TM 9-2540-205-24&P
ORGANIZATIONAL TROUBLESHOOTING - Continued
STEWART-WARNER 10560C24, 10560M, 10560M24B1, 10560G
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
1. HEATER DOES NOT START
Step 1. Check for blocked air inlet or exhaust pipe.
Clear all passages to and from the heater (refer to applicable vehicle
technical manuals).
Step 2. Check for adequate fuel supply.
a. Bleeding the fuel valve will ensure the heater is receiving fuel (page
2-57).
b. Troubleshoot vehicle fuel system (refer to applicable vehicle technical
manuals).
Step 3. Check for proper voltage requirements as follows:
a. Check terminal strip (5) for damage (page 2-45).
b. Disconnect control box cable to heater.
c. Using multimeter set to read dc voltage, put red probe on terminals of
control box cable and black probe to good ground.
If multimeter reads anything other than 19 volts to 28 volts,
troubleshoot vehicle electrical system (refer to applicable vehicle
technical manuals).
Step 4. Remove guard (page 2-42).
Step 5. Check for flooded heater (page 2-29).
Step 6. Check for wet pulsed fuel metering valve circuit board (1) (10560M24B1 and 10560G).
a. If wet, dry thoroughly.
b. Try to start heater (page 2-60).
NOTE
10560M and 10560M24B1 heaters get their intake air from outside the vehicle,
Choke these heaters by having someone stand outside the vehicle covering the grill
with hand. The 10560C24 and 10560G get air intake from inside the vehicle.
Step 7. Choke heater as follows:
a. Restrict the air intake by placing hand over intake grill.
b. Turn heater on for 30 seconds.
c. Turn heater off, and wait five seconds.
d. Repeat steps b and c five times or until heater starts.
If heater starts, but needs to be choked often, notify Direct Support
Maintenance.
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