TM-9-2320-361-24-1
2-1/2 TON, 6X6, M44A2 SERIES TRUCKS
TECHNICAL MANUAL; FIELD AND SUSTAINMENT MAINTENANCE PART 1 OF 2
AUGUST 2006
TM-9-2320-361-24-1 - Page 211 of 1176
TM 9-2320-361-24-1
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BATTERY AND CHARGING SYSTEM TROUBLESHOOTING (Contd)
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
1. NO ALTERNATOR
OUTPUT
CAUTION
Do not puncture waterproof cover on
cable between alternator and voltage
regulator to perform voltage checks.
The cable will be unserviceable.
7. Use multimeter to check
battery voltage. Normal
charging on batteries is
28.0 ± 0.2 VDC.
8. Check voltage regulator
stability.
1. If battery voltage measures between
24.0 and 26.0 VDC and alternator has
very weak or no output, replace
alternator (WP 0085 00).
2. If battery voltage measures between
26.0 and 30.0 VDC, adjust voltage
regulator (if equipped with adjustment
screw). If charging voltage across
batteries cannot be adjusted to 28.0 ±
0.2 VDC, replace voltage regulator
(WP 0448 00).
3. If charging voltage across batteries
can be adjusted to 28.0 ± 0.2 VDC., go
to test step 8.
Go to WP 0012 00, table 2, malfunction 1,
test 2, step 7.
2. BATTERIES NOT
CHARGING
PROPERLY
NOTE
If STE/ICE-R is available, perform
NG 50 Charging Circuit Tests
(WP 0018 00).
Test 1. Check for loose or missing
alternator belts.
Test 2. Test battery voltage.
1. Adjust loose belts (WP 0084 00).
2. Replace broken or missing belts
(WP 0084 00).
Go to WP 0012 00, table 1, malfunction 1,
test 1.
3. BATTERIES HOT OR
BOILING,
CORRECTED
SPECIFIC GRAVITY
OF ALL CELLS IS
1.280
NOTE
If STE/ICE-R is available, perform
NG 50 Charging Circuit Tests
(WP 0018 00).
Test charging voltage (WP 0012 00,
table 4, malfunction 1, test 2).
Replace defective batteries as necessary
(WP 0127 00).
4. BATTERIES USE
EXCESSIVE WATER
NOTE
If STE/ICE-R is available, perform
NG 50 Charging Circuit Tests
(WP 0018 00).
Test charging voltage (WP 0012 00,
table 4, malfunction 1, test 2).
Replace defective batteries as necessary
(WP 0127 00).
5. BATTERIES RUN
DOWN IN
OPERATION
NOTE
If STE/ICE-R is available, perform
NG 50 Charging Circuit Tests
(WP 0018 00).
Test 1. Check for loose or missing
alternator belts.
Test 2. Test charging voltage
(WP 0012 00, table 4,
malfunction 1, test 2).
1. Adjust loose belts (WP 0084 00).
2. Replace broken or missing belts
(WP 0084 00).
Table 4. Charging System (100 Amp) Troubleshooting Procedure (Contd).
END OF WORK PACKAGE
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