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Re: Gauges acting up when shifting to reverse 1990 c3500
I agree it sounds like something is losing ground.
Check all grounds.
The instrument panel grounds at a screw next to the ALDL connector.
There is a ground wire between the back of the passenger side cylinder head and the fire wall.
The ECM and engine sensors ground at the front of the intake manifold under the front intake bolts/studs or by the thermostat.
Check the ground between the negative battery cable and the fender.
Test for voltage between the engine block and the negative battery bolt.
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For those of you that are wondering why you are not getting replies to your thread:
Did you give the model, year, engine, fuel system type, and transmission information?
If it is modified from what came stock from the factory, let us know that too.
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