HORN, Horn Wiring Diagram for Porsche 928 S4 1991, List of elements for Horn Wiring Diagram for Porsche 928 S4 1991:, (in engine compartment near air conditioning condenser) g101, Central electric (in passenger's footwell on safety wall), Contact unit, D13, Fuse 24 7.5a, Hot at all times, N15, Sliding contact unit, Steering wheel (w/horn contact), Two- tone horns relay, Two-tone horn, Wipe/ wash switch (w/horn contact), , , COOLING FAN, POWER MIRRORS, HORN, RADIO, POWER DOOR LOCKS, POWER WINDOWS, DEFOGGERS, TRUNK, TAILGATE, FUEL DOOR, STARTING/CHARGING, WIPER/WASHER, ,