Subject: Re: [Mgs] Mgs Digest, Vol 147, Issue 14

From: Eric Russell via Mgs <[email-masked]>
Date: Sat, 17 Aug 2019 14:32:44 -0400

> Other than turning battery around and flashing the voltage regulator...

I believe you need to 'flash' (repolarize) the generator (not the 
voltage regulator). Some electric fuel pumps are polarity specific. Most 
radios sold since the mid 1960's are negative ground. Older radios 
sometimes had a switch for negative or positive ground.

Although written for the MGA, much of the info in the MGA Guru's Tech 
pages also apply to B's & Midgets.

See: http://www.mgaguru.com/mgtech/

Specifically:: http://www.mgaguru.com/mgtech/electric/et202.htm & 
http://www.mgaguru.com/mgtech/electric/et202a.htm

Eric Russell
Mebane, NC
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From: Richard Lindsay via Mgs <[email-masked]>
Date: Sat, 17 Aug 2019 08:46:35 -1000

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Of course, one could leave it positive earth...

The only real issue is if one requires a radio. My TD is positive earth.

http://aubard.us/53_MG/20150414_133137.jpg

My only concern was buying the right replacement fuel pump, which Moss
stocks.

Rick

On Sat, Aug 17, 2019, 8:33 AM Eric Russell via Mgs <[email-masked]>
wrote:

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<div dir=3D"auto">Of course, one could leave it positive earth...<div dir=
=3D"auto"><br></div><div dir=3D"auto">The only real issue is if one require=
s a radio. My TD is positive earth.=C2=A0</div><div dir=3D"auto"><br></div>=
<div dir=3D"auto"><a href=3D"http://aubard.us/53_MG/20150414_133137.jpg">ht=
tp://aubard.us/53_MG/20150414_133137.jpg</a><br></div><div dir=3D"auto"><br=
></div><div dir=3D"auto"><div dir=3D"auto">My only concern was buying the r=
ight replacement fuel pump, which Moss stocks.</div><div dir=3D"auto"><br s=
tyle=3D"font-family:sans-serif"></div></div><div dir=3D"auto"><br></div><di=
v dir=3D"auto">Rick=C2=A0</div></div><br><div class=3D"gmail_quote"><div di=
r=3D"ltr" class=3D"gmail_attr">On Sat, Aug 17, 2019, 8:33 AM Eric Russell v=
ia Mgs &lt;<a href=3D"mailto:[email-masked]">[email-masked]</a>&gt;=
 wrote:<br></div><blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8=
ex;border-left:1px #ccc solid;padding-left:1ex">=C2=A0&gt; Other than turni=
ng battery around and flashing the voltage regulator...<br>
<br>
I believe you need to &#39;flash&#39; (repolarize) the generator (not the <=
br>
voltage regulator). Some electric fuel pumps are polarity specific. Most <b=
r>
radios sold since the mid 1960&#39;s are negative ground. Older radios <br>
sometimes had a switch for negative or positive ground.<br>
<br>
Although written for the MGA, much of the info in the MGA Guru&#39;s Tech <=
br>
pages also apply to B&#39;s &amp; Midgets.<br>
<br>
See: <a href=3D"http://www.mgaguru.com/mgtech/" rel=3D"noreferrer noreferre=
r" target=3D"_blank">http://www.mgaguru.com/mgtech/</a><br>
<br>
Specifically:: <a href=3D"http://www.mgaguru.com/mgtech/electric/et202.htm"=
 rel=3D"noreferrer noreferrer" target=3D"_blank">http://www.mgaguru.com/mgt=
ech/electric/et202.htm</a> &amp; <br>
<a href=3D"http://www.mgaguru.com/mgtech/electric/et202a.htm" rel=3D"norefe=
rrer noreferrer" target=3D"_blank">http://www.mgaguru.com/mgtech/electric/e=
t202a.htm</a><br>
<br>
Eric Russell<br>
Mebane, NC<br>
_______________________________________________<br>
<br>
<a href=3D"mailto:[email-masked]" target=3D"_blank" rel=3D"noreferrer">=
[email-masked]</a><br>
errer" target=3D"_blank">http://www.team.net/donate.html</a><br>
<br>
Archive: <a href=3D"http://www.team.net/pipermail/mgs" rel=3D"noreferrer no=
referrer" target=3D"_blank">http://www.team.net/pipermail/mgs</a> <a href=
=3D"http://autox.team.net/archive" rel=3D"noreferrer noreferrer" target=3D"=
_blank">http://autox.team.net/archive</a><br>
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</blockquote></div>

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[email-masked]

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From: PaulHunt73 via Mgs <[email-masked]>
Date: Sun, 18 Aug 2019 10:43:31 +0100 T9zATdh6Qa3fAOzROakjO4Bu53Wb115V6d3r+wzc3Xv7HlcBLtz2LhRB2hFr2ludA8rnbTgk4y1x5bSQriy1h6AZX1Rl4aOZxOUeoo7NJeagQEAmHZ49e1XO

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For some years now new SU pumps should have been polarity independent =
since they started using a bi-directional points quenching device =
instead of a diode and resistor.  It doesn't help when the boxes are =
labelled 'dual polarity' but the information sheet inside the box still =
states 'All AZX pumps are polarity conscious'.  Polarity-dependant =
devices have red and black insulation (and can be reversed to change =
polarity), polarity-independent devices have the same colour insulation =
on both wires.  I don't know about electronic pumps, but it's hardly =
difficult to make those dual polarity as well.

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

  My only concern was buying the right replacement fuel pump, which Moss =
stocks.
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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><FONT size=3D2>For some years now new SU pumps should have been =
polarity=20
independent&nbsp;since they started using a bi-directional points =
quenching=20
device instead of a diode and resistor.&nbsp; It doesn't help&nbsp;when =
the=20
boxes are label</FONT><FONT size=3D1><FONT size=3D2>led 'dual polarity' =
but the=20
information sheet inside the box still states 'All AZX pumps are =
polarity=20
conscious'.&nbsp; Polarity-dependant devices have red and black =
insulation (and=20
can be reversed to change polarity), polarity-independent devices have =
the same=20
colour insulation on both wires.&nbsp; I don't know about electronic =
pumps, but=20
it's hardly difficult to make those dual polarity as =
well.</FONT></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=20
  style=3D"FONT: 10pt arial; BACKGROUND: #e4e4e4; font-color: =
black"><BR>&nbsp;</DIV>
  <DIV dir=3Dauto>
  <DIV dir=3Dauto>
  <DIV dir=3Dauto>My only concern was buying the right replacement fuel =
pump,=20
  which Moss stocks.</DIV></DIV></DIV></BLOCKQUOTE></BODY></HTML>

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