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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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2,589 Posts
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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2002 chevy trailblazer_lt
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I have a multimeter and the same problem. I would be very thankful for any tips/help. Thank you!
"Same problem".... do you also have a new battery then and it goes dead? What have you done so far to attempt to determine the cause?
 

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When I first got the vehicle, it ran fine for a couple months then the battery began to wear down, which wasn't new. So I swapped it with a battery I already had which is 3 years old. Again, everything was fine but only for a couple of weeks this time. The same symptoms as previous battery. It charges when running but after 2-3 hours of sitting the multimeter reads 10.26 and doesn't drop anymore than that. My lights have never dimmed while driving with either battery. I read about parasitic draw and took out the OnStar and the instrument panel fuses though it made no difference. That's as far as I've got.
 

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2002 chevy trailblazer_lt
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Just to confirm, in case I misread something. The battery currently in the car was already 3 years old when you installed it?

And we all know that a battery that has been run dead has a shorter life expectancy.
 
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