The Porsche 928 S, a 1986 model year 2+2 Grand Tourer Coupe, represents a significant chapter in Porsche's engineering history. Conceived as a more comfortable and practical alternative to the iconic 911, the 928 features a potent 4.7-liter V8 engine and a sophisticated transaxle layout for optimal weight distribution. Its distinctive styling, advanced technology for its time, and luxurious appointments positioned it as a premium GT capable of competing with the best from Europe. This model is celebrated for its unique engineering, offering a blend of performance and comfort that set it apart in the luxury sports car market.

This manual provides comprehensive coverage of the electrical system troubleshooting and repair for the 1986 Porsche 928 S. It details engine management, fuel injection, ignition, lighting, instrumentation, HVAC controls, power accessories, audio systems, ABS, cruise control, and more. The manual includes in-depth circuit diagrams, component identification, wire colors, connector pinouts, and step-by-step diagnostic routines for common electrical faults. Its purpose is to assist owners, mechanics, and technicians in accurately diagnosing and repairing electrical issues, ensuring the continued optimal performance and reliability of this classic Porsche.