HORN, Horn Wiring Diagram for GMC Pickup C3500 1992, List of elements for Horn Wiring Diagram for GMC Pickup C3500 1992:, (front of right front fender) g101, (left radiator support) g108, Base, Convenience center (left side of i/p), Fuse block (left side of i/p), Horn relay, Horn switch, Hot at all times, Left horn (below left headlamp), Park lp fuse 20a, Right horn (front of center radiator support), V22 only, , , DEFOGGERS, COOLING FAN, POWER MIRRORS, HORN, POWER WINDOWS, POWER DOOR LOCKS, POWER SEATS, RADIO, STARTING/CHARGING, WIPER/WASHER, ,