What could cause this?
Its been fine since i bought it, but one night after work, it spun over slowly and wouldnt crank. Tried again, and the battery just died. Got a jump and it fired right up, and drove 25 miles home with headlights, heat, and wipers with no problem. Cranked up in the driveway after i got home too. This yesterday morning, it wouldnt crank. Just clicking from the starter. So, i took the battery to Autozone, where they did a deep cycle charge and confirmed the battery was fine. Put it back in the car and it had a charge of 12.54 on the meter. While running, charging system was kicking it up to 13.65+/-. Checked it a little while later with engine off and the battery was down to 12.26 then 12.19 and this morning, it was down to 11.90.
So, whats the first things i should look at, if there is such a common occurence? All accessories are off, by the way. The only thing i have done to it lately has been to remove the aux water pump(siezed) and by pass the leaking, broken, non-functioning acc servo.
thanx guys.

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1980 300D