Battery drain

2004 CHEVROLET TAHOE
240,000 MILES • 5.3L • V8 • 4WD • AUTOMATIC
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RAY PAYNE
  • MEMBER
  • 1 POST
One day after sitting all night it will start fine and then the next day it may be drained. Got it started drove it for about an hour parked it let it sit for about 45 minutes tried to start it completely drained.
Nov 19, 2021 at 2:26 PM
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SQM
  • AUTOMOTIVE REPAIR CONTRIBUTOR
  • 6,383 POSTS
Hello,

Sounds like the vehicle have excessive parasitic draw (current drain).
Typically, this points to a faulty electrical circuit or something staying on like a glove box or cargo area light etc.
To find out where is the excess draw is coming from you will need a multimeter and check the battery drain.

https://www.2carpros.com/articles/how-to-use-a-voltmeter

Take a look at his video, it shows how to find the parasitic draw:

https://youtu.be/z5F7WpgjaRs

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

Please let me know of any questions.
Thank you.
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Nov 19, 2021 at 2:33 PM
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