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Discussion Starter #1
I have a 2002 GMC Envoy 4wd in line 6cyd. I have new battery, new alternator. If I shut vehicle off within 15-30 min. battery is dead, please help!
 

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2004 gmc envoy_slt
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You need to see if there is a parasitic current drain on the battery. An Ammeter is placed in series with the positive battery cable and the current measured after allowing all modules to go to "sleep" should not be greater than 100 mA. If this is not the case, remove each fuse in the 2 fuse boxes, one at a time, until the current reduces.
If the battery drains that quickly, I would expect a very large current drain.
 

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2005 chevy trailblazer_ls
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I like to keep it simple in the beginning. My new battery kept draining like that and it turned out the technician had stripped the battery sidepost so it was making very little contact, thus not charging sufficiently. Bought a set of side lugs at Autozone and it fixed the problem. Hope your problem is this simple to fix.
 
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