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 0013 00 0013 00-3 LIGHTING AND WIPER SYSTEM TROUBLESHOOTING (Contd) MALFUNCTION TEST OR INSPECTION CORRECTIVE ACTION 1. HEADLIGHT DOES NOT OPERATE ON LOW OR HIGH BEAM, OR BOTH HEADLIGHTS INOPERATIVE (Contd) Test 2. Test dimmer switch. 1. Ensure body ground straps are secure and clean. 2. Check dimmer switch input voltage. Remove lead 16 from dimmer switch. 3. Check lead 16 contact end for battery voltage. Check dimmer switch continuity. 1. Remove corrosion and dirt buildup from ground lead connection. 2. Tighten screws connecting ground strap to frame. 1. If voltage is present, go to step 3. 2. If voltage is not present, go to test 3. 1. Remove lead 17 from dimmer switch to pin L. Remove lead 18 from dimmer switch to pin L. 2. Set multimeter to RX 1 scale. Check continuity between input pin and pin L. 3. If continuity is not found, push dimmer switch to change from HIGH to LOW. Recheck continuity. 4. If no continuity is present, replace dimmer switch (WP 0111 00). 5. If continuity is present, check continuity between pin H and input pin. 6. If continuity is present, push dimmer switch to ON position to change from LOW to HIGH. 7. If continuity is not present, replace dimmer switch (WP 0111 00). 18 16 17 MAL 1 TEST 2 STEP 2 MAL 1 TEST 2 STEP 2 MAL 1 TEST 2 STEP 1 INPUT PIN PIN H Table 1. Lighting System Troubleshooting Procedures (Contd). DIMMER SWITCH PIN L