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Dan, ASE Certified Technician
Category: Chevy
Satisfied Customers: 2270
Experience:  20 Year Factory Trained Current GM Technician
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Chevy tahoe: I had the battery checked and every thing..lights inside

Resolved Question:

My chevy tahoe's battery drains overnight and I had the battery checked and every thing checks out good. I also checked all the lights inside to see if one may be staying on and draining the battery but everything looks find. Any idea what could be using the power?
Submitted: 7 years ago.
Category: Chevy
Expert:  Dan replied 7 years ago.
Is this a tahoe or a grand Prix?

Customer: replied 7 years ago.
Expert:  Dan replied 7 years ago.
What year of tahoe?

any aftermarket accessories loke a remote starter or an alarm or a tv?
Customer: replied 7 years ago.
2004 chevy tahoe, LT
Customer: replied 7 years ago.
no aftermarket accessories.
Expert:  Dan replied 7 years ago.
I have seen issues with the a/c control head causing the battery to go dead and also the On-Star staying powered on and discharging the battery.
To test, you need a Volt meter that can measure amp draws in milli amps. You then need to disconnect the negative battery cable and hook up the amp meter between the disconnected negative battery cable and the negative battery post. Using a disconnect switch is best to use.
Here is a file on how to do the draw test.
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