Truck-Lite (960Y100) Turn Signal Switch Truck-Lite 960Y100 OEM Switches Navistar Replacement #3566945C91 Navistar #2042616C91 & 3566945C91 Surpasses SAE J589 & J910 standards for turn & hazard functions Improved high impact, light weight, nylon housing & handle Capable of flashing 18 lamps in hazard mode (9 lamps per side for turn signal flashing) Improved design eliminates premature breakage & component wear Feature Lift-to-Dim & Flash-to-Pass options Brake overrides hazard function lights when brake pedal is depressed