The Porsche 928, introduced in 1979 for the USA market, represents a significant departure in Porsche's lineage, designed as a luxurious front-engine, rear-wheel-drive V8 Grand Tourer. This model aimed to blend potent performance with exceptional comfort, distinguishing itself with an innovative transaxle design and a powerful 4.5-liter V8 engine. Its engineering quality and commitment to advanced technology for its era positioned it as a premium offering, competing with other high-end European GTs and earning accolades such as Motor Trend Import Car of the Year. The 928 was envisioned for affluent buyers seeking a sophisticated and capable vehicle for long-distance travel, embodying a unique blend of sports car dynamics and luxurious appointments.

This manual serves as a comprehensive guide to the electrical systems of the Porsche 928, specifically tailored for the 1979 USA Model. It covers a wide array of electrical components and functions, including lighting, ignition, fuel, cooling, instrumentation, and various accessory systems. The manual provides extensive troubleshooting guidance for common electrical issues, detailed component testing procedures, and diagnostic techniques to help identify and resolve faults. Its purpose is to empower owners, mechanics, and technicians with the knowledge necessary to maintain and repair the vehicle's complex electrical architecture, ensuring optimal performance and reliability.