Question about 2002 GMC Envoy XL

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Bad battery or alternator

1990 gmc 3/4 ton p/u w/5.7 eng.i left door open all nite recently and had to get a jump.since then my volt gauge has not been above 12 and if i turn it off it will not make a sound at all when i try to start it. i have changed 3 batteries so far and yesterday i replaced the alternator.the volt gauge went up to 14, but by dark when i hit the headlites the draw was back down to 12 and it bounces when i hit the signal indicater. i turned it off last nite and tried to start it and nothing, the AAA guy could not even jump it with his rig. taking a trip very soon, need piece of mind! HELP

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Check for loose connections batt. and at alt.

Posted on Dec 04, 2011

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Check alt fuse, check from alt positive post to battery make sure you have 14 at alt and close at battery also if you ran battery down a few times may need to be checked and or charged that and dont be fooled some alternators that are rebuilt just had a little part here or there replaced ya might have got a bad one

Posted on Jul 31, 2010

  • clay richards Dec 04, 2011

    autoparts store will check both for free

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