TM-9-2320-361-24-1 Field Maintenance Manual Volume 1 for M44A2 Series Trucks
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TM 9-2320-361-24-1 0015 00 0015 00-14 HEATING SYSTEMS TROUBLESHOOTING (Contd) Table 1. Heating Systems Troubleshooting Procedures (Contd). MALFUNCTION TEST OR INSPECTION CORRECTIVE ACTION 4. HEATER CONTROL BOX LIGHT INOPERATIVE, BUT HEATER OPERATIVE Test 1. Check for voltage at heater control box indicator lamp. 1. Set multimeter to a voltage range that will measure 24 VDC. 2. Position heater control switch to RUN. 3. Position heater switch to HIGH. 4. Remove heater control box indicator lamp. 5. Touch positive lead of multimeter to indicator lamp socket. 6. Touch negative lead of multimeter to frame ground. Test 2. Check for voltage between personnel heater and heater control box. 1. Disconnect wiring harness behind personnel heater control box. 2. Connect jumper wire from pin D to pin E at personnel heater. 1. If voltage is present, replace indicator lamp. 2. If voltage is not present, go to test 2. 1. If heater control box indicator lamp is lit, replace personnel heater (WP 0351 00). 2. If indicator lamp fails to light, repair or replace wiring harness (WP 0090 00). END OF WORK PACKAGE INDICATOR LAMP HEATER CONTROL BOX PERSONNEL HEATER TEST 1 STEPS 5 AND 6 HARNESS CONNECTOR