Question about 2002 Chevrolet Silverado
Check the idle rpm (efi around 900 rpm ) carby around 750-800rpm. Very few alternators charge under 750 rpm as it requires 14 volts to charge the battery and at low revs the alternator will be producing around 11.5-12 volts. Check tension and condition of drive belt.
Posted on Apr 20, 2013
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Posted on Jan 02, 2017
9 times out of 10 it is the factory amplifier. I had this same problem and it was the amplifier. Disconnect the amp located in the trunk by the speakers and see if the drain continues. You will not have music, but having the amp replaced with an aftermarket one will solve this problem,
Posted on Jan 14, 2010
Very low idle will cause a very low voltage output from alternator, so nothing unusual about that. At low idle the truck is basically drawing from the battery, not the alternator. As soon as you cure the idle problem, the alternator gauge reading will return to normal.
Posted on Jan 22, 2010
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