Might also want to check if your car has the original OVP (overvoltage protection relay) Common failure part known to cause all sorts of problems. do a search--lots of info including old and new part numbers for ID purposes.

J. M. van Swaay

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1994 E320 Wagon, 230,000 miles
1995 E320 Sedan, 106,000 miles
1994 E500 Sedan, 79,000 miles