TM-9-2320-272-24-1

TRUCK, 5-TON, 6X6, M939, M939A1, AND M939A2 SERIES TRUCKS (DIESEL)

TECHNICAL MANUAL; UNIT, DIRECT SUPPORT, AND GENERAL SUPPORT MAINTENANCE MANUAL; VOLUME 1 OF 4

JUNE 1998

TM-9-2320-272-24-1 - Page 185 of 1015

TM 9-2320-272-24-1

Table 2-3. Electrical Troubleshooting (Contd).

MALFUNCTION

TEST OR INSPECTION

CORRECTIVE ACTION

BATTERY SYSTEM

2. BATTERlES ARE HOT, ELECTROLYTE IS BOILING, OR EXCESSIVE USE OF WATER

NOTE

If STE/ICE is available, perform NG50 - Charging Circuit Tests

(para. 2-24).

Check electrolyte temperature and specific gravity and note reading (TM 9-6140-200-14).

a.

If temperature is over 120°F (49°C) and specific gravity is 1.280 or greater, batteries

are being overcharged. Go to generating system troubleshooting (malfunction 9,

test 1).

b.

If battery temperature is over 120°F (49°C), but specific gravity is 1.236-1.260,

recharge batteries (TM 9-6 140-200-14).

END OF TESTING!

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