TM-9-2320-272-23-2
TRUCK, 5-TON, 6X6, M939, M939A1, AND M939A2 SERIES TRUCKS (DIESEL)
TECHNICAL MANUAL; FIELD MAINTENANCE MANUAL; VOLUME 2 OF 5
SEPTEMBER 2012
TM-9-2320-272-23-2 - Page 313 of 1417
NG80: STARTER CIRCUIT TESTS - Continued
STEP
11.
Perform starter solenoid voltage test.
a.
Dial 70 into TEST SELECT and press TEST.
Table
7.
Starter Solenoid Voltage Test.
Test NO.
Test
70
Starter Solenoid Voltage
b.
Crank engine and observe displayed voltage.
Table
8.
Starter Voltage.
Vehicle
Starter Solenoid Voltage
M939/A1
17 Volts
M939A2
18.5 Volts
CONDITION/INDICATION
Is starter solenoid voltage above minimum starter solenoid voltage?
DECISION
YES - If starter resistance was high in Step (3), check positive battery cables
(WP
0349) and connections to
starter solenoid. Repair if necessary. If OK replace solenoid. If GO message occurred during Start Circuit
Resistance Test in Step (3), check switches and wiring to solenoid. If OK, Replace starter motor (WP
0303).
After completing repair, rerun GO-Chain tests to verify problem is solved and no other problem exists.
NO - Go to Step (12).
TM 9-2320-272-23-2
0202
0202-8
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