Starter solenoid Wiring Diagram Chevy | Free Wiring Diagram Variety of starter solenoid wiring diagram chevy. A wiring diagram is a simplified traditional photographic representation of an electric circuit. It shows the parts of the circuit as simplified shapes, and also the power and also signal connections between the gadgets. 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.