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To adjust the headlight alignment on a 2003 GMC Denali, park the vehicle on a level surface about 25 feet from a wall. Measure the height of the headlight beams from the ground and mark this height on the wall. Use a Phillips screwdriver to adjust the vertical and horizontal alignment screws located on the back of each headlight assembly until the beam is centered with the marked lines on the wall. Ensure you check the headlights after adjustments to confirm proper alignment.

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3mo ago

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