Wired: 1965 Coronet Engine Compartment Wiring Restoration Nov 07, 2018The new engine wiring harness and its components were the first to be installed of the three engine bay wiring harnesses. This shot shows the firewall plug location on the top. Left to right shows the ballast resistor, horn relay, voltage regulator and starter relay in all of their correct locations and wire routing for a ’65 B-Body. Engine Compartment Detailing - How To Make Your Engine Jan 14, 2010A yellow car could use silver in the engine compartment, while an orange engine compartment could run with either a matching orange engine or a contrasting gray. Silvers and grays are neutral colors that fit with any color.