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 316 of 1417
FIELD MAINTENANCE
NG81: BATTERY TESTS
INITIAL SETUP:
Personnel Required
(2)
References
TM 9-4910-571-12&P
WP
0346
TROUBLESHOOTING PROCEDURE
NG81: BATTERY TESTS
NOTE
Each battery is best tested individually. During this test, supply must be shut off to keep engine
from starting.
STEP
1.
Perform offset test.
a.
Connect test probe cable W2 to J4 on VTM.
b.
Short red and black clips leads of W2 together.
c.
Dial 89 into TEST SELECT.
d.
Press and hold TEST until CAL appears on display.
T0021DAA
Figure 1.
CAL Prompting Message.
e.
Release TEST.
f.
Wait for offset value to appear on display.
CONDITION/INDICATION
Is offset value within limits of -6.8 to +6.8?
DECISION
YES - Go to Step (2).
NO - Proceed to TM 9-4910-571-12&P for offset fault isolation.
TM 9-2320-272-23-2
0203
0203-1
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