1970 Ford Maverick Wiring & Vacuum Diagrams 1970 Ford Maverick Wiring & Vacuum Diagrams: These diagrams are from a Chilton's Manual printed in 1970. They should be virtually identical to 1970-1973 models and similar to 1974-77 models. Ford Maverick Wiring Diagrams - maverickcomet This is where you will be able to view 1970-1977 Ford Maverick Wiring diagrams in PDF format. This means that they will be WYSIWYG (What-You-See-Is-What-You-Get) Main Wiring Diagram Printed Circuits. 1971 Main Wiring Diagram Printed Circuits. 1972 Main Wiring Diagram Printed Circuits. 1973 Main Wiring Diagram Printed Circuits. 1974 Stereo Wiring | Maverick/Comet Forums You can either run your own FUSED wire to the battery or tap into the cigarette lighter wire if your radio requires it. There isn't a Ground wire in the factory wiring harness either. The factory used a chassis ground through the mounting strap bolted to either the side or back of the Factory Radio (I've seen the old Ford Radios mounted both ways).