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