How to Aim Your 2005 Sierra Headlights Correctly storeboard.com

The aiming procedure varies slightly based on your headlight type. Factory halogen reflector housings produce a more diffuse pattern without a sharp cutoff, making aiming more subjective. Focus on centering the brightest area within your marked grid. Aftermarket projector assemblies (both HID and LED) feature a distinct cutoff line that must align precisely with your horizontal reference—any upward tilt of this line creates dangerous glare. Complete LED drop-in assemblies designed for the GMT800 platform often include built-in leveling indicators; follow the manufacturer's specific instructions if provided. For trucks equipped with the factory load-leveling system, ensure the sensor linkage is intact and functioning before adjustment.