span><br><span>Donate: h=
ttp://www.team.net/donate.html</span><br><span>Suggested annual donation &nb=
sp;$12.75</span><br><span></span><br><span>Archive: http://www.team.net/pipe=
rmail/mgs http://autox.team.net/archive</span><br><span></span><br><span>Uns=
ubscribe: http://autox.team.net/mailman/options/mgs/[email-masked]</span>=
<br></div></blockquote></div></body></html>=

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[email-masked]

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From: Robert's New iPad <[email-masked]>
Date: Fri, 9 Apr 2021 12:55:47 -0400

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  The line voltage stabiliser is common to both Tach and Fuel gauge, and is a=
lways suspect. They do, however, tend to last many years (unless they don=E2=
=80=99t). =20
   What I would do first is to ensure that both wires on the coil are secure=
. One excites the tach, and if the connection is dodgy the tach can be errat=
ic.  Also check the fuses, as they are frequent suspects too, though unlikel=
y in this case.  Loosen, then tighten, the screw securing the stabiliser to t=
he bulkhead. Good connection for earthing is important. =20
   WIth an old-style, needle-type analogue voltmeter, check the output volta=
ge of the stabiliser. Awkward to get at, but it must be tested in the car. V=
oltage will vary, if it is the original points-type stabiliser, swinging the=
 needle up and down the scale, but you are looking for a mid-point average o=
f 10V.  If yours is the newer type, electronic, it should be steady at 10V. =
=20
   Because the temp jumped as it did, I would recommend that you also use an=
 infrared thermometer to check actual temp at the thermostat.  They can fail=
 unpredictably.
Bob

> On Apr 9, 2021, at 11:29 AM, S.Carr <[email-masked]> wrote:
>=20
> Unsubscribe: http://autox.team.net/mailman/options/mgs/[email-masked]

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<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; The line voltage stabiliser is common to both Tach and Fuel gauge, and i=
s always suspect. They do, however, tend to last many years (unless they don=
=E2=80=99t). &nbsp;</div><div dir=3D"ltr">&nbsp; &nbsp;What I would do first=
 is to ensure that both wires on the coil are secure. One excites the tach, a=
nd if the connection is dodgy the tach can be erratic. &nbsp;Also check the f=
uses, as they are frequent suspects too, though unlikely in this case. &nbsp=
;Loosen, then tighten, the screw securing the stabiliser to the bulkhead. Go=
od connection for earthing is important. &nbsp;</div><div dir=3D"ltr">&nbsp;=
 &nbsp;WIth an old-style, needle-type analogue voltmeter, check the output v=
oltage of the stabiliser. Awkward to get at, but it must be tested in the ca=
r. Voltage will vary, if it is the original points-type stabiliser, swinging=
 the needle up and down the scale, but you are looking for a mid-point avera=
ge of 10V. &nbsp;If yours is the newer type, electronic, it should be steady=
 at 10V. &nbsp;</div><div dir=3D"ltr">&nbsp; &nbsp;Because the temp jumped a=
s it did, I would recommend that you also use an infrared thermometer to che=
ck actual temp at the thermostat. &nbsp;They can fail unpredictably.</div><d=
iv dir=3D"ltr">Bob</div><div dir=3D"ltr"><br></div><div dir=3D"ltr"><br>On A=
pr 9, 2021, at 11:29 AM, S.Carr &lt;<a href=3D"mailto:[email-masked]">bri=
[email-masked]</a>&gt; wrote:<br><br></div><blockquote type=3D"cite"><div di=
r=3D"ltr"><meta http-equiv=3D"Content-Type" content=3D"text/html; charset=3D=
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--></style><div class=3D"WordSection1"><p class=3D"MsoNormal">#1 =E2=80=93 t=
achometer =E2=80=93 after working sporadically, the tach in my =E2=80=9971 B=
/GT has finally quit completely.</p><p class=3D"MsoNormal">#2 =E2=80=93 temp=
erature gauge =E2=80=93 until we started it up this spring, the gauge has ne=
ver been above =E2=80=9CN=E2=80=9D (except for one long uphill crawl with a l=
oose fan belt).&nbsp; Now, after only a few minutes at idle, it went rapidly=
 to =E2=80=9CH=E2=80=9D.</p><p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p><p c=
lass=3D"MsoNormal">Would either of these problems be due to a problem with t=
he gauge voltage stabilizer? &nbsp;The wiring diagram shows wires going from=
 both of these gauges to the stabilizer. &nbsp;I have a vague memory of havi=
ng a stabilizer fail years ago, and <u>some</u> of the gauges not working th=
ereafter, but I don=E2=80=99t remember which ones it was.&nbsp; Wisdom of th=
e List?</p><p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p><p class=3D"MsoNormal=
">Thanks in advance,</p><p class=3D"MsoNormal">Sarah Carr</p><p class=3D"Mso=
Normal">=E2=80=9971 B/GT in PA</p><p class=3D"MsoNormal"><o:p>&nbsp;</o:p></=
p><p class=3D"MsoNormal">Sent from <a href=3D"https://go.microsoft.com/fwlin=
k/?LinkId=3D550986">Mail</a> for Windows 10</p><p class=3D"MsoNormal"><o:p>&=
nbsp;</o:p></p></div></div></blockquote><blockquote type=3D"cite"><div dir=3D=
"ltr"><span>_______________________________________________</span><br><span>=
</span><br><span><a href=3D"mailto:[email-masked]">[email-masked]</a=
></span><br><span>Donate: <a href=3D"http://www.team.net/donate.html">http:/=
/www.team.net/donate.html</a></span><br><span>Suggested annual donation &nbs=
p;$12.75</span><br><span></span><br><span>Archive: <a href=3D"http://www.tea=
m.net/pipermail/mgs">http://www.team.net/pipermail/mgs</a> <a href=3D"http:/=
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From: "PaulHunt73" <[email-masked]>
Date: Sat, 10 Apr 2021 08:58:56 +0100 +2JFPuvF0PJOUCueNYpbmyfBvSO5fRFFEpnX24mfQf3CeOErCrQXTTykGAzT3Jxgpp+LvzvHp+vZ+g==

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The fact that one has been intermittent for a while and the other only =
happened recently implies they are not the same fault.

The voltage stabiliser only supplies power to the fuel and electric temp =
gauges, not the tach.  The confusion with the tach is that the green =
supply to the tach is often daisy chained off the 12v terminal feeding =
the voltage stabiliser.  If all three were failing to register then it =
could be the green supply to the voltage stabiliser (and hence the tach) =
that had failed, other than that they are separate problems.

Because the fuel and electric temp gauges are fed from the voltage =
stabiliser if the stabiliser fails in that it continually supplies =
system voltage to those gauges then they will read high, and will vary =
as system voltage goes up and down.  The simple test for that is to =
switch on the ignition but don't start the engine, and note the fuel =
gauge reading once it has stabilised tapping the gauge with a knuckle =
occasionally.  Then start the engine and get it charging, and if the =
fuel gauge goes up then the stabiliser is faulty.

If the temp gauge started heading for H as soon as you switched on the =
ignition then the blue/green wire to the sender is shorting out.  But if =
it only starts rising once the engine is running it's more like =
something causing excess heat, perhaps low coolant causing boiling, =
other than that the sender may have failed in an unusual way.

If the tach stops working but the engine continues to run then it could =
be a wiring problem or an internal fault.  For the former either loss of =
the 12v or earth supplies to the case, or if anything has changed with =
the ignition coil wiring the power to the coil could be bypassing the =
trigger circuit in the tach.

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

  #1 =E2=80=93 tachometer =E2=80=93 after working sporadically, the tach =
in my =E2=80=9971 B/GT has finally quit completely.

  #2 =E2=80=93 temperature gauge =E2=80=93 until we started it up this =
spring, the gauge has never been above =E2=80=9CN=E2=80=9D (except for =
one long uphill crawl with a loose fan belt).  Now, after only a few =
minutes at idle, it went rapidly to =E2=80=9CH=E2=80=9D.

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vLink=3D#954f72>
<DIV><FONT size=3D2>The fact that one has been intermittent for a while =
and the=20
other only happened recently implies they are not the same =
fault.</FONT></DIV>
<DIV><FONT size=3D2></FONT>&nbsp;</DIV>
<DIV><FONT size=3D2>The voltage stabiliser only supplies power to the =
fuel and=20
electric temp gauges, not the tach.&nbsp; The confusion with the tach is =
that=20
the green supply to the tach is often daisy chained off the 12v terminal =
feeding=20
the voltage stabiliser.&nbsp; If all three were failing to register then =
it=20
could be the green supply to the&nbsp;voltage stabiliser (and hence the =
tach)=20
that had failed, other than that they are separate =
problems.</FONT></DIV>
<DIV><FONT size=3D2></FONT>&nbsp;</DIV>
<DIV><FONT size=3D2>Because the fuel and electric temp gauges are fed =
from the=20
voltage stabiliser if the stabiliser fails in that it continually =
supplies=20
system voltage to those gauges then they will read high, and will vary =
as system=20
voltage goes up and down.&nbsp; The simple test for that is to switch on =
the=20
ignition but don't start the engine, and note the fuel gauge reading =
once it has=20
stabilised tapping the gauge with a knuckle occasionally.&nbsp; Then =
start the=20
engine and get it charging, and if the fuel gauge goes up then the =
stabiliser is=20
faulty.</FONT></DIV>
<DIV><FONT size=3D2></FONT>&nbsp;</DIV>
<DIV><FONT size=3D2>If the temp gauge started heading for H as soon as =
you=20
switched on the ignition then the blue/green wire to the sender is =
shorting=20
out.&nbsp; But if it only starts rising once the engine is running it's =
more=20
like something causing excess heat, perhaps low coolant causing boiling, =
other=20
than that the sender may have failed in an unusual way.</FONT></DIV>
<DIV><FONT size=3D2></FONT>&nbsp;</DIV>
<DIV><FONT size=3D2>If the tach stops working but the engine continues =
to run then=20
it could be a wiring problem or an internal fault.&nbsp; For the former =
either=20
loss of the 12v or earth supplies to the case, or if anything has =
changed with=20
the ignition coil wiring the power to the coil could be bypassing the =
trigger=20
circuit in the tach.</FONT></DIV>
<DIV><FONT size=3D2></FONT>&nbsp;</DIV>
<DIV><FONT size=3D2>PaulH.</FONT></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><FONT size=3D2></FONT><FONT size=3D2></FONT><FONT =
size=3D2></FONT><BR></DIV>
  <DIV class=3DWordSection1>
  <P class=3DMsoNormal>#1 =E2=80=93 tachometer =E2=80=93 after working =
sporadically, the tach in=20
  my =E2=80=9971 B/GT has finally quit completely.</P>
  <P class=3DMsoNormal>#2 =E2=80=93 temperature gauge =E2=80=93 until we =
started it up this=20
  spring, the gauge has never been above =E2=80=9CN=E2=80=9D (except for =
one long uphill crawl=20
  with a loose fan belt).&nbsp; Now, after only a few minutes at idle, =
it went=20
  rapidly to =E2=80=9CH=E2=80=9D.</P></DIV></BLOCKQUOTE></BODY></HTML>

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