Hi,

I have a problem with 1982 500SEL euro.

I replaced the inline pre-resistor for aux fan, however, jumping high temperature switch pigtails does nothing to aux fan. If you remove the relay and jump pins, fan comes on. Both relay sockets get voltage.
I tested the relay by swapping it with the high speed one and it is good. So the issue is with wiring?
Pigtails tested show 0V.
Does anyone have a wiring diagram so that I can ensure proper wiring from the pigtails to the fusebox?

Thank you!

Update: Found wiring diagram in German. Seems that the issue is in wire from receiver drier to fusebox relay C or one of the brown wires at receiver drier has a bad ground. Will investigate further.