I have to jump my battery off every morning

2008 CHEVROLET AVALANCHE
49,000 MILES • V8 • 2WD • AUTOMATIC
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CROSSQ
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i have to jump my battery off every morning but after it cranks up the voltage is well over 14 and it will run all day but my battery and alternator is both check out?
Mar 8, 2010 at 11:21 AM
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SQM
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Hello,

It sounds like you might have excessive amount of parasitic draw (current drain) on the battery.
Every electrical circuit with a battery will have a little parasitic draw, however it can become excessive due to a faulty component. Like a glove box light staying on or a shorted power seat switch etc.
You will have to use a multimeter to see what is the current drain on your battery. This vehicle should have 25 milliamp or less parasitic draw. Anything more is considered excessive. Keep in mind that having a draw more that 750 milliamp can make the battery go dead in a day or less.

Here is a helpful video of how to check for parasitic draw:

https://youtu.be/z5F7WpgjaRs

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

I have attached some helpful information on the parasitic draw for your vehicle.

Please let me know of any questions.
Thank you.
Oct 4, 2021 at 9:16 AM