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Electrical puzzle - 1980 MGB

To: <mgs@autox.team.net>
Subject: Electrical puzzle - 1980 MGB
From: "Steve Shoyer" <Steve@shoyer.com>
Date: Tue, 17 Sep 2002 00:17:31 -0400
I thought I had the lights working OK on my car, but when I was working on it 
Saturday I noticed that the side, tail, license plate, and reverse lights come 
on with the ignition switch in the "On" position.  I didn't notice that the 
last time, but it could have been the case.  I swapped my ignition switch 
harness with one from a parts car, but the same thing happens.  I've 
disconnected the main light switch that should control most of these functions, 
but it doesn't change the result.  I tried testing the switch, and I think it 
is working correctly:

Switch       W   WG  WR  S
position

 Off         0   0   0   1
  I          0   1   0   1
  II         1   1   0   0
 III         1   0   1   0

I believe that the S line goes to the anti-run-on valve, the WG to the radio, 
WR to the starter, and W to the normal "ignition on" circuits.

The strange thing is that I checked the connector where the switch plugs into 
the main harness for continuity between pins, and the N, W, and WR pins showed 
a connection.

Does any of this make sense?  I've traced the circuits in my Bentley manual but 
I can't see where the problem might be.  I'm guessing there's a short somewhere 
- any suggestions on tracking it down?

Thanks.

--Steve (1980 MGB)

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