TM 9-2320-260-20
Table 2-4. Electrical Troubleshooting (Contd).
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
39. HEATER CONTROL BOX LIGHT INOPERATIVE, BUT HEATER OPERATIVE
Test 1. Check for voltage at heater control box indicator lamp.
Step 1. Set multimeter to a voltage range that will measure 24 volts.
Step 2. Position heater control switch to RUN position.
Step 3. Position heater switch to HIGH position.
Step 4. Remove heater control box indicator lamp.
Step 5. Touch positive lead of multimeter to indicator lamp socket.
Step 6. Touch negative lead of multimeter to frame ground. Voltage should be present.
a. If voltage is present, replace indicator lamp.
b. If voltage is not present, go to test 2.
Test 2. Check for voltage between personnel heater and heater control box.
Step 1. Disconnect wiring harness at personnel heater.
Step 2. Connect jumper wire from pin D to pin E at harness connector.
a. Redate personnel heater if heater control box indicator lamp is lit (para 14-2).
b. Repair or replace wiring harness if indicator lamp fails to light (para. 4-52 or 14-12).
END OF TESTING!
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