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[cam]

I’ve had a similar issue with my battery getting drained by a dark current.  I’ve traced it down to a failing alternator.  Something inside the alternator fused/melted/do not really know but was messed up and as long as the battery was physically connected, it would drain. Once I replaced the alternator, the problem went away for a while.  Just out of habit, I now always disconnect the battery cable at the battery.

 

Just FYI... the local auto parts store rebuilt alternators have been very low quality.  Still wish I had my orginal one.

 

Hope this helps