My E has 135K on her... When I use the intergrated climate control info setting, I see that the alternator has trouble maintaining consistent voltage. Last night when it was cooler the charging voltage actually stabilized. Stabilizing I mean that the voltage stays constant for at least a few seconds, ex. 13.0 or 13.1 for at least a few seconds depending on the electrical consumption. Normally it consistently flickers between 12.9, 13.0, 13.3 a few times per second. I had charging problems during the extreme winter last year at one point. SO I figure I don't want to play with brushes and voltage regulators and rather replace the entire unit. I am assuming that my E still has her original alternator in her. BenzBin has a decent price for an alternator, ofcourse with returning the core :-)

What ya guys think?

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'97 E300
'99 E300