1988 - 1998 (GMT400) Section for all discussion related to the 1987-1998 Chevrolet and GMC trucks.

1994 GMC k3500 electrical glitch

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Old Apr 7, 2016 | 6:02 PM
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GMC-Cummins's Avatar
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Default 1994 GMC k3500 electrical glitch

New here, but I'm at wits end trying to figure out an electrical glitch in my 1994 K3500. Any ideas or input would be greatly appreciated.

Symptoms:

flashers do not work. Turn signals do.
When turn signal is on my speedo needle dances with each flash.
Radio sometimes will turn off then turn back on when using turn signals.
Same thing happens when I turn on wipers (intermittent especially).
Voltage meter does come up much when truck starts, have verified 14.1 volts with digital meter, but dash meter shows low voltage.

Once or twice when A/C was on everything went back to working normally. No malfunctions with volts showing 14 on gauge. Turned truck off, restarted and all my usual symptoms returned. Tried A/C on/off, but could not duplicate 'normal'.

Alternator and batteries recently replaced.

I'm wondering if I have a bad/weak ground somewhere?

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Old Apr 7, 2016 | 6:44 PM
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burnhedge's Avatar
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Sounds like a ground issue. I have to clean/replace grounds on my 92 often when crazy things start happening.
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