Well tightening the belt definitely helped the situation. Battery is now being properly charged. However, I do agree with the alternator upgrade. Thats something, I've been looking at for a few weeks now. I believe a 1995 S 500 alternator (143/150 amps) would be a direct bolt on fit on the 1990 190E 2.6, correct? Does the 1999-2002 ML alternator also fit a 190E without any modifications? Thats something I intend on doing in the near future, in addition to my manual engine water cooler.

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1990 190E 3.0L