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 735 of 1313
ALL VEHICLE ELECTRICAL SYSTEMS INOPERATIVE - Continued
STEP
5.
ARE BATTERIES SPECIFIC GRAVITY READINGS CORRECT?
a.
Perform a specific gravity test (TM 9-6140-200-14).
T1053DAA
Figure 5.
Specific Gravity Test.
b.
Batteries must test 1.225 or greater, temperature corrected.
c.
Each cell in a battery must test within 25 points of the other cells.
d.
If any battery or batteries do not meet requirements, recharge as required.
e.
Perform specific gravity test again.
CONDITION/INDICATION
ARE BATTERIES SPECIFIC GRAVITY READINGS CORRECT?
DECISION
YES - Go to Step (6).
NO - Replace defective battery (Volume 2, WP
0346). Go to Step (7) to verify problem is solved.
STEP
6.
IS THERE CONTINUITY BETWEEN PIN C AND PIN D OF THE PROTECTIVE CONTROL BOX?
a.
Place battery switch to OFF position.
b.
Disconnect circuit 81 connector from protective control box. Refer to point to point schematics.
c.
Set up multimeter to read ohms.
TM 9-2320-272-23-1
0085
0085-6
Back to Top
