Truck & SUV Backup/ Auxiliary Lighting Wiring & Switch Kit The wiring harness will automatically trigger the auxiliary reverse lights when the system is activated with the included passenger compartment switch. Optionally, you can also easily configure the lights to turn on when the vehicle is placed in the reverse gear. The Factory-Style switch insures you have full control over your auxiliary lighting system. The system can be activated with the switch anytime, even if the vehicle is off. Makes hitching up your trailer at night easy, and increases visibility for vehicles equipped with a backup camera. Auxiliary lighting assists the driver at night by illuminating the rear of the vehicle while in the reverse gear. Helps your vehicle get noticed when backing out of parking spaces, onto busy streets, and other high-traffic areas.