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 237 of 1015

TM 9-2320-272-24-1

Table 2-3. Electrical Troubleshooting (Contd).

MALFUNCTION

TEST OR INSPECTION

CORRECTIVE ACTION

28. ONE GAUGE INOPERATlVE

NOTE

If STE/ICE is available, perform NG31 - Gauge Test (para. 2-24).

Test individual gauge voltage.

Step 1.

Step 2.

Step 3.

Step 4.

Step 5.

Step 6.

Place battery switch to OFF position.

Remove instrument cluster panel (para. 3-83).

Disconnect lead 27 from inoperative gauge.

Place battery switch to ON position.

Set multimeter to 50-volt range.

Connect multimeter negative lead to vehicle chassis ground and positive lead to

disconnected lead 27. Multimeter should indicate battery voltage.

a.

If battery voltage is not indicated, replace instrument cluster wiring harness

(para. 3-130).

b.

If battery voltage is indicated, replace defective gauge (para. 3-86).

END OF TESTING!

2-149