Original 1983 Ford/Mercury 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 Mustang & Capri Models. It contains a wealth of information and will prove invaluable in service procedures on this model. 0333-503-83 Good condition with normal wear, blemishing and soiling from use in a Dealership [see photos]. The back cover has a piece torn off of it.