When two windows wouldn't work (driver & right passenger), I checked that fuse and it looked fine. I sanded the fuse ends and holder, coated with silicone grease, then the windows worked. Same deal a week later with the sun-roof. I knew the problem was "too much supply resistance" since I measured at the window switch and saw the 12 V supply drop to <1 V as I tried to operate either window. I think there are quality and cheapie Euro fuses sold and I probably bought the later.

Interesting that M-B ran separate wires for L & R to the rear running lights. That must have been a safety concern so you at least have one light burning.