The C3 series of the popular Chevrolet Corvette was produced between 1968 through 1982. The headlight assemblies are virtually the same on all of these models while the headlights themselves are quite unique. The headlight door assembly works on a vacuum system powered by the engine. To raise and lower the headlights, the car engine must be running. After replacing bulbs, it is recommended that the headlights be readjusted. Save some time and money by adjusting the headlights yourself following these simple steps.
Park the car on a level surface about 2 feet from a flat facing wall.
Start the car to activate the vacuum system that operates the headlight door opening and closing. Turn the headlight switch on and raise the headlight assembly. Place the lights in the low beam position. Turn the ignition off leaving the headlight doors up.
Place a long piece of masking tape horizontally on the wall, level with the center of the headlight beams and extend it to the outer edge of the light. Place a small piece of tape vertically crossing the center point of each beam. This will give you a reference point for your adjustments.
Start the car and move it back about 25 feet from the wall. Turn off the car leaving the headlights on.
Locate the adjustment screws on the outer edge of the headlight retainer rings. The high beams are the inside bulbs and there will be one screw at the top and the other on the bottom left. The low beams are the outer bulbs. The adjustment screws are at the top and the lower right.
Adjust the low beams to match your tape marks. Turn the top screw clockwise with a Phillips screwdriver to raise the lights to the marks. Turn the top screw counter clockwise to lower the beams.
Turn the side screws as needed to adjust the low light beams left to right until the beam is directly at the center of your original marks
Turn on the high beam lights and adjust them using the above process. Aim the beams to an illumination point slightly under the tape line and inside the cross markings of the low beam points.
Start the car, and turn off the lights
