Lesson 1/Learning Event 2
Learning Event 2:
DESCRIBE THE PRINCIPLES, CONSTRUCTION, AND OPERATION OF AC CHARGING
SYSTEMS
INTRODUCTION TO ALTERNATORS
Most military vehicles are now equipped with an AC charging system. The reason for changing to
the AC system is that an alternator is capable of producing a higher voltage at idle speed, whereas a
DC generator produces very little voltage at idle speed. Many military vehicles are equipped with
radios, firing devices, and other high-current-drawing equipment. When this equipment is in
operation and the vehicle's engine is at a low RPM, a DC generator will not produce the required
current and voltage to keep the batteries charged and supply the current required to operate the
accessories properly.
THE BASIC ALTERNATOR
FIGURE 8. TYPICAL ALTERNATOR.
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