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 226 of 1015

TM 9-2320-272-24-1

Table 2-3. Electrical Troubleshooting (Contd).

MALFUNCTION

TEST OR INSPECTION

CORRECTIVE ACTION

24. NO LIGHTS OPERATE WITH DIRECTIONAL SIGNAL CONTROL LEVER IN ANY POSlTlON

Test 1. Test control unit voltage feed.

Step 1.

Place battery switch to OFF position.

Step 2.

Disconnect connector control unit harness from directional signal control unit.

Step 3.

Place battery switch to ON position.

Step 4.

Place light switch to STOP TURN position.

Step 5.

Set multimeter to 50-volt range.

Step 6.

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

connector terminal point G.

a.

Multimeter should indicate battery voltage. If battery voltage is not indicated,

perform malfunction 16, test 4.

b.

If battery voltage is indicated, go to test 2.

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