Problems with 1989 300E Alternator
 

We have been having problems with our 300E alternator. I have owned the car since 1992. It always seemed like the battery was just a little undercharged although I would have it checked out and they would say the alternator was okay. In the meantime we replaced window operators several times and other electrical components.

In 2002 I replaced the alternator. I gave the car to my daughter and while she was on a trip last year the alternator gave out again. She had it replaced and now it is giving out again.

I am wondering if this is a weak spot on this car. I saw in an article that someone recommended replacing the alternator with a S420 alternator and converting the clip to the two post setup. What are the three posts on the plug and what does the conversion entail?

Thanks,

Jim Marshall

Moved for better answer.
 

Moved for better answer.




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