Guys, Im at my wits end. This car has a brand new high capacity interstate battery. Alternator is good. Runs and drives great. Most of the time is will start just fine. Then, every few days, the car will be DEAD. Not even enough charge in the battery to light the dome light. This problem is intermittent. We fully charged it 2 days ago. Went to start it this morning, nothing!

It was at my independants for a week, and he couldnt find anything. It didnt die while it was out there. It is weird because this problem is so intermittent. Whatever is drawing on it, is pretty severe to drain this battery so fast. Its gotten to the point now where I dont trust taking this car anywhere.

Where do I start? Please help.

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93 300D 2.5 Turbo, Black/Palomino 273K
09 E350 Black/Black 41K