The Porsche 928, produced from 1977 to 1995, is a distinguished front-engine, rear-drive luxury grand tourer renowned for its innovative transaxle design and powerful V8 engine. Available with displacements ranging from 4.5L to 5.0L, this model represented Porsche's commitment to performance, luxury, and advanced technology for its era, competing with esteemed vehicles like the Ferrari 400 GT and Aston Martin V8 Vantage. Its engineering emphasis on a balanced chassis, comfortable ride, and high-speed capability made it a unique offering in the sports car market.

This document serves as an Electrical Troubleshooting Manual and Current Flow Diagram for the Porsche 928 (928 Series) in the USA market. It provides comprehensive coverage of the vehicle's electrical systems, including power distribution, ignition, fuel system controls, lighting, instrumentation, HVAC, power accessories, and advanced systems like ABS and cruise control. The manual details systematic troubleshooting methodologies, component testing procedures, wiring harness inspection, and fault code interpretation, offering in-depth technical information for professional technicians and knowledgeable owners. Its purpose is to facilitate accurate diagnosis and repair of electrical issues, ensuring the optimal performance and reliability of the vehicle.