Starter Wire

Short answer: The 12-gauge purple wire (from the starter switch, through the firewall plug) goes to the “S” terminal, which actuates the starter solenoid.

The “R” terminal is a relay contact that, while cranking, feeds a direct path to the ignition coil’s positive terminal — this maximizes coil voltage for a hotter spark while the starter loads (and drops) the system. When the engine starts and the switch is released, “R” disconnects and the coil runs normally through the ignition switch and resistance wire.

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