A typical car lighting circuit- paul-ryan.info 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

If there is trouble without an obvious cause in any electrical component, test the circuit to fin...