The Ferrari 328 GTB and 328 GTS, produced in 1989, represent a significant evolution in the marque's mid-engined V8 sports car lineage. Building upon the foundation of its predecessor, the 308, the 328 features an enlarged 3.2-liter V8 engine, delivering 220 horsepower and 203 lb-ft of torque, paired with a standard 5-speed manual transaxle. This model is distinguished by its classic Ferrari styling, renowned handling characteristics, and the inclusion of an Anti-lock Braking System (ABS) as standard. Approximately 712 GTB and 2,745 GTS models were produced, making them highly sought-after by collectors and enthusiasts of classic Italian exotics.

This manual serves as a dedicated wiring diagram resource, offering a comprehensive and highly detailed schematic of the 1989 Ferrari 328 GTB/GTS electrical system. It is an indispensable tool for diagnosing and repairing electrical faults, covering major components and their interconnections, including the fuel injection system, ignition system, lighting, HVAC, power windows, door locks, audio systems, and the ABS. The manual facilitates component identification, cable tracing, and circuit analysis, providing accurate representations crucial for correct maintenance and repair. It is intended for Ferrari owners, mechanics, and automotive technicians specializing in classic Italian vehicles.