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Old 05-08-2002, 09:51 PM
Join Date: Apr 2001
Posts: 86
300SL drains battery?

I've got a '90 300SL that kills the battery in about two days. I did the test light between the battery termal and the cable and pulled every fuse in the large fuse box under the hood and the small one in the trunk to no avail.

I didn't put a DVOM on it but from the looks of the test light it much be at least a 15 amp draw. Is there another fuse panel in the car somewhere?

Anyone have any ideas what could be drawing so much juice and not be fused?

Thanks in advance!

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Old 05-08-2002, 10:46 PM
elau's Avatar
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Join Date: Nov 1999
Location: MD.
Posts: 1,725
Did you leave the key in the ignition when not in used? The key will kill the battery in a couple of days.
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Old 05-09-2002, 01:10 AM
Gilly's Avatar
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Join Date: Mar 2001
Location: Evansville WI
Posts: 9,616
Yep, good one, you have to remove the key from the ignition. Also is there a cell phone? that has to be shut off as well. If the key is out and nothing is left on, then possibly the alternator is discharging it. Try disconnecting the B+ at the back of the alternator.
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