Installing Fog Lights on a Base Model 1999 GMC Sierra 1500 storeboard.com

After double-checking all connections, reconnect the battery and test the system. Turn on your low-beam headlights, then press the dash switch. Adjust the fog light aim using the built-in screws or shims; the top of the beam should sit slightly below the center of the fog light housing when aimed at a wall 25 feet away. Correctly aimed fog lights complement your restored headlights beautifully—the headlights project distance and width, while fog lights fill in the foreground and road edges. The final result transforms your base model Sierra from a utilitarian work truck into a safer, more capable vehicle ready for any weather or road condition. With clear headlights and properly installed fog lights, you will wonder how you ever drove without them.