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A typical car lighting circuit- The headlampswitch alsooperates side,rear, number-plate and panellights. Power for the car'sancillary circuitscomes from the liveside of the startermotor solenoidswitch. Circuits with lamps inthem are wired inparallel, rather than inseries, so that eachlamp gets the fullmeasure of current. A control box and fusesprotect many circuits. Indicators, brake lightsand reversing lights areeach in separate circuitswith their respectiveswitches. Headlamps have twocircuits, one fordipped and one formain beam.

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How to test electrical circuits

A typical lighting circuit Power for the cars ancillary circuits comes from the live side of the...

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