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To adjust the headlights on a Peterbilt, first, park the truck on a level surface about 25 feet from a wall or garage door. Turn on the headlights and mark the center of the beam on the wall with tape. Adjust the headlights using the adjustment screws, typically located at the back of the headlight housing, until the top of the beam is aligned with the tape mark. Make sure to check both vertical and horizontal alignment for proper visibility.
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