Adding Factory-Style Fog Lights to a 2000 GMC Sierra daddycow.com

After completing the wiring, reconnect the battery and test the system. Turn your headlight low beams on, then press the fog light switch. The new lights should illuminate. Switch to high beams—the fog lights should turn off automatically. Aim the lights using the adjustment screws on each housing so the beam pattern hits the road about 20 to 30 feet in front of the truck. Finally, seal all wire connections with heat shrink tubing and zip-tie the harness away from hot or moving parts. With factory-style fog lights properly installed and integrated with your headlight system, your 2000 GMC Sierra will look sharper, drive safer, and retain a completely original appearance.