try cleaning the switches. My 84 190 is the same way. Was told back windows not working and they don't. Thhe other day I noticed the back window about 1" down??? I didn't lower it, maybe my roomie? I hit the switch and it raised up, that all, didn't try it again as I had no time to mess with it. I will be removing the switches and giving a good cleaning.

I bet your's * mine will work fine after cleaning switches.

I've found electical components are much more reliable and durable than people think. the problems usually prove to be a bad/loose connection or sticky switch.

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1987 300TDT
1981 VW MKI Caddy 1.6 diesel, waiting on engine swap
1983 D-50 Power Ram 4x4 "Mitsubishi" 2.3 turbo diesel
assorted gas powered crap and motorcycles

RIP: 1984 300TDT, 1982 300TDT, 1984 190D 2.2, 1992 300D 2.5, 1987 300TDT, 1982 Maxima LD28, 1983 Maxima LD28, Isuzu C223 P'ups X3, 1983 Holiday Rambler 6.2 Banks turbo diesel, 1984 Winnebago LeSharo 2.1 TD, 1985 Allegro 6.5