This manual covers the Porsche 928 S, model year 1989. The 928 represents Porsche's foray into the luxury grand tourer segment, distinguished by its front-engine V8 configuration and rear transaxle, a design choice aimed at optimizing weight distribution and handling. Known for its advanced engineering for the era, the 928 S offered a blend of performance and comfort, positioning it as a premium GT against competitors like Ferrari and Aston Martin. Its unique selling proposition lay in its sophisticated technology and the brand's reputation for engineering excellence and reliability.

This comprehensive Wiring Diagram Manual and Electrical Troubleshooting Manual provides detailed information essential for maintaining and repairing the 1989 Porsche 928 S. It focuses on electrical systems, including engine control, fuel injection, lighting, climate control, and safety systems, offering component identification, wiring schematics, and diagnostic procedures. The manual is designed to assist owners, mechanics, and technicians in troubleshooting electrical issues, performing component replacements, and understanding the vehicle's complex electrical architecture, ensuring optimal performance and longevity.