Thanks for the help - I will try to check on these things tonight and will report back with results.

As for the switches, I don't think they are bad because all 4 of them are not working (simultaneously) and when I picked the car up the seller said he thought the windows were all working. I think he removed his custom stereo to return the stock Becker and that's where something went wrong, because he said he might have unplugged something during the process. So I think the suggestion to check voltage on the "A" and "B" fuses is most promising...

Again, I will check these and report back.

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08 W251 R350
97 W210 E320
91 W124 300E
86 W126 560SEL
85 W126 380SE Silver
85 W126 380SE Cranberry
79 W123 250
78 W123 280E
75 W114 280