Repair Tip "1972 Chevrolet Nova wiring" - Fixya This is the wiring diagram for a 72 Chevy Nova. Everything that's needed to get the engine electrical up and running. Eng. is the engine bay wiring.Author: Rene.. 72 1972 Chevy Nova Electrical Wiring Diagram Manual - I-5 this is for a new 1972 chevy ii nova wiring diagram manual. the manual shows the color of the wires, location that each wire runs to and gauge of wire.