96 Suburban, 5.7l, 4x4 - Slow Battery Drain

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cuzed2

Lisle, IL

#1 Jan 20, 2007
Seems I have a small electrical leak, a minor short to ground - something is draining the battery?

After a week of sitting the battery will go dead (despite a new battery and alternator)

If I unhook a battery terminal and reconnect thru an ammeter >> I am getting about 160mA of current draw. What should the normal draw be?

I'm thinking the computer and other items should be pulling no more than a few mA?

Anyone know what the current draw should be with truck and all accy's turned off?

Anyone have a similair problem?
Eddie T

New Bedford, MA

#2 Mar 14, 2007
I have the same problem. I just had a new rear end put in. I asked my mech to take a look at this drain that I can't figure out. He disconnected the neg and ran the light test pulling out every fuse. The light never went out or dimmed. Let me know if you figure this one out. I'll be trying to nail this one down this weekend.
Paul

Daly City, CA

#3 Apr 21, 2007
Same thing with me I have ran through 2 batteries in 3 months, newer alt. somethings's draining, if you have an idea let me know.

texblues@comcast.net
RonH

Norman, OK

#4 Apr 21, 2007
Look in the phone book for Automotive Electrical shops. They have the equipment to daignose the problem. It's cheaper than new batteries every few weeks.
jamac

United States

#5 Sep 25, 2007
same thing happening to our 96 suburban. Have had in the chevy garage several times, can't find problem.
Steve

Bremerton, WA

#6 Oct 14, 2007
Eddie T wrote:
I have the same problem. I just had a new rear end put in. I asked my mech to take a look at this drain that I can't figure out. He disconnected the neg and ran the light test pulling out every fuse. The light never went out or dimmed. Let me know if you figure this one out. I'll be trying to nail this one down this weekend.
Did you guy's ever get this problem figured out ? I'm pulling my hair out ! Thanks Steve
Steve

Bremerton, WA

#7 Oct 14, 2007
Did you guy's ever get this problem figured out ? I'm pulling my hair out ! Thanks Steve
Richard

Salem, OR

#8 Nov 19, 2007
I also have this problem on a 99 Tahoe , replaced battery and alt. but still a slow drain , after a day of sitting without starting battery goes dead but i get it started and it charges back up anybody have any solutions
kdgncop

Columbia, MO

#9 Dec 4, 2007
I just bought a 97 that had a new battery last summer and after sitting it would pull it down. Before I would buy it I made them figure it out and one of the door toggle deals that controls the dome lights was bad/shorting out. havent had any problems with it since. just somewhere else to look.
sflattem

United States

#10 Dec 5, 2007
Same problem 96 GMC Sub 4WD
New battery...---->dead
AAA jump, let run 1 hour
next day...dead

AAA tow to Amoco...tech found radio was draining battery...waiting for junk yard radio to see if works
Russell W

Fort Collins, CO

#11 Dec 7, 2007
I'm searching for answers to another problem but found a post regarding a 'parasitic' drain on the battery. That post said that the rear a/c heater relay(s) can fail and cause it. Remove the right rear quarter trim and disconnect the 3 relays....wait and see. It also mentions that there should not be more than a 50mA drain when sitting. Hope this helps!
Luis

United States

#12 Jan 15, 2008
Same thing with my 98 K1500LS. First it was the switches on the vanity mirrors, then it was the courtesy light under the hood. Now that I've read the post about the interior light door switches, radio and rear AC I'll try those...
Mark

Franklin, TN

#13 Jan 19, 2008
96 suburban 4wd
Had the same problem with the elctrical leak, battery would go dead if the car sat for a week or two. I looked for electrical drains, changed the battery, altenator and still had the same issue. A couple months ago the starter crapped out and after replacing the starter the electrical leak is gone. This is the last place I would have looked. I never researched how the starter could cause this leak, I was just happy the iisue was resolved. Not sure how to test the started but it may be another avenue to check or replace in the pursuit of fixing the issue with you rigs.
Mark
chiakev

AOL

#14 Jan 20, 2008
I have a 2000 GMC Sierra, Z-71, I drove the truck every day for 2 yrs. With gas prices, I could not afford to so bought small car. Now my truck battery has a slow drain on the battery. Everyone said it was the remote starter, so I removed it. Now one week later, dead battery. The draw is about 2-3 amps. The battery is 7 mos old and the alternator is 4 mos old. My wiring and everything else is now factory original. Any ideas?
Thatoneguy

San Jose, CA

#15 Feb 2, 2008
If you can measure the drain on the battery with an ammeter then start pulling fuses untilthere is no drain and you should be able to find the leak???

I would think?
satsoccermom

Bronx, NY

#16 Feb 14, 2008
Chevy van and tahoe, same thing: battery drain- have pulled the fuse for the interior lights, battery has started even after sitting for over a week in sub zero temps. Disconnected the vanity lights in the van, works great- so now I will do the same for the Tahoe, Hope this helps
Hector

Wallisville, TX

#17 May 28, 2008
From Houston texas
I have a suburban 1978 in I have the same problem.
slow like, if the truck is park for a week, don't
want to start.
any recomendecion
Scott

Pittsburgh, PA

#18 Jun 4, 2008
When I bought my '96 Suburban (used), we had the same problem. After a lot of futzing around, it seemed to be related to the lighted vanity mirrors in the visors. They were disconnected and the problem went away.
Andy

Newport, KY

#19 Jun 11, 2008
I had the same problem, then the starter went out. I had replaced the battery and thought it was bad, but apparently the starter was draining the battery. Now both are replaced and it works fine.
gjc

Cincinnati, OH

#20 Aug 11, 2008
Service bulletin 020139007 hvac module causing battery drain. Evidently gm mechanics don't read these service bulletins. They talked the current owner into replacing both air direction motors because they said they weren't stopping and they were draining the battery. Ended up it was the service bulletin listed above.

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