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ALL VEHICLE ELECTRICAL SYSTEMS INOPERATIVE - TM-9-2320-272-24-10189
STARTING SYSTEM - TM-9-2320-272-24-10191

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
NOTE
If STE/ICE is available, perform NG81 - Battery Tests
(para. 2-24).
Test 3.
Check protective control box continuity from pin C to pin D.
Step
1.  Place battery switch to OFF position.
Step
2. Disconnect harness connector from protective control box.
Step
3.  Set multimeter to RX1 for continuity reading.
Step
4.  Apply battery voltage to pin A of control box.
Step
5. Touch negative multimeter lead to pin C and positive lead to pin D on control box.
a. Continuity should be indicated between pins C and D.
b. If continuity is not indicated, replace protective control box (para. 3-115).
END OF TESTING!
2-100






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