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 760 of 1313
STARTER MOTOR INOPERATIVE; NO SOLENOID THUMP - Continued
STEP
8.
IS THERE CONTINUITY BETWEEN PIN D OF THE HARNESS CONNECTOR AND CONTACT END OF 5B
AT START SWITCH?
a.
Connect lead 74 to starter solenoid.
b.
Disconnect lead 5B (pin B) at start switch.
T0714DAA
A
B
C
D
E
F
G
HARNESS
CONNECTOR
PROTECTIVE
CONTROL
BOX
VOM
54
5B
498
START
SWITCH
TO
PROTECTIVE
CONTROL
BOX
5A
TO CIRCUIT
BREAKER
R
B
S
Figure 8.
Start Switch Wire 5B.
c.
Connect multimeter red lead to harness connector, pin D (lead 5A/5B). Refer to point to point schematics.
d.
Connect multimeter black lead to contact end of 5B at start switch.
e.
Meter reading should be less than 20 ohms.
CONDITION/INDICATION
IS THERE CONTINUITY BETWEEN PIN D OF THE HARNESS CONNECTOR AND CONTACT END OF 5B
AT START SWITCH?
DECISION
NO - Repair wire 5A/5B (Volume 3, WP
0352). Go to Step (15) to verify problem is solved.
YES - Go to Step (9).
TM 9-2320-272-23-1
0088
0088-9
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