Table 2-4. Electrical Troubleshooting (Cont)
TEST OR INSPECTION
HEATER (GAS-PARTICULATE FILTER UNIT)
20. WILL NOT START
Trace circuit. (See wiring diagram F-23)
HEATER (AMBULANCE AND WINTERIZATION KIT)
21. WILL NOT SHUT OFF
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.
Disconnecting wiring harness will shut off heater.
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
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
22. WILL NOT START
Check fuel shutoff petcock on fuel inlet line.
Open if closed.