These are pictures of a 1989-1991 928S4 wiring loom:

ABS-RDK

Alternator

Engine

Headlights

Interior

Loudspeakers

Automatic transmission

Door right (passenger)

Porsche 928 S4 wiring loom ABS RDK 92861212119

 

Porsche 928 S4 Wiring loom alternator 92860700217

 

Porsche 928 S4 wiring loom engine 92860701509

 

Porsche 928S4 Wiring loom head lights 92761200110  (check part number !)

 

Porsche 928 S4 wiring loom interior 92861200351

 

Porsche 928 S4 wiring loom loudspeakers 92861206804

Wiring loom Automatic Transmission:

Wiring loom right door