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 260 of 1015

TM 9-2320-272-24-1

Table 2-3. Electrical Troubleshooting (Contd).

MALFUNCTION

TEST OR INSPECTION

CORRECTIVE ACTION

Test 3. Test continuity of starter harness.

Step 1.

Step 2.

Step 3.

Step 4.

Step 5.

Step 6.

Step 7.

Disconnect quick-disconnect from lead 568.

Disconnect voltage regulator harness connector at voltage regulator.

Disconnect voltage regulator harness at starter motor and starter solenoid.

Connect multimeter positive lead to contact end of lead 81 at starter solenoid and

negative lead to pin B at voltage regulator harness connector. Continuity should be

present.

a. If continuity is present, go to step 5.

b.

If continuity is not present, replace voltage regulator harness (para. 3-131).

Connect multimeter positive lead to contact end of lead 81 at starter solenoid and

negative lead to pin A at voltage regulator harness connector. Continuity should be

present.

a.

If continuity is present, go to step 6.

b.

If continuity is not present, replace voltage regulator harness (para. 3-131).

Connect multimeter negative lead to contact end of pin C at voltage regulator harness

connector and positive lead to contact end of lead at starter motor. Continuity should be

present.

a. If continuity is present, go to step 7.

b.

If continuity is not present, replace voltage regulator harness (para. 3-131).

Connect multimeter positive lead to contact end of lead 568 and negative lead to contact

end of pin F at voltage regulator harness connector. Continuity should be present.

a. If continuity is present, notify DS maintenance.

b.

If continuity is not present, replace voltage regulator harness (para. 3-131).

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