Battery drain

ROB 1503

MEMBER
2008 CHEVROLET COLORADO
3.7L
5 CYL
2WD
89,000 MILES

Hi,

My brother has been having an electrical issue with his truck. There seems to be something draining the battery. He already replaced the battery twice. He hasn't installed any electronics, everything is stock. So, I wanted to ask if anyone could guide me on how I can figure out where and what is draining the battery.

Thank you,
Rob

3 Replies

SQM

MECHANIC
6,383 POSTS

Hello,

There could be number of reasons why there is excessive parasitic draw (current drain) on the battery. It could be due to a component staying on (with the key off), or a faulty window switch or any other electrical component.
The best way to determine this is to use a multimeter and take reading on the battery as you unplug different fuses. This vehicle should have less than 25 milliamps of parasitic draw.

Here is a helpful video that shows exactly what to do:

https://youtu.be/z5F7WpgjaRs

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

I have attached some information on parasitic draw below.

Please let me know of any questions.
Thank you.

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Monday, December 6th, 2021 AT 9:04 AM

ROB 1503

MEMBER
63 POSTS

Hi,

Sorry about the late reply. I really want to thank you for your help. I was able to find out what was draining the battery. Turns out it was the stereo. The CD player motor would turn on as if a CD was being inserted. Funny thing is that it would turn on a few minutes after the trucks alarm system had been activated. So, he ended up replacing it with an aftermarket stereo and everything has been ok ever since. Again, thank you.

Rob

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Tuesday, December 21st, 2021 AT 10:21 PM

SQM