Lesson 4/Learning Event 1
LESSON 4
ACCESSORY SYSTEMS
TASK
Describe the principles of vehicle electrical accessory systems.
CONDITIONS
Given information on construction and operation of wiring systems, lighting systems, instruments,
and gages.
STANDARDS
Answer 70 percent of the multiple-choice test items covering accessory systems.
REFERENCES
TM 9-8000
Learning Event 1:
DESCRIBE PURPOSE AND CONSTRUCTION OF AUTOMOTIVE WIRING
GENERAL
Electrical power and control signals must be delivered to electrical devices reliably and safely so that
electrical system functions are not impaired or converted to hazards. This goal is accomplished
through careful circuit design, prudent component selection, and practical equipment location.
The list of common equipment used to fulfill power distribution requirements in military vehicles
includes single-conductor cable, multiconductor cable, bus bars, terminal blocks, terminals, and
connectors. To facilitate successful application of such equipment, guidelines for the design of
main power distribution circuits, conductor selection and routing practices, wiring and cable
assembly requirements, human factors, environmental considerations, circuit protection
requirements, and circuit identification techniques are discussed in this section. Included are the
general power distribution considerations necessary for effecting good performance, economy, and
safety in a vehicle electrical system design.
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