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2000 Gmc Jimmy Voltage Drop


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My Jimmy's voltage gauge will drop from just over 14 to about 1/4 of the way from the bottom and bounce when I am in reverse with nothing on except the DRL's. When this happens all my lights dim but I don't have any loss of power. When i accelerate the gauge returns to about 14. When I'm stopped at a light the gauge drops again and bounces. Its worse when I have the rear defroster on or the vents on 4. It only seems to drop at low RPM.

 

I replaced the battery about 2 months ago and the alternator about 6-9 months ago.

 

I checked the grounds (batt to engine, engine to chassis, chassis to batt) and all of them were fine. Does anyone know what could be causing this to happen?

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