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The automobile lighting circuit includes the wiring harness, all the
lights, and the various switches that control their use. The complete
circuit of the modern passenger car can be broken down into
individual circuits, each having one or more lights and switches. In
each separate circuit, the lights are connected in parallel, and the
controlling switch is in series between the group of lights and the
fuse box. The parking lights, are connected in parallel and
controlled by a single switch. In some installations, one switch
controls the connection to the fuse box, while a selector switch
determines which of two circuits is energized. The headlights, with
their upper and lower beams, are an example of this type of switch.
Again, in some cases, such as the courtesy lights, several switches
may be connected in parallel so that any switch may be used to turn
on the lights.
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