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ELECTRICAL SYSTEM - TM-9-2320-279-20-10228
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TM-9-2320-279-20-1 5-Ton 6x6 M39 Series Trucks (Multifuel) Manual
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HEATER FAN MOTOR WILL NOT OPERATE
TM 9-2320-279-20-l
Troubleshooting Malfunctions (Cont)
Table 2-9 Troubleshooting (Cont)
Malfunction
Test or Inspection
Corrective Action
ENGINE BRAKE WILL NOT OPERATE.
Remove circuit breaker compartment cover (para 7-43). Check circuit breaker No.9 for
Step 1.
continuity (fig. 2-2).
Replace defective circuit breaker No. 9 (para 7-43).
Check for 24 volts at input terminal on circuit breaker No. 9 (para 7-43).
Step 2.
If 24 volts is not present, trace wiring and find problem. Refer to FO-1, Electrical
Diagram.
Check for loose or broken wires and connections. Refer to FO-1, Electrical Diagram.
Step 3
Tighten loose connections, repair broken wires and connections.
Check engine brake wiring for continuity.
Step 4.
Repair defective wires.
Remove dash side panel, check engine brake ON/OFF switch for continuity.
Step 5.
Replace engine brake ON/OFF switch if defective (para 7-39).
Check engine brake HIGH/LOW switch for continuity.
Step 6.
Replace if defective (para 7-39).
If problem is not solved, notify the supervisor.
Step 7.
Change 3

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