SBC Starter Circuit Wiring - Route 66 Hot Rod High SBC Starter Circuit Wiring. Simple Starter Wiring Diagram. Starter Problem. I ran into a strange problem when I shut off the engine after running my sbc 305, the starter momentarily engages as the engine dies. It makes a loud clanging sound. Both the starter solenoid and ignition are on separate relays from the 1954 ignition switch. How to Wire a Chevy Starter | It Still Runs A Chevy starter requires a lot of amperage, which in turn requires a large 4-gauge wire from the battery to the starter solenoid. The solenoid acts like a switch, opening and closing the high amperage circuit to the starter. The ignition key supplies the power to actuate a relay, which in turn actuates the solenoid.