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 0006 00 0006 00-27 MECHANICAL SYSTEMS TROUBLESHOOTING - UNIT (Contd) Table 21. Personnel Fuel Burning Heater Troubleshooting Procedures (Contd). MALFUNCTION TEST OR INSPECTION CORRECTIVE ACTION 1. HEATER WILL NOT OPERATE IN HIGH OR LOW POSITION (Contd) Test 4. Check for input power at fuel pump. 1. Set multimeter to range that will measure 24 VDC. 2. Disconnect lead 25 at fuel pump. 3. Touch multimeter positive lead to contact end of lead 25. 4. Touch multimeter negative lead to frame ground. Voltage should be present. Test 5. Check fuel pump for proper operation. Test 6. Check for power input at personnel heater. 1. Set multimeter to voltage that will measure 24 VDC. 2. Disconnect harness connector at personnel heater. 3. Set heater control switch. 4. Touch multimeter positive lead to pin A of harness connector. 5. Touch multimeter negative lead to frame ground. 6. Repeat steps 4 and 5 for pins B, C, and D. Voltage should be present at all pins tested. 1. If voltage is present, replace personnel fuel burning heater (WP 0351 00). 2. If voltage is not present, repair or replace lead 25 (WP 0090 00). Refer to WP 0006 00, table 21, malfunction 2. 1. If voltage is present, replace personnel heater (WP 0351 00). 2. If voltage is not present at one or more pins, repair or replace