Battery drains within hours to a day after it is jumped?

MARCUSTSTAPES

MEMBER
2008 CHEVROLET TAHOE
5.3L
V8
2WD
AUTOMATIC
172,156 MILES

My car battery drains within hours to a day after it is jumped, or AutoZone fully charges my battery. I replaced battery 3 weeks new, alternator and starter 1 week new and alternator 175amp fuse 2 days new. Battery still drains after a few hours to a day later. What could it possibly be?

6 Replies

KEN L

MASTER CERTIFIED MECHANIC
45,703 POSTS

Yep, I have seen the A/C compressor relay stick closed and drain the battery on these trucks. Here is the location so you can remove it to see if the drain goes way, also here is a guide you can go over to help you see what other items can cause the battery drain.

https://www.2carpros.com/articles/car-battery-dead-overnight

The A/C relay is under the hood in the main fuse panel. Check out the images (below). Please let us know what happens.

Image (Click to make bigger)

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Monday, September 16th, 2024 AT 2:00 PM

MARCUSTSTAPES

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4 POSTS

So I charged my battery today to 75%. I just removed the ac compressor relay. Ill post update tomorrow to see if battery still drains. But it does explain why every time I disconnect and reconnect the battery, my ac is running even though I never turned it on before disconnecting the battery or jumping the car.

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Monday, September 16th, 2024 AT 5:29 PM

KEN L

MASTER CERTIFIED MECHANIC
45,703 POSTS

Yep, you may have found the problem, though I would like to see the battery charged to 100%. Please let me know I am interested.

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Tuesday, September 17th, 2024 AT 8:52 AM

MARCUSTSTAPES

MEMBER
4 POSTS

I charged the battery to 100%. I havent put it back in yet, im going to re install when I go to work tonight and see what happens when I get off in the morning. I'll KYP.

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Tuesday, September 17th, 2024 AT 12:20 PM

MARCUSTSTAPES