Their is an foot operated switch on the floor of my 1975 280Sl which I cannot identify. Nothing is mentioned in any of my Manuals. It is high up on the floor, above the clutch. It can't be seen unless you really crouch down.
The wiring diagram in my 107 manual, shows a seperate switch for the winshield waher pump, which I also cannot find, but this doesn't operate the pump. I realize something else could be wrong in the system but a foot operated windshield washer? Thats even to weird for Mercedes.
any help appreciated.

See following link:

http://sl107.com/eve/forums/a/tpc/f/2346035941/m/16...121029202#1121029202

Thanks Wayne that is indeed it. Now I'll try to find out why it doesn't work.