This manual provides a comprehensive wiring diagram specifically for the 1989 Ferrari 328 GTB and 328 GTS (hardtop). It offers a detailed visual representation of the electrical system, outlining the connections and pathways of various components. The diagram covers a wide range of systems, including the main fuse and relay box, cable color codes, alternator and starter motor circuits, fuel injection system, ignition system, windscreen wiper and washer, horns, current socket, controls and displays, external lights and controls, radio, door glass winders, door locking actuators, interior lights, cigarette lighter, heating and air conditioning systems, and the ABS system. While this manual focuses solely on the wiring diagram, it is worth noting that separate manuals for the 328 GTS/GTB owner's manual, technical specifications, and workshop manual are also available.

The 1989 Ferrari 328 GTB/328 GTS wiring diagram is a vital document for anyone working on the electrical system of these iconic sports cars. This diagram provides a comprehensive visual representation of the intricate network of wires, connectors, and components that make up the car's electrical system. It maps out the flow of electrical current from the battery to every component, including the engine control unit, lighting, instrumentation, and accessories. The diagram is essential for troubleshooting electrical problems, identifying component locations, and performing repairs. Its detailed nature allows technicians to understand the complex interactions between different electrical systems and pinpoint the source of any issues.

The 1989 Ferrari 328 GTB/328 GTS, produced from 1985 to 1989, represents a significant milestone in Ferrari's history. These models showcased a departure from the traditional Pininfarina design language, featuring sharp, angular lines and a low-slung profile. The 328 GTB and GTS were powered by a 3.2-liter V8 engine, delivering impressive performance and a thrilling driving experience. The GTB, a coupe, offered a more enclosed cabin, while the GTS introduced a removable targa top for an open-air driving experience. These cars were lauded for their agile handling, responsive engine, and sophisticated design, solidifying their position as highly sought-after classics. Today, both the 328 GTB and GTS remain popular among enthusiasts, attracting collectors and drivers alike. Owning a 1989 Ferrari 328 GTB/328 GTS, however, requires a deep understanding of its complex electrical system, making the wiring diagram an indispensable tool for any owner or mechanic.