1979 300sd (w116)

Bought my second 1979 300sd (w116) last year and inherited a window switch that when depressed to move the window down it actually goes up.

I only have this problem with the drivers side switch, front and rear.
Passenger side switch is OK.

I removed the switch from my other 79 and installed it on the 79 with the problem. It acted the same way. I believe it might be a wiring issue.

Please advise

Wiring. Switch the wires on the hand control if you can. Otherwise you will have to remove the door card and switch the wires there. Also wonder if you have two passenger side switches installed by mistake?

The older style switches used int the w116 can actually be physically reversed. If you unplug it, flip them around, it will work as intended.

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2004 F150 4.6L -My Daily
2007 Volvo XC70 -Wife's Daily
1998 Ford F150 -Rear ended
1989 J-spec 420SEL -passed onto its new keeper
1982 BMW 733i -fixed and traded for the 420SEL
2003 Volvo V70 5 Speed -scrapped
1997 E290 Turbo Diesel Wagon -traded for above
1992 BMW 525i -traded in
1990 Silver 300TE -hated the M103
1985 Grey 380SE Diesel Conversion, 2.47 rear end, ABS -Sold, really should have kept this one
1979 Silver 300D "The Silver Slug" -Sold