I have a 190E 2.3 16V, when I use the rear window defroster it works, but when I turn it off I always blow a fuse. I know I can leave the defroster on till it turns itself off and I have done this without any problems
any Ideas?

Eddie
1986 2.3 16V
Smoke Silver

Based only on the wiring diagram and your symptoms I would have to vote for a bad combination relay. All the switch position wires (on and off) go to the relay. The off side of the relay must be shorted.

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Steve Brotherton
Owner 24 bay BSC
Bosch Master, ASE master L1
26 years MB technician