How to Aim Your 2004 GMC Sierra Headlights Correctly gzmorsunled.wixsite.com

Isolate the Beam: Turn on your low-beam headlights. To avoid confusion, cover the headlight you are not adjusting with a thick piece of cardboard or a towel. Do not use plastic or cloth covers inside the housing as the heat from the bulb could damage the lens or housing . Locate the Adjuster: Look behind the headlight assembly near the radiator support. You will find a vertical aiming screw. On the 2004 Sierra, this typically requires an E8 Torx socket to turn, though some aftermarket housings may use a Phillips head or a 10mm hex .