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.
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