HORN, Horn Wiring Diagram for GMC Suburban R2500 1991, List of elements for Horn Wiring Diagram for GMC Suburban R2500 1991:, Cigarette lighter, Convenience center (behind left side of i/p), Fuse block, Horn relay, Horn switch, Horn/dm fuse 20a, Hot at all times, Left horn (left front of radiator support), Right horn (right front of radiator support), Steering column switches, To, , , COOLING FAN, RADIO, DEFOGGERS, POWER DOOR LOCKS, HORN, POWER MIRRORS, POWER WINDOWS, STARTING/CHARGING, WIPER/WASHER, ,