How To Replace Fog Lights 03-06 GMC Sierra 2500

Difficulty: Intermediate · About 45 min · Gmc Sierra

Replace a fog light assembly on a 2003–2006 GMC Sierra 2500 while preserving its adjustment position and verifying the lamps aim correctly afterward.

Steps

1. Remove the old fog lamp

   Remove the two 10mm bracket fasteners and ease the lamp out of its mount. Mark the adjuster position, remove its screw, disconnect the bulb and wiring, and guide the lamp and bracket out through the bumper opening.

2. Transfer and mount the bracket

   Release the adjuster clip from the old bracket if it is being reused. Position the bracket behind the bumper and feed the replacement lamp through the opening without pinching the wiring.

3. Reconnect and secure the lamp

   Install the adjuster screw and clip, then reconnect the bulb and vehicle harness. Start both bracket bolts by hand and tighten them securely, keeping the assembly aligned with its original mounting position.

4. Test and aim the fog lights

   Switch on the fog lamps and confirm both illuminate. Adjust the beam using the adjuster, aiming the light pattern according to local requirements and the vehicle service information.

Check your vehicle’s repair manual for exact specifications and fit.