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 222 of 1015

TM 9-2320-272-24-1

Table 2-3. Electrical Troubleshooting (Contd).

MALFUNCTION

TEST OR INSPECTION

CORRECTIVE ACTION

Test 2. Check trailer receptacle ground.

Step 1.

Set multimeter on Rx1 for continuity reading.

CAUTION

Lead 15 or wire 15 is hot whenever the batteries are connected.

Step 2.

Connect multimeter positive lead to lead 90 at socket (receptacle terminal L and then D)

and negative lead to good ground. Multimeter should indicate continuity from both

terminal L and D to ground.

a. If continuity was indicated, perform malfunction 16, test 4.

b. If continuity was not indicated, repair broken lead 90 (para. 3-131).

END OF TESTING!

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