1978 E-250, 460, Auto, AC, I assume truck will be very similar. I have electrical diagrams but none of them show the pin connections to the actual switch connector.. Get the complete wiring diagram for a 1978 Ford F150, including detailed schematics for all electrical components. Easily diagnose and repair any electrical issues in your classic Ford truck with this comprehensive wiring diagram.
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The wiring diagram for the 1978 Ford F-150 ignition switch will show two blue wires, one running to the starter solenoid on the + side, and the other running to the key switch.. Description Covers 1978 F-Series (F-100 / F-150 / F-250 / F-350) truck. This truck wiring diagram is for light- and medium-duty pickup-style trucks. It includes the complete basic truck, comprised of interior and exterior lights, engine bay, starter, ignition, charging systems, gauges, under-dash harness, rear clip, and more.
![[DIAGRAM] 1978 Ford F 150 Starting System Wiring Diagram](http://ww2.justanswer.com/uploads/AlSmitty/2010-04-17_210947_Starting_Diagram.JPG "[DIAGRAM] 1978 Ford F 150 Starting System Wiring Diagram")
