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 736 of 1313
ALL VEHICLE ELECTRICAL SYSTEMS INOPERATIVE - Continued
PROTECTIVE
CONTROL BOX
T1097DAA
PROTECTIVE
CONTROL BOX
PROTECTIVE
CONTROL
CONNECTOR
A
B
C
D
E
F
G
Figure 6.
Protection Control Box Test.
d.
Connect jumper wire between circuit 81 connector, terminal A, and protective control box connector,
terminal A.
e.
Connect multimeter red lead to protective control box pin D.
f.
Connect multimeter black lead to protective control box pin C.
g.
Place battery switch to ON position.
h.
Meter reading should be less than 200 ohms.
CONDITION/INDICATION
IS THERE CONTINUITY BETWEEN PIN C AND PIN D OF THE PROTECTIVE CONTROL BOX?
DECISION
YES - Notify supervisor. Action may not be possible at this level of maintenance.
NO - Replace protective control box (Volume 2, WP
0319). Go to Step (7) to verify problem is solved.
TM 9-2320-272-23-1
0085
0085-7
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