The headlights on your Mercedes 300D can be adjusted if you are having a hard time seeing while driving at night. Normally, this does not need to be done. However, if you think your headlights have become misaligned or your headlight assembly has been replaced and the new assembly did not come pre-adjusted from the factory, you will want to know how to adjust the headlights on your 300D.
Tools Used: Tools, Phillips-head screwdriver
Park your 300D 25 feet away from a closed garage door so that the car is facing the door. Turn on the headlights and open the hood. Turn the adjustment screws on the top of the headlight until the center of the headlight beam is positioned at the bottom of the garage door. The beam should sit where the door and the ground meet. The headlights should also overlap by 50 percent and be positioned directly in front of the vehicle.