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 320 of 1417
NG81: BATTERY TESTS - Continued
STEP
5.
Check batteries.
a.
If display shows GO, there is a bad connection in starter circuit. Check cables and connections to starter
and retest. If display still shows GO, then you may have a very poor battery in series pair being tested.
Test other battery in the pair.
b.
If display shows .9.9.9.9, there may be a bad connection on battery being tested. Clean and tighten
connections on battery and retest.
c.
If display shows E013, - - - -, or .9.9.9.9, the battery being tested may be in a discharged state. Check
battery electrolyte level, charge battery , and then retest.
NOTE
After completing repair rerun GO-Chain tests to verify problem is fixed and no other
problems exists.
d.
If display shows E013, - - - -, or .9.9.9.9 after battery has been charged, replace
battery (WP
0346).
CONDITION/INDICATION
DECISION
STEP
6.
Test results.
Compare reading with resistance change given below.
Table
2.
Maximum Resistance Change.
Vehicle
Maximum Resistance Change
All
25.0 Milliohms/Second
CONDITION/INDICATION
Is battery resistance change less than above limit?
DECISION
YES - Go to Step (7).
NO - Go to Step (9).
TM 9-2320-272-23-2
0203
0203-5
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