TM 9-2320-289-20Table 2-4. Electrical Troubleshooting (Con’t)MALFUNCTIONTEST OR INSPECTIONCORRECTIVE ACTIONHEATER (GAS-PARTICULATE FILTER UNIT)20. WILL NOT STARTStep 1.Trace circuit. (See wiring diagram F-23)HEATER (AMBULANCE AND WINTERIZATION KIT)21. WILL NOT SHUT OFFStep 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.NOTEDisconnecting wiring harness will shut off heater.Step 2.Set all controls for normal starting of heater. (See TM 9-2320-289-10) Disconnectwiring harness from heater control box. Check for voltage at terminal “A” of heatercontrol box.If there is voltage, replace switch (cab heater or engine coolant heater) (seeparagraph 11-3) or heater control box (ambulance heater or cargocompartment heater) (see paragraph 10-35 or 11-20).If there is no voltage, replace heater. (See paragraph 10-36, 11-8, 11-16, or11-21)22. WILL NOT STARTStep 1.Check fuel shutoff petcock on fuel inlet line.Open if closed.2-66
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