TM-9-2320-280-20-1
TRUCK, UTILITY: M998 SERIES
TECHNICAL MANUAL; UNIT MAINTENANCE; VOLUME 1 OF 3
JANUARY 1996
TM-9-2320-280-20-1 - Page 72 of 888
TM 9-2320-280-20-1
1-23. GENERATING SYSTEM OPERATION (200 AMPERE ALTERNATOR)
The 200 ampere generating system maintains battery charge and provides electrical power to operate
vehicle circuits. Major components of the generating system are:
BATTERY GAUGE
- Indicates electrical system voltage. It is connected to the electrical system
through circuit 567.
ALTERNATOR (200 AMPERE)
- Is rated at 28 volts, 200 amperes, with external regulator. The
alternator assists and recharges the vehicle batteries during operation.
CIRCUIT 568/CIRCUIT 5 (ALTERNATOR A0013036AA ONLY)
- Senses vehicle voltage, and
activates the field current in the alternator to generate current.
PROTECTIVE CONTROL BOX
- Protects the vehicle electrical system in the event battery
polarity is reversed.
CIRCUIT 2
- Sends AC signal, indicating alternator shaft rpm, to frequency switch in protective
control box to prevent operation of starter solenoid when engine is running.
BATTERIES
- Two 12-volt batteries are connected in a series to provide 24 volts to start vehicle
and assist alternator during operation.
POSITIVE CABLE
- Transmits alternator output to maintain battery charge. A fuse at the
alternator power stud will prevent damage to alternator if battery polarity is reversed.
CIRCUIT 3
- Connects to negative stud on alternator with engine ground strap to provide a ground
circuit to alternator.
1-42
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