Hey Tod,
Most likely, it's the tach ground itself. When you run the engine with the
lights off, the tach is getting its ground path via the light bulb in the
tach, and then when you turn the lights on, that ground potential is
replaced by 12 volts, and the tach quits. You can verify this by popping the
light bulb socket out of the back of the tach, and most likely your tach
will quit right then and there. If it doesn't then the problem might still
be that part of the daisy-chain ground wiring is broken, and it's pulling
the ground current through one of the other instruments.
The best way to diagnose the problem is to either verify that all of the
instruments are solidly connected to the daisy chain ground wires, and that
all of those daisy-chain grounds are also connected to the steel dash rail,
or else you can pop all of the light sockets out of all the instruments, and
then see which instruments still work.
Theo
-----Original Message-----
From: owner-tigers@autox.team.net [mailto:owner-tigers@autox.team.net] On
Behalf Of Theodore Brown
Sent: May 1, 2004 12:24 PM
To: tigers@autox.team.net
Subject: Lucasian Gremlins
Hi All:
Do I have a bad ground somewhere?
If so, where might it be? Any help would be appreciated.
Tod
B382002384LRXFE
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