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Fuel, Volts, Temp gauges not working

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Old 06-27-2017, 07:46 PM
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Car: 1987 GTA
Engine: 5.7
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Fuel, Volts, Temp gauges not working

I had my alternator out and ever since I put it back in, my fuel gauge is all over the place. Reads empty, then past full and sometimes slowly moving in between. My volts read about 9 and the temp just sits at 40. I checked the actual voltage and it's fine. This all happened after the alt went back in. Wondering what the commonality is?
Old 07-03-2017, 01:49 PM
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Car: LOWERED ♦ CRIMSON METALFLAKE
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Transmission: 765R4
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On The Edge

You didn’t mention the model and year so this info is generic.

If you have a normal (non digital) dash there’s no way R&R’ing the alt can damage the instruments.

Even reversing the polarity can’t.

If it’s a digital dash then that weakens the system.

If you have a normal (non digital) dash the most likely cause of the problem is a bad ground.

Squeeze behind the dash, make sure the connectors are tight and use an ohmmeter to make sure the grounds are making good contact.


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