TM 9-2320-280-20-1
Change 1
1-42.1
1-23.1. GENERATING SYSTEM OPERATION (100 AMPERE DUAL VOLTAGE ALTERNATOR)
The 100-ampere dual voltage generating system maintains battery charge and provides electrical power to
operate vehicle circuits. Major components of the generating system are:
B
ALTERNATOR (100 AMPERE)– Is rated at 28 volts at 100 amperes and 14 volts at 50 amperes
with external regulator. The alternator assists and recharges the vehicle batteries during operation.
A
BATTERY GAUGE – Indicates electrical system voltage. It is connected to the electrical system
through circuit 567.
C
PROTECTIVE CONTROL BOX / DISTRIBUTION BOX* – Protects the vehicle electric system in
the event battery polarity is reversed. Provides load dump, glow plug operation, and interfacing of
engine and body harnesses.
D
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.
E
BATTERIES – Two 12-volt batteries are connected in a series to provide 24 volts to start vehicle and
assist alternator during operation.
G
POSITIVE CABLE 6 – Provides 28-volt alternator output to maintain charge across two batteries.
H
F
POSITIVE CABLE 68A – Provides 16-volt alternator output to maintain charge across the lower
battery.
CIRCUIT 568 – Senses vehicle voltage, and activates the field current in the alternator circuit to
alternator.
CIRCUIT 3 – Connects to negative stud on alternator with engine ground strap to provide a ground
circuit to alternator.
I
* Distribution box provides same function as protective control box except distribution box does not
protect against reversal of battery polarity.
