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 761 of 1313
STARTER MOTOR INOPERATIVE; NO SOLENOID THUMP - Continued
STEP
9.
IS THERE CONTINUITY BETWEEN PINS B AND S OF THE START SWITCH?
a.
Disconnect lead 5B (pin B) and lead 498 (pin S) at start switch.
T0715DAA
R
B
S
54
5B
498
VOM
Figure 9.
Start Switch.
b.
Connect multimeter red lead to pin B of the start switch. Refer to point to point schematics.
c.
Connect multimeter black lead to pin S of the start switch.
d.
Position and hold start switch in the START position.
e.
Meter reading should be less than 20 ohms.
CONDITION/INDICATION
IS THERE CONTINUITY BETWEEN PINS B AND S OF THE START SWITCH?
DECISION
NO - Replace start switch (Volume 2, WP
0307). Go to Step (15) to verify problem is solved.
YES - Go to Step (10).
STEP
10.
IS THERE CONTINUITY BETWEEN CONTACT END OF LEAD 498 AT START SWITCH AND CONTACT
END OF LEAD 498 AT NEUTRAL START SWITCH?
a.
Reconnect lead 5B to start switch (pin B).
b.
Set parking brake.
c.
Disconnect lead 498 at start switch.
d.
Disconnect lead 498 at neutral start switch.
TM 9-2320-272-23-1
0088
0088-10
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