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2004 C230 Kompressor Sport Coupe
1,903 Posts
You've done everything I would have suggested. I'm not sure what else you can do at this point. Might be tempted to pull the alternator brushes and check to make sure they are OK. Perhaps you have a bad brush or diode that's throwing lots of hash onto the lines. Of course then the next step is isolation ... not always a band-aid, but sometimes the perfect solution.
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