The 55w bulb is the high beam bulb. There are 2 lamps in the inner access
door closest to the radiator. Remove the cover from the side that works
and turn the lights on. You will see the little marker light bulb glowing in
there and that should help you find it on the dead side.
Regards,
Dr.D

__________________
Dr.Diesel -
Shop Foreman
Master Guild Mercedes-Benz Technician.

Think the dealer is expensive? Do you know how much it costs to train a dealer tech? Or buy the required MB special tools to have on hand?