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 00-2 HEATING SYSTEMS TROUBLESHOOTING (Contd) MALFUNCTION TEST OR INSPECTION CORRECTIVE ACTION 1. ENGINE MANIFOLD HEATER DOES NOT WORK (Contd) Test 2. Test input voltage to manifold heater switch. 1. Disconnect lead 55 at switch input. 2. Turn power accessory switch to ON position. 3. Connect negative lead of multimeter to frame ground. 4. Touch positive lead of multimeter to contact end of lead 55. Test 3. Test continuity of manifold heater switch. 1. Turn power accessory switch to OFF position. 2. Disconnect lead 55 to manifold heater switch output. 3. Set multimeter to RX 1 scale. 4. Connect negative lead to one side of switch and touch positive lead to other side. Push manifold heater switch. 1. If battery voltage is present, go to test 3. 2. If battery voltage is not present, go to WP 0018 00, table 2, NG81. 1. If continuity is not present, replace manifold heater switch (WP 0105 00). 2. If continuity is present, reconnect lead 55 to manifold heater switch output and go to test 4. Table 1. Heating Systems Troubleshooting Procedures (Contd). TEST 3 STEP 4 TEST 3 STEP 4 MANIFOLD HEATER SWITCH LEAD 55