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Its probably the alternator. Take off your alternator and take it to autozone and they'll test it for you for free.

If it's not the alternator--check the fuel relay and fuel filter.

I had that problem on my 1998 190E. It started by losing power on occasion and then more often, until it quit altogether. Each time the battery seemed to be drained. I actually carried a spare battery around for a while. Changing the battery seemed to correct the problem (for a while). I had the alternator checked and took it to 2 "Mercedes specialists". It actually was the fuel filter and fuel relay. It wasn't something the first 2 mechanics thought about. Hope this helps.

commentI've been having the same probs with my '91 190e, but only when i uuse the a/c. new alt and battery hasn't helped. I'll be changing battery cables soon.
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โˆ™ 2011-09-13 22:56:40
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Q: What could be wrong with a 1992 190E battery won't stay charge something else is killing the battery's power other than that it was running great?
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