TM-9-2320-272-23-1
TRUCK, 5-TON, 6X6, M939, M939A1, AND M939A2 SERIES TRUCKS (DIESEL)
TECHNICAL MANUAL; FIELD MAINTENANCE MANUAL; VOLUME 1 OF 5
SEPTEMBER 2012
TM-9-2320-272-23-1 - Page 719 of 1313
ENGINE AND VEHICLE ELECTRICAL SYSTEMS MALFUNCTIONING - Continued
STEP
2.
IS PROTECTIVE CONTROL BOX FAULTY?
T1106DAA
PROTECTIVE
CONTROL
BOX
PROTECTIVE
CONTROL
CONNECTOR
Figure 1.
Protective Control Box.
NOTE
If thug is heard when connector is disconnected, protective control box is faulty.
a.
Unplug harness connector from protective control box.
b.
Listen for protective control box to reset.
CONDITION/INDICATION
IS PROTECTIVE CONTROL BOX FAULTY?
DECISION
YES - Replace protective control box (Volume 2, WP
0319). Go to Step (3) to verify problem is solved.
NO - Perform No Or Low Alternator Output troubleshooting (WP
0089).
TM 9-2320-272-23-1
0083
0083-2
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