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 187 of 1015

TM 9-2320-272-24-1

Table 2-3. Electrical Troubleshooting (Contd).

MALFUNCTION

TEST OR INSPECTION

CORRECTIVE ACTION

Step 1.

Set multimeter to 50-volt range.

Step 2.

Connect multimeter positive lead to starter solenoid terminal 6 and negative lead to

ground strap. Multimeter should indicate voltage.

Step 3.

Place headlight and battery switch on ON position for 15 seconds (headlights on high

beam). Multimeter should register 1-volt drop from step 2 reading.

Recharge batteries when voltage reading is low (TM 9-6140-200-14).

END OF TESTING!

5. ALL VEHICLE ELECTRICAL SYSTEMS INOPERATIVE

Test 1. Check connection of battery cables.

Ensure battery cables are correctly connected to batteries. (See wiring diagram in Appendix H.)

If not correctly connected, secure battery cables (para. 3-124 or 3-126).

Test 2. Inspect batteries (malfunction 4, test 1).

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