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 312 of 1417
NG80: STARTER CIRCUIT TESTS - Continued
STEP
10.
Perform starter negative cable drop.
a.
Dial 69 or 89 into TEST SELECT and press TEST.
Table
6.
Starter Negative Cable Drop Tests.
Test NO.
Test
69, 89*
Starter Negative Cable Drop
* for M939/A1
b.
Crank engine and observe displayed voltage.
CONDITION/INDICATION
Is cable drop less than limit on VTC?
DECISION
YES - Replace starter motor (WP
0303). After completing repair, rerun GO-Chain tests to verify problem is
solved and no other problem exists.
NO - Inspect and clean all ground cables from starter, engine, and batteries, and check for integrity. Repair as
necessary. After completing repair, rerun GO-Chain tests to verify problem is solved and no other problem exists.
TM 9-2320-272-23-2
0202
0202-7
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