Equip your semi truck to be Ready for the Road Ahead , with the Grote 12' Slim-Line Under Light Male to Double Female Jumper, a key piece that provides a reliable power transfer to its lighting systems. To transmit currents when a vehicle is switched on or off, this replacement wire acts as a bridge between an internal power source and an external light. Fashioned with a streamlined design for a rapid installation into connectors and lights. FleetPride is your First Click in Heavy Duty .