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Table 2-3. Electrical Troubleshooting (Contd) - TM-9-2320-272-24-10263

TM-9-2320-272-24-1 Truck 5-Ton 6x6 M939 M939A1 M939A2 Series Trucks (Diesel) Manual
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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.  Disconnect quick-disconnect from lead 568.
2. Disconnect voltage regulator harness connector at voltage regulator.
Step
3.  Disconnect voltage regulator harness at starter motor and starter solenoid.
Step
4.  Connect multimeter positive lead to contact end of lead 81 at starter solenoid and
Step
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).
Step 5.  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).
Step 6.  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).
Step 7.  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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