This switch controls the rear work lights from the dashboard of the host tractor. It is a direct-acting toggle that completes the circuit to the rear lighting relay. When the switch fails, the rear work lights will not illuminate, or they may flicker intermittently. The original part matches the mounting hole pattern and the electrical connector keying of the factory harness, so no adapter or wiring modification is needed. On installation, verify the switch seats fully into the dash panel and that the locking tab engages.