Quote:
Originally posted by blackmercedes
I can find some old posts where a mechanic tested the alternator and it turned out to be bad.
I think we have some misdiagnosis here. It's the clock? Try pulling the fuse for the instrument cluster and seeing if that stops the key-off drain. That's a pretty simple thing to check and your mechanic's wish to just start replaing parts willy-nilly sets off alarms with me.
Getting back to the problem. The obvious needs to be checked: The alternator and voltage regulator. Too much voltage could be frying the battery. Many MB owners have been stumped by an alternator with a lower output that is still charging to some degree. Mechanic puts meter on posts, finds output, and declares charging system okay.
Once the charging problem is sorted, you may have to replace the battery as depp discharging can wreck even a farily new battery...
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I returned to the battery store and had them check the battery and they told me it was good.