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Re: [Mgs] Coil type for a 1980 MGB

To: <ccrobins@ktc.com>, <mgs@autox.team.net>
Subject: Re: [Mgs] Coil type for a 1980 MGB
From: PaulHunt73 via Mgs <mgs@autox.team.net>
Date: Wed, 2 Sep 2015 08:23:36 +0100
Delivered-to: mharc@autox.team.net
Delivered-to: mgs@autox.team.net
References: <01c701d0e29a$ecaa9e70$c5ffdb50$@gmail.com> <75BD8D43A2E34923A50B8FB13A2E5BB1@paul> <55E4ACF1.5020807@ktc.com> <2ED01B47F85A4AAEB09A4564CBA1BE9C@paul> <55E5D072.8010107@ktc.com>
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My mistake, I was thinking of the coil measurement.

But you still don't need to disconnect the battery to measure the =
ballast resistance, in fact because of the way some ignitions are wired =
that would prevent you measuring it anyway, as the battery may be needed =
to operate an ignition relay to connect the coil feed wire to 12v.

As long as the wires are removed from the coil to stop any current =
flowing you can measure resistance on a wire that is carrying 12v, for =
the same reason that birds can sit on a 400kV power line.

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


  Are we on the same page?  The way I read it, it was a resistance =
measurement from the coil positive wire to the white or white/brown wire =
on the fuse box, with the ignition switch turned on, in order to find =
out if there was a ballast wire in the coil harness.  I wouldn't attach =
my ohmmeter to a hot circuit.

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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML><HEAD>
<META content=3D"text/html; charset=3Dwindows-1252" =
http-equiv=3DContent-Type>
<META name=3DGENERATOR content=3D"MSHTML 8.00.6001.23588">
<STYLE></STYLE>
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<BODY bgColor=3D#ffffff text=3D#000000>
<DIV><FONT size=3D2>My mistake, I was thinking of the coil=20
measurement.</FONT></DIV>
<DIV><FONT size=3D2></FONT>&nbsp;</DIV>
<DIV><FONT size=3D2>But you still don't need to disconnect the battery =
to measure=20
the ballast resistance, in fact because of the way some ignitions are =
wired that=20
would prevent you measuring it anyway, as the battery may be needed to =
operate=20
an ignition relay to connect the coil feed wire to 12v.</FONT></DIV>
<DIV><FONT size=3D2></FONT>&nbsp;</DIV>
<DIV><FONT size=3D2>As long as the wires are removed from the coil to =
stop any=20
current flowing you can measure resistance on a wire that is carrying =
12v, for=20
the same reason that birds can sit on a 400kV power line.</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><BR></DIV>Are we on =
the same=20
  page?&nbsp; The way I read it, it was a resistance measurement from =
the coil=20
  positive wire to the white or white/brown wire on the fuse box, with =
the=20
  ignition switch turned on, in order to find out if there was a ballast =
wire in=20
  the coil harness.&nbsp; I wouldn't attach my ohmmeter to a hot=20
circuit.<BR></BLOCKQUOTE></BODY></HTML>

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