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 200 of 1015

TM 9-2320-272-24-1

Table 2-3. Electrical Troubleshooting (Cantd).

MALFUNCTION

TEST OR INSPECTION

CORRECTIVE ACTION

Test 5. Test continuity of protective control box harness.

Step 1.

Dirconnect battery ground cables (para. 3-126).

Step 2.

Set multimeter to RX1 for continuity reading.

Step 3.

Disconnect lead 74 at starter solenoid.

Step 4.

Connect multimeter positive lead to pin B (lead 74) at harness connector and negative

lead to lead 74 at starter solenoid.

a.

Multimeter should indicate continuity. If continuity is not indicated, repair broken

lead 74 (para. 3-131).

b. If continuity is indicated, go to step 5.

Step 5.

Connect lead 74 at starter solenoid.

2-112