Date registered: Sep 2010
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Battery drains, car won't start
I have an otherwise perfect 2004 E320 wagon. A few months ago I left the key in the ignition, came out to find the car dead, boosted it, no sweat ... since then, however, big problems. The battery slowly drains over 24 - 36 hours, and the car then won't start. It is not the alternator. It is not the battery. When the current is measured out of the battery, it has a minimal draw. It's as if some computer wakes up in the middle of the night, draws a lot of power, and sucks the battery dry. One wonders whether the initial event, where the battery was drained by the key in the ignition, caused some software problem that has produced my current woes. I have a very good, experienced mechanic who is also stumped.
I've read of other people posting similar problems, but little in the way of answers ... anyone have any suggestions?