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I was under the impression that the alternator could still charge the battery when running but when you turn the car off the voltage regulator can kill the battery...

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I guess it can. I'm having the same problem, and I noticed that lights were over lighting when I reved up the engine. Looks like the alternator is overcharging the system and this could be caused by a defective regulator. I mesured a 6A current passing trough the positive cable of the alternator while the car was of and nothing working. That MUST be what is draining the battery. I'll chage the alternator thursday and give you some news.

By the way, got a new paint?

This post has been edited by trebilihp: Dec 21, 2010 - 9:05 PM

Was actually my alternator. Changed it, runs well. Look if there's a leak from the positive cable of the battery. If there is, (wich is actually the problem here), unplug the positive cable from the alternator. Chek if there's still a leak from the battery. If not, it might be a short in your alternator, caused by some blown ''diodes'' (don't know if we call it this way in english) in the regulator, cause the alternator is plugged in parallele with the electrical circuit.

Might not be the problem, but at least try this test and you might be set for your alternator..