7. DIMMER SWITCH
8. BLACKOUT DRIVE LIGHT
BLACKOUT AND SERVICE TAILLIGHT
9. BLACKOUT SERVICE LIGHT
10. INSTRUMENT CLUSTER
BLACKOUT TAILLIGHT, SERVICE TAILLIGHT,
11. HORN BUTTON
AND SERVICE STOPLIGHT
6. LIGHT SWITCH
Figure 11-13. Typical Automotive Circuit.
(1) Any break in the circuit (such as a burned-
operated components) connected in separate branches.
out light bulb) will render the entire circuit inoperative.
In a parallel circuit, each component receives full voltage
from the source. The following characteristics of parallel
(2) The current (amperage) will be constant
circuits are important.
throughout the circuit.
(1) The total resistance of the circuit will always
(3) The total resistance of the circuit is equal to
be less than the resistance of any individual component.
the sum of the individual resistances.
(2) The disconnection or burning out of any
(4) The total voltage of the circuit is equal to the
individual component in the circuit will not affect the
of the individual voltage drops across each
operation of the others.
(3) The current will divide itself among the
d. Parallel Circuits (B, Fig. 11-14). A parallel circuit
circuit branches according to the resistances of
consists of two or more resistance units (electrically