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You can certainly use a separate switch alone with its own circuit breaker (like the "override switch" in the diagram). The reason for the relay is to leave the control of the headlights with the 3-lever switch.

Repeating (copied from earlier thread): A relay is a electromechanical device, which uses a low current coil (electromagnet) to move contacts, which in turn can control much higher currents. On the deuce, all lights are controlled by the 3-lever switch on the dash. It has a built-in circuit...