This manual provides comprehensive technical information for the 1985 Porsche 928 S, a distinguished grand tourer known for its V8 engine and sophisticated engineering. The 928 S, produced in Stuttgart, Germany, represents a significant evolution in Porsche's lineup, offering a blend of performance and comfort. This particular model features a 4.7-liter V8 engine, Bosch L-Jetronic fuel injection, and was available with either a 5-speed manual or a 3-speed automatic transaxle. Its robust construction, including a reinforced safety cage and optional Anti-lock Braking System (ABS), underscores Porsche's commitment to quality and driver safety.

This document serves as a dedicated Wiring Diagram and Electrical Troubleshooting Manual, focusing on the intricate electrical systems of the 1985 Porsche 928 S. It covers essential areas such as engine management, lighting, instrumentation, power accessories, climate control, audio systems, and starter/charging systems. The manual includes detailed procedures for diagnosing and repairing electrical faults, component testing guidance, wiring harness identification, fuse and relay locations, and connector pinouts. It is designed to assist owners and technicians in maintaining and repairing the vehicle's electrical components, offering a valuable resource for understanding and resolving complex issues.