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 210 of 1176

TM 9-2320-361-24-1

0012 00

0012 00-26

BATTERY AND CHARGING SYSTEM TROUBLESHOOTING (Contd)

MALFUNCTION

TEST OR INSPECTION

CORRECTIVE ACTION

1. NO ALTERNATOR

OUTPUT

Test 2. Test charging system output

voltage.

NOTE

• Voltage regulators in both the 100 amp

and 60 amp charging systems regulate

battery voltage to 28.0 ± 0.2 VDC.

• The 100 amp voltage regulator is

separate from the 100 amp alternator.

• Battery voltage fluctuations are not to

go above 28.5 VDC or below 27.5 VDC

as headlights are turned on, off, and on

with engine running at 1200 RPM.

• For test purposes only, charging voltage

across batteries can be varied between

26.0 and 30. 0 VDC with engine

running at 1200 RPM and headlights

off.

1. Turn off engine.

2. Open door of battery

compartment. Loosen two

thumbscrews and slide batteries

onto running board (WP 0127 00).

3. Use multimeter to check battery

for voltage.

4. Start engine (TM 9-2320-361-10).

5. Set engine speed at 1200 RPM.

6. Turn on vehicle headlights and

accessories.

Table 4. Charging System (100 Amp) Troubleshooting Procedure (Contd).

TEST 2

STEP 7

BATTERIES

THUMBSCREWS

RUNNING

BOARD

~

~