TM-9-2320-272-10
TRUCK, 5-TON, 6X6, M939, M939A1, AND M939A2 SERIES TRUCKS (DIESEL)
TECHNICAL MANUAL; OPERATOR'S MANUAL
SEPTEMBER 2004
CHANGE 2
TM-9-2320-272-10 - Page 46 of 481
TM 9-2320-272-10
1-29
1-17. CONTROL SYSTEM OPERATION (Contd)
PROTECTIVE CONTROL BOX
– Prevents reengagement of starter motor
once engine is running.
BATTERIES
– Provide 24-volt electrical current for energizing electrical
circuits.
STARTER SOLENOID
– Relays 24-volt battery power to energize starter
motor.
STARTER MOTOR
– When energized, it converts electrical energy to
mechanical power as it engages the flywheel to crank engine.
ETHER START CYLINDER
– Stores ether used for cold weather starting.
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