Replace the fuse in the overvoltage relay. It is under the hood at the rear of the engine and has a red top on it. There is a 10a fuse in it that will blow if jumpstarted. If the fuse isn't bad, it may need the whole relay. We sell them in the partsshop.

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Benzmac:
1981 280GE SWB
1987 16V
ASE CERTIFIED MASTER AUTO TECHNICIAN
SERVICE MANAGER FOR 14 BAY FACILITY
MERCEDES SPECIALIST 8 YRS
PARTNER IN MERCEDESSHOP.COM