GMC 16502973 Headlamp Bulb

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To adjust a headlight, use spring-loaded screws for the beam headlights and Torx-head screw adjusters for composite headlights. You will need a blank wall, level floor beneath it; masking tape should be positioned vertically in reference to vehicle centerline and headlight centerlines on the wall. Also, a horizontal tape line may be positioned referring to the centreline of all headlights. The adjustments ought to be carried out while the vehicle is sitting level with half-full gas tank and no more than normal weight load inside it. When starting with low beam adjustment, place your high intensity zone two inches below the horizontal line but two inches to the right of vertical line coming from headlight. In order to raise or lower beam turn top adjusting screw clockwise or counterclockwise correspondingly while side adjusting screw is applied for moving light left or right. In High-beam mode, this concentrated brightness band should sit just below the horizontal line, centered vertically. After doing so then finally you can fix your lights as you see fit.

To install, plug the new bulb assembly into the electrical connector, insert it into the receptacle, and rotate clockwise to lock it into place.

Finally, the headlights should be adjusted accordingly.

For composite headlights, open the hood and remove the two headlight retainers to drop the assembly forward and down. Reach behind the assembly to turn the bulb holder counterclockwise and unplug it.

Start by removing the radiator grille for sealed beam-type headlights. Then, carefully remove the retainer screws without disturbing the adjusting screws. Pull the headlight out enough to unplug the connector and remove the headlight.

Starting with the low beam adjustment, the high intensity zone should be positioned two inches below the horizontal line and two inches to the right of the headlight vertical line.

With the high beams on, the high intensity zone should be vertically centered just below the horizontal line.

For composite headlights, open the hood and remove the two headlight retainers to drop the assembly forward and down. Reach behind the assembly to turn the bulb holder counterclockwise and unplug it.