This manual covers the 1985 Porsche 928 S, a front-engine V8 luxury grand tourer renowned for its advanced engineering and distinctive design. As a significant departure from Porsche's traditional rear-engined sports cars, the 928 S featured a transaxle layout for optimal weight distribution, a powerful 4.7-liter V8 engine, and a focus on comfort and technology. Competing with established luxury coupes of its era, the 928 S offered a unique blend of performance and refinement, characterized by its smooth ride, advanced (for the time) automatic climate control, and a comprehensive analog instrument cluster.

This Wiring Diagram Supplement provides factory-level detail for the complete electrical system of the 1985 Porsche 928 S. It details all circuits, including engine management, lighting, HVAC, power accessories, and instrumentation, offering component location referencing, circuit tracing, and troubleshooting guidance for electrical faults. The manual is presented in English, allowing for easy navigation and access to critical technical information. This resource is designed to assist owners, technicians, and mechanics in accurately diagnosing and repairing the electrical systems, ensuring the continued performance and reliability of this iconic vehicle.