Mystery Battery Draw While Parked UPDATE
Update 13 Jan-- ----------- Never know--somebody on here might have an idea what to look for, thanks for any help. 2003 Chev 2500HD LT (so has lots of electrical stuff that works with ignition...
Forum Discussion
Don't rule out the alternator.
While it may appear fine, charge well etc, a bad diode in the rectifier bridge can cause an undetectable "leakage".
I had that once in an old car. The battery would run flat after sitting a few days. I had a dickens of a time figuring it out until I disconnected the alternator and found no drain with it unplugged, and the main battery wire removed. Took it apart, replaced the rectifier assembly - end of problem.
While it may appear fine, charge well etc, a bad diode in the rectifier bridge can cause an undetectable "leakage".
I had that once in an old car. The battery would run flat after sitting a few days. I had a dickens of a time figuring it out until I disconnected the alternator and found no drain with it unplugged, and the main battery wire removed. Took it apart, replaced the rectifier assembly - end of problem.
