One Low Beam or High Beam Headlamp Inoperative

Connect test lamp from left/right headlamp connector terminal "B" (Quad Headlamp) or terminal "A" (Base Headlamps) to battery positive terminal. If test lamp does not light, service/repair open in wiring between affected headlamp and ground. If test lamp lights, check for an open in wiring between affected headlamp and splice for inoperative low beam or splice for inoperative high beam. If okay, replace affected headlamp.