altenator not keeping a charge

GMC C1500
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95GMC1500
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i have a 95 gmc 1500 serria with a 5.7 V8 and the altenator when i turn the air on high and have my subs going it kicks down to about 12 on my gauge what would cause this problem
May 25, 2007 at 7:20 PM
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PULSTI
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try replacing the alt to batt wire with a larger gauge, i needed this after installing subs in my yukon. the small factory wire wasnt supplying the battery with sufficiant power. hope this helps!!
Jun 4, 2007 at 7:32 PM
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