Initially none of the window work, I thought it was the switch since all but one of the switch on this car were broken. So I took the known good switch from the 1985 300SD. Now the front driver side and rear passenger side work, I understand these are on the same fuse as the front passenger and rear driver side.

I did a quick test light on all the fuse, got dark so I did not take a photo on which fuse were dead during my reading.

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1984 300D, 1972 LT1 Corvette, 2014 Artic White 3LT/Z51 C7, 2013 650i Convertible BMW, 1994 Kawasaki Vulcan, 1992 Yamaha Seca II and 1996 Dodge Ram 2500.

There are two fuses for windows on a 123. Fb and Fc. They feed the windows as shown below.
Excuse the crude graphics I'm typing this on an iPad.

--hood--

Fb...... Fc

Fc...... Fb

--trunk--

There are a couple things to try
- stuck window regulator blew the fuse
- frequent flexing of wire pack in door hinge area (the rears seem to be worse about this) causes wires to break and or short.

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The OM 642/722.9 powered family
Still going strong
2014 ML350 Bluetec (wife's DD)
2013 E350 Bluetec (my DD)

both my kids cars went to junkyard in 2023
2008 ML320 CDI (Older son’s DD) fatal transmission failure, water soaked/fried rear SAM, numerous other issues, just too far gone to save (165k miles)
2008 E320 Bluetec (Younger son's DD) injector failed open and diluted oil with diesel, spun main bearings (240k miles)

1998 E300DT sold to TimFreeh
1987 300TD sold to vstech