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 763 of 1313
STARTER MOTOR INOPERATIVE; NO SOLENOID THUMP - Continued
STEP
11.
IS THERE CONTINUITY BETWEEN NEUTRAL START SWITCH CONTACT END OF LEAD 499 AND
NEUTRAL START SWITCH CONTACT END OF LEAD 498?
a.
Reconnect lead 498 to start switch (pin S).
b.
Disconnect lead 499 at neutral start switch.
c.
Ensure transmission is in neutral.
T0717DAA
NEUTRAL START
SWITCH
499
498
VOM
Figure 11.
Neutral Start Switch.
d.
Connect multimeter red lead to neutral start switch contact end of lead 499. Refer to point to point
schematics.
e.
Connect multimeter black lead to neutral start switch contact end of lead 498.
f.
Meter reading should be less than 20 ohms.
CONDITION/INDICATION
IS THERE CONTINUITY BETWEEN NEUTRAL START SWITCH CONTACT END OF LEAD 499 AND
NEUTRAL START SWITCH CONTACT END OF LEAD 498?
DECISION
NO - Replace neutral start switch (Volume 3, WP
0366). Go to Step (15) to verify problem is solved.
YES - Go to Step (12).
TM 9-2320-272-23-1
0088
0088-12
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