21. WILL NOT SHUT OFF

Table 2-4. Electrical Troubleshooting (Cont) - TM-9-2320-289-20_115

Table 2-4. Electrical Troubleshooting (Cont) - TM-9-2320-289-20_117

/.25ton/TM-9-2320-289-20 CUCV Series Trucks at Unit level Manual
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TM 9-2320-289-20 Table 2-4. Electrical Troubleshooting (Con’t) MALFUNCTION TEST OR INSPECTION CORRECTIVE ACTION HEATER (GAS-PARTICULATE FILTER UNIT) 20. WILL NOT START Step 1. Trace circuit. (See wiring diagram F-23) HEATER (AMBULANCE AND WINTERIZATION KIT) 21. WILL NOT SHUT OFF Step 1. Set run-start or on-off switch to “OFF” position. If heater runs for less than 5 minutes, heater is good. If heater runs for more than 5 minutes, perform step 2. NOTE Disconnecting wiring harness will shut off heater. Step 2. Set all controls for normal starting of heater. (See TM 9-2320-289-10) Disconnect wiring harness from heater control box. Check for voltage at terminal “A” of heater control box. If there is voltage, replace switch (cab heater or engine coolant heater) (see paragraph 11-3) or heater control box (ambulance heater or cargo compartment heater) (see paragraph 10-35 or 11-20). If there is no voltage, replace heater. (See paragraph 10-36, 11-8, 11-16, or 11-21) 22. WILL NOT START Step 1. Check fuel shutoff petcock on fuel inlet line. Open if closed. 2-66

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