1993 GMC C2500
289,000 MILES
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batts dead over night. new alt batts test good. disconnect alt batts stay charged. now what?????
Dec 15, 2012 at 11:07 PM
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ASEMASTER6371
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you need to insert a amp meter in line with negative cable. remove the fuses till the reading goes to 0. then you know what circuit has the draw. trace it down to the failed part.

Roy
Dec 15, 2012 at 11:10 PM