You have a faulty fuse in the fuse box. I'd replace all of the fuses with the updated ones that are made from copper.
Even when fuses look good, they can be bad. They can burn at the top and bottom contact points where you can't test or see!!!!!! This has kicked my a-- a couple of times!!


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Benzmac:
Donnie Drummonds
1992 500E (very soon I hope
1981 280GE SWB
ASE CERTIFIED MASTER AUTO TECHNICIAN
SERVICE MANAGER FOR 14 BAY FACILITY
MERCEDES SPECIALIST 8 YRS
PARTNER IN MERCEDESSHOP.COM