Good original 1983 Ford/Mercury Dealer Electrical Wiring & Vacuum Diagram Service Manual Supplement. This manual is to be used with the 1983 Mustang/Capri Electrical & Vacuum Troubleshooting manual for complete coverage. This supplement is for the 2.3L EFI Turbo Engine and includes NO INFO on the 6 or 8-cylinder engines. This manual was used by the Factory Dealership to diagnose and identify electrical and vacuum problems on the 2.3L EFI Turbo Engine Mustang & Capri Models. It contains a wealth of information and will prove invaluable in service procedures on this model. 0333-503-83S