Subject: Re: [Mgs] Positive earth

From: PaulHunt73 via Mgs <[email-masked]>
Date: Sat, 17 Aug 2019 08:47:12 +0100 hB+H8kaPJFwwd66AdN4JtrzVqKgSJp9D8qatmbSXg2OpJq6LSVbprnPJh8NMslGdtxkJCT/Pw3nZAg==

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If you have a rev counter i.e. mechanical there will be a thick flexible =
cable like a speedo cable going to the engine.  MGBs got the electronic =
tach in 1964, for what that's worth.

Other than that it depends if you have any other electronic stuff like =
ignition (probably unlikely) or radio.  Radios in a car not touched for =
that long could well have a polarity reversing plug.

The heater fan may reverse and work less well, but if both wires going =
into the motor are the same colour with no identification stripe on one =
of them then probably not.

The wipers may park in a slightly different place.

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

  Other than turning battery around and flashing the voltage regulator, =
are there any concerns with changing my 65 Spridget to negative ground?
  Is tach mechanical or electric?
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<DIV><FONT size=3D2>If you have a rev counter i.e. mechanical there will =
be a=20
thick flexible cable like a speedo cable going to the engine.&nbsp; MGBs =
got the=20
electronic tach in 1964, for what that's worth.</FONT></DIV>
<DIV><FONT size=3D2></FONT>&nbsp;</DIV>
<DIV><FONT size=3D2>Other than that it depends if you have any other =
electronic=20
stuff like ignition (probably unlikely) or radio.&nbsp; Radios in a car =
not=20
touched for that long could well have a polarity reversing =
plug.</FONT></DIV>
<DIV><FONT size=3D2></FONT>&nbsp;</DIV>
<DIV><FONT size=3D2>The heater fan may reverse and work less well, but =
if both=20
wires going into the motor are the same colour with no identification =
stripe on=20
one of them then probably not.</FONT></DIV>
<DIV><FONT size=3D2></FONT>&nbsp;</DIV>
<DIV><FONT size=3D2>The wipers may park in a slightly different=20
place.</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><BR></DIV>
  <DIV dir=3Dauto>Other than turning battery around and flashing the =
voltage=20
  regulator, are there any concerns with changing my 65 Spridget to =
negative=20
  ground?
  <DIV dir=3Dauto>Is tach mechanical or=20
electric?</DIV></DIV></BLOCKQUOTE></BODY></HTML>

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From: Stan Fickes via Mgs <[email-masked]>
Date: Sat, 17 Aug 2019 08:19:22 -0400

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My '65 has an electronic tach. Look for the little loop of wire on the
back. The polarity of the loop must be reversed. I cut and spliced the ends
of the loop. See
https://www.carolinasahc.com/Tech%20Tips/Electrical/NegativeGround.html

On Fri, Aug 16, 2019, 7:54 PM i erbs via Mgs <[email-masked]> wrote:

> Other than turning battery around and flashing the voltage regulator, are
> there any concerns with changing my 65 Spridget to negative ground?
> Thanks
> Working to restart my garage find aftet 25 years.
>
> Ira Erbs
> Portland, OR
> typos and artifacts are the fault of my phone
> 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"auto"><div dir=3D"auto">My &#39;65 has an electronic tach. Look=
 for the little loop of wire on the back. The polarity of the loop must be =
reversed. I cut and spliced the ends of the loop. See=C2=A0</div><div dir=
=3D"auto"><a href=3D"https://www.carolinasahc.com/Tech%20Tips/Electrical/Ne=
gativeGround.html">https://www.carolinasahc.com/Tech%20Tips/Electrical/Nega=
tiveGround.html</a><br></div><div dir=3D"auto"><br></div><br><div class=3D"=
gmail_quote"><div dir=3D"ltr" class=3D"gmail_attr">On Fri, Aug 16, 2019, 7:=
54 PM i erbs via Mgs &lt;<a href=3D"mailto:[email-masked]" rel=3D"noref=
errer noreferrer" target=3D"_blank">[email-masked]</a>&gt; wrote:<br></=
div><blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-lef=
t:1px #ccc solid;padding-left:1ex"><div dir=3D"auto">Other than turning bat=
tery around and flashing the voltage regulator, are there any concerns with=
 changing my 65 Spridget to negative ground?<div dir=3D"auto">Is tach mecha=
nical or electric?</div><div dir=3D"auto">Thanks</div><div dir=3D"auto">Wor=
king to restart my garage find aftet 25 years.<br><br><div data-smartmail=
=3D"gmail_signature" dir=3D"auto">Ira Erbs<br>Portland, OR<br>typos and art=
ifacts are the fault of my phone</div></div></div>
_______________________________________________<br>
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tml</a><br>
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From: PaulHunt73 via Mgs <[email-masked]>
Date: Sat, 17 Aug 2019 14:08:59 +0100 RN3uJUbQKNKuFYeUMvj+GTh5Bgbr3pdhH1y6zUF3hOkNK2woHg5YckVYQFpVRRgH7nWNDKpXLNBPvw==

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If you do have the tach then the polarity of the 12v supply must be =
reversed inside the case as well (as mentioned in that article).

It mentions reversing the coil.  That isn't necessary and won't make any =
practical difference.  Original coils are wired internally to boost the =
HT using the 'auto-transformer' effect as well as connected externally =
to give a certain polarity of spark which jumps the gap easier.  If you =
reverse the coil you keep the polarity but lose some of the =
auto-transformer' effect.  If you don't you keep the full =
'auto-transformer' effect but reverse the polarity of the spark.  Either =
could be significant on veteran low-voltage systems, which would make =
getting the correct polarity coil preferable.  But it should make no =
detectable difference to starting or running with HV systems such as =
ours.

PaulH.

----- Original Message -----=20
  From: Stan Fickes via Mgs=20
  To: i erbs=20
  Cc: mglist=20
  Sent: Saturday, August 17, 2019 1:19 PM
  Subject: Re: [Mgs] Positive earth

  My '65 has an electronic tach. Look for the little loop of wire on the =
back. The polarity of the loop must be reversed. I cut and spliced the =
ends of the loop. See=20
  =
https://www.carolinasahc.com/Tech%20Tips/Electrical/NegativeGround.html

  On Fri, Aug 16, 2019, 7:54 PM i erbs via Mgs <[email-masked]> =
wrote:

    Other than turning battery around and flashing the voltage =
regulator, are there any concerns with changing my 65 Spridget to =
negative ground?
    Is tach mechanical or electric?
    Thanks
    Working to restart my garage find aftet 25 years.

    Ira Erbs
    Portland, OR

    [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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  Archive: http://www.team.net/pipermail/mgs =
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</HEAD>
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<DIV><FONT size=3D2>If you do have the tach then the polarity of the 12v =
supply=20
must be reversed inside the case as well (as mentioned in that=20
article).</FONT></DIV>
<DIV><FONT size=3D2></FONT>&nbsp;</DIV>
<DIV><FONT size=3D2>It mentions reversing the coil.&nbsp; That isn't =
necessary and=20
won't make any practical difference.&nbsp; Original coils&nbsp;are wired =

internally to boost the HT using the 'auto-transformer' effect as well =
as=20
connected externally to give a certain polarity of spark which jumps the =
gap=20
easier.&nbsp; If you reverse the coil you keep the polarity but lose =
some of the=20
auto-transformer' effect.&nbsp; If you don't you keep the full=20
'auto-transformer' effect but reverse the polarity of the=20
spark.&nbsp;&nbsp;Either could be significant on veteran low-voltage =
systems,=20
which would make getting the correct polarity coil preferable.&nbsp; But =
it=20
should make no detectable difference to starting or running with HV =
systems such=20
as ours.</FONT></DIV>
<DIV><FONT size=3D2></FONT>&nbsp;</DIV>
<DIV><FONT size=3D2>PaulH.</FONT></DIV>
<DIV><FONT size=3D2></FONT>&nbsp;</DIV>
<DIV><FONT size=3D2></FONT>&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">
  <DIV=20
  style=3D"FONT: 10pt arial; BACKGROUND: #e4e4e4; font-color: =
black"><B>From:</B>=20
  <A title=[email-masked] href=3D"mailto:[email-masked]">Stan =
Fickes via=20
  Mgs</A> </DIV>
  <DIV style=3D"FONT: 10pt arial"><B>To:</B> <A =
title=[email-masked]=20
  href=3D"mailto:[email-masked]">i erbs</A> </DIV>
  <DIV style=3D"FONT: 10pt arial"><B>Cc:</B> <A =
title=[email-masked]=20
  href=3D"mailto:[email-masked]">mglist</A> </DIV>
  <DIV style=3D"FONT: 10pt arial"><B>Sent:</B> Saturday, August 17, 2019 =
1:19=20
  PM</DIV>
  <DIV style=3D"FONT: 10pt arial"><B>Subject:</B> Re: [Mgs] Positive =
earth</DIV>
  <DIV><BR></DIV>
  <DIV dir=3Dauto>
  <DIV dir=3Dauto>My '65 has an electronic tach. Look for the little =
loop of wire=20
  on the back. The polarity of the loop must be reversed. I cut and =
spliced the=20
  ends of the loop. See&nbsp;</DIV>
  <DIV dir=3Dauto><A=20
  =
href=3D"https://www.carolinasahc.com/Tech%20Tips/Electrical/NegativeGroun=
d.html">https://www.carolinasahc.com/Tech%20Tips/Electrical/NegativeGroun=
d.html</A><BR></DIV>
  <DIV dir=3Dauto><BR></DIV><BR>
  <DIV class=3Dgmail_quote>
  <DIV dir=3Dltr class=3Dgmail_attr>On Fri, Aug 16, 2019, 7:54 PM i erbs =
via Mgs=20
  &lt;<A href=3D"mailto:[email-masked]" rel=3D"noreferrer =
noreferrer"=20
  target=3D_blank>[email-masked]</A>&gt; wrote:<BR></DIV>
  <BLOCKQUOTE=20
  style=3D"BORDER-LEFT: #ccc 1px solid; MARGIN: 0px 0px 0px 0.8ex; =
PADDING-LEFT: 1ex"=20
  class=3Dgmail_quote>
    <DIV dir=3Dauto>Other than turning battery around and flashing the =
voltage=20
    regulator, are there any concerns with changing my 65 Spridget to =
negative=20
    ground?
    <DIV dir=3Dauto>Is tach mechanical or electric?</DIV>
    <DIV dir=3Dauto>Thanks</DIV>
    <DIV dir=3Dauto>Working to restart my garage find aftet 25 =
years.<BR><BR>
    <DIV dir=3Dauto data-smartmail=3D"gmail_signature">Ira =
Erbs<BR>Portland,=20
    OR<BR>typos and artifacts are the fault of my=20
    =
phone</DIV></DIV></DIV>_______________________________________________<BR=
><BR><A=20
    href=3D"mailto:[email-masked]" rel=3D"noreferrer noreferrer =
noreferrer"=20
    target=3D_blank>[email-masked]</A><BR>Donate: <A=20
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