1966 Ford Truck Wiring Diagrams - FORDification - The 1966 Ford Truck Wiring Diagrams . From the 1966 Ford Truck Body Builders Layout Book - Grayscale version CLICK HERE to view some notes about this diagram. 1966 F-100 & F-250 Instrument Panel: 1966 B-, F- and T-Series Ignition, Starting and Charging: 1966 B-, F-, T-, N- and NT-Series 1966 Chevy pickup dash wiring diagram? | The H.A.M.B. Restoring my Chevy I got a wiring harness for the dash that it had in it when I got it, which was a standard heating unit with the single pull knob. After running numbers I found that truck had a deluxe heater in it so swapped my dash out for the correct one. NOT the same electrical. Can't seem to find info anywhere. Any help is appreciated! 1966 All Makes All Models Parts | 14515 | 1966 GMC C/K If you're tired of trying to read and decipher cryptic black and white wiring diagrams out of your old shop manual, this wiring diagram is the solution. This diagram includes two 8-1/2" x 11" full-color drawings, with the dash-to-engine compartment harness on one side and the dash to the rear lights on the other.