[carpenterkc]

I am currently having a very similar issue with my 2003 Tahoe. battery dead in short time. I have a remote start system, but have tried unhooking it.

observations- battery will go dead in 24 hours, or sooner. took it to napa and had a buddy check the charging system, and did a load test with an analog load tester. both check out. pulled negative battery cable, hooked up voltmeter between cable and post, set on dc10A. once the connection was made amp draw spiked to 3 ish amps until everything including the CD changer reset and shut down. meter reads 0.26 amps. so i started pulling fuses. pulled the 15 amp radio fuse and the amp draw immediately dropped to 0.03 amps.

this is where it gets complicated. after driving it for an hour home last night at 9:30 and my wife driving it to doctors office at 10:00 this morning, the battery was dead before soccer practice this evening. This occurred with the radio fuse OUT!!! I'm losing my mind and cant afford to pay for maybe.

as far as unhooking the remote start, I pulled the lower panel under the wheel and unhooked all of the taps into the factory harness. and for the bad diode in the alternator, wouldn't that show up as a draw on the voltmeter?

I'm sure I am missing something here, any advice at all would be greatly appreciated.