Check out this thread on my windows.
Window fuses located on passenger's side by firewall but I guess you already know that.

http://www.peachparts.com/shopforum/vintage-mercedes/392059-76-280c-fr-pass-window-will-not-go-up-rear-drivers-will-not-go-down.html

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1976 280C
SLOWER DRIVERS KEEP TO THE RIGHT.
DRIVE RIGHT PASS LEFT