TM 9-2320-260-20
Table 2-4. Electrical Troubleshooting (Contd).
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
38. PERSONNEL FUEL BURNING HEATER INOPERATIVE
Test 1. Check horn operation.
Push horn button.
a. If horn is operational, voltage is present at input of personnel heater circuit breaker.
Go to test 2.
b. If horn fails to operate, go to malfunction 35.
Test 2. Test lead 400 for power input to heater control box.
Step 1. Set multimeter to a range that will measure 24 volts.
Step 2. Disconnect lead 400 from heater control box.
Step 3. Touch multimeter positive lead to contact end of lead 400.
Step 4. Touch negative lead of multimeter to frame ground. Voltage should be present.
a. If voltage is present, go to test 3.
b. Repair or replace lead 400 if voltage is not present (para. 4-52).
Test 3. Check heater control box for power output.
Step 1. Set multimeter to a range that will measure 24 volts.
Step 2. Disconnect harness connector from rear of control box.
Step 3. Set heater control switch to START position and hold.
Step 4. Set heater control heat switch to HIGH.
Step 5. Touch positive lead of multimeter to pin A.
Step 6. Touch negative lead of multimeter to frame ground.
Step 7. Repeat steps 5 and 6 for pins B, C, and D. Voltage should be present.
a. If voltage is present at all pins tested, go to test 4.
b. Replace heater control box if voltage is not present at one or more pins (para. 14-5).
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