Most of my experiences have been a bad battery except for one time when it turned out to be a bad starter on my 190E. In the 4 MB's I have owned, they wouldn't jump start when the battery's went bad and there was no warning. A friend of mine owns an Indy MB shop and he advised me to not go past 4 years on the original MB battery. Well, I didn't listen and was stuck in a Mall parking garage on a Friday evening. Luckily there was a Sears Auto store there so I put in a new battery and drove home.

I see that you have a '67 C2 Convertible...Big $ car and going up in value every year.

Good luck resolving your starting problem.

Dave

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1993 190E 2.3
2001 SLK230
1971 LS5 (454) Corvette Convertible