How did you check them?
I've posted this so often I'm getting bored - fuses and the fuesbox connections corrode badly on certain Mercedes. Replace ALL the fuses with new ones, and clean all the contacts in the fusebox. Only then is it worth looking at anything else.
2.5-16v 1990 90,000m Astral Silver
2.0E 8v 1986 107,000m Black