Original 1983 Ford Dealer Electrical Wiring & Vacuum Diagram Service Manual. This manual was used by the Factory Dealership to diagnose and identify electrical and vacuum problems on the Bronco, F100-350 Truck Models. It contains a wealth of information and will prove invaluable in service procedures on this model. Good condition with normal wear and soiling from use in a Dealership [see photos]. 0333-521-83