The usual cause of a dimly glowing light, particularly if it increases as
you increase the electrical load, is bad diodes in the alt. However bad
connections between the alt and the rest of the electrics could possibly
cause it, if it is very dim.
The best thing to do is measure the voltage on each side of the warning
light with the engine running at about 1500rpm. You can do this at the
brown/yellow at the alt and the white at the fuse-box, or ignition relay if
you have one, and the battery.
Ideally you should see about 14.5v on all three. The light will glow if the
brown/yellow and white voltages are different, but it needs 2 or 3 volts
difference to be visible. Further diagnosis depends on which of the three
are higher, or lower, than 14.5.
PaulH.
----- Original Message -----
From: "Carter Tuggle" <goutvols2@home.com>
To: "mgs list" <mgs@autox.team.net>
Sent: Friday, December 14, 2001 11:11 PM
Subject: electrical problem
> I wrote in a while back about my 79 midget. Long story short. Bad
> alternator, cased bad battery. Replaced now but still have a faint glow
on
> the ignition light.
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