Generating System Operation - TM-9-2320-272-24-10061

TM-9-2320-272-24-1 Truck 5-Ton 6x6 M939 M939A1 M939A2 Series Trucks (Diesel) Manual
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TM 9-2320-272-24-1

1-22. ELECTRICAL SYSTEMS OPERATION (Contd)

d. Generating System Operation.

The generating system is identical for all vehicles covered in this manual and consists of the following

major components and circuitry:

Key Item and Function

6 VOLTMETER - Indicates electrical system voltage. It is connected to the electrical system through

circuit 27.

7 ALTERNATOR - Rated at 26-30 volts, 60 amperes, the alternator assists and recharges batteries

during operation. A l00-ampere model is available as a kit.

8 CIRCUIT 3 - Provides a ground circuit to alternator.

9 CIRCUIT 566 - Controls a relay in protective control box that prevents starter from reactivating

while engine is running.

10 CIRCUIT 568 - Senses system voltage and excites the alternator field.

11 PROTECTIVE CONTROL BOX - Connects circuit 5 to 81 to power the electrical system and

charge the batteries.

12 CIRCUIT 5 - Conducts alternator output to charge batteries and maintain vehicle voltage.

13 BATTERY SWITCH - Closes relay in protective control box that connects battery circuits.

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