Battery drain

2002 GMC YUKON
200,000 MILES • 1.5L • V8 • 4WD • AUTOMATIC
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EDMASPEED
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My battery drains completely out in about forty eight or less hours. The battery checks good, I have even switched batteries twice (have warranty battery). The alternator was change beginning of August 2017 and still checked okay by a professional. I change old radio and wires radio system for a brand new one by April 2017 (checked okay as well after that). I changed transmission on April 2017 (still running well after that). The connections on the battery all are clean and tight. Fuses are all tight. I even add a separated (on-off switch for the radio can turn off while SUV is parked or not in use). Checked vanity lights, dome lights, hood light, all off.
My SUV still in parking lot for a week and half. Another strange thing is that happen before: after truck is warm up and shifter moves to D (drive ) or R ( reverse) or any shift the battery volts go down less of half. I am frustrated, and overwhelm with this. I love my truck. Please help.
Nov 12, 2017 at 6:11 AM
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Yep these are great tucks. There is one thing I want you to check that is the CD player. Please see if there is a CD stuck in the player which will cause the player to stay engaged with the electrical system. Also there could be problem with the BCM staying alive and not going into sleep mode which can slowly drain the battery.

Here is a guide to help us get started and find the problem.

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

Please let us know what you find.

Cheers, Ken
Nov 15, 2017 at 10:55 AM