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A typical car lighting circuit

A typical car lighting circuit The headlamp switch also operates side, rear, number- plate and panel lights. Power for the car's ancillary circuits comes from the live side of the starter motor solenoid switch. Circuits with lamps in them are wired in parallel, rather than in series, so that each lamp gets the full measure of current. A control box and fuses protect many circuits. Indicators, brake lights and reversing lights are each in separate circuits with their respective switches. Headlamps have two circuits, one for dipped and one for main beam.