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 00-8 HEATING SYSTEMS TROUBLESHOOTING (Contd) Table 1. Heating Systems Troubleshooting Procedures (Contd). MALFUNCTION TEST OR INSPECTION CORRECTIVE ACTION 2. HOT WATER PERSONNEL HEATER DOES NOT OPERATE OR DOES NOT OPERATE IN LOW POSITION (Contd) Test 4. Test personnel heater for power input. 1 Ensure heater switch is in high position. 2. Set multimeter to a range that will measure 24 VDC. 3. Disconnect lead 400 from personnel heater. 4. Touch multimeter positive lead to contact end of lead 400. 5. Touch multimeter negative lead to frame ground. Voltage should be present. Test 5. Test blower motor resistor. 1. Set multimeter to RX 1. 2. Ensure heater switch is set to low position. 3. Touch positive lead of multimeter to one lead on resistor. 4. Touch negative lead of multimeter to the other end of resistor. 1. If voltage is not present, repair or replace lead 400 (WP 0090 00). 2. If voltage is present, and personnel heater fails to operate, replace personnel heater (WP 0250 00). If resistance is not within tolerance of 4.5 ohms and 5.5 ohms, replace resistor (WP 0117 00). TEST 4 STEPS 4 AND 5 LEAD 400