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Engine Electronics system wiring diagram of Porsche 928 S model year 1985 is shown in the following picture. It shows the connection between the vehicle components such as the RPM and reference mark transmitter, electrical shield, EZF control unit, intake air temperature sensor, temperature sensor double NTC, control unit, air volume meter, ignition switch buzzer contact, throttle valve switch, solenoid valve, kick down switch, starter backup lamp, gear change indicator switch, auxiliary fuel pump, plug connection for gear change indicator on instrument cluster, central electrical system, injection valves, ignition distributor, tester, oxygen sensor, idle speed regulator, cable connector, coupling switch, and many more. Here is the wiring diagram :

1985 Porsche 928S Model 85 Engine Electronics System Wiring Diagram (click to enlarge)

Anti-lock brake, trailer coupling, and alarm system wiring diagram of Porsche 928 S model year 1985 is shown in the following picture. It shows the connection between the vehicle components such as the control unit, door lock, central electronic system, instrument cluster, ground connection, socket, ABS relay, alternator, door contact, and many more. Here is the wiring diagram :

1985 Porsche 928S Model 85 ABS, Trailer Coupling, Alarm System Wiring Diagram (click to enlarge)

Radio system wiring diagram of Porsche 928 S model year 1985 is shown in the following picture. It shows the connection between the vehicle components such as the separating point, basic equipment, fuse installed in radio, speaker, radio, antenna amplifier, antenna windshield, extension cable, cable harness fade regulator, interference suppression coil, booster, antenna electric. possible connection, central electrical system, separating plug, hi-fi system, speaker unit, connection diagram booster, and many more. Here is the wiring diagram :

1985 Porsche 928S Model 85 Radio System Wiring Diagram (click to enlarge)