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 00-18 LIGHTING AND WIPER SYSTEM TROUBLESHOOTING (Contd) MALFUNCTION TEST OR INSPECTION CORRECTIVE ACTION 2. ALL STOPLIGHTS ARE INOPERATIVE Test 1. Check stoplight switch for input voltage. 1. Turn main light switch to SERVICE DRIVE position. 2. Set multimeter to voltage range that will measure 24 VDC. 3. Disconnect lead 75 input voltage from stoplight switch. 4. Touch positive lead of multimeter to contact end of lead 75. 5. Touch negative lead of multimeter to frame ground. Test 2. Check stoplight switch for output voltage. 1. Set multimeter to voltage range that will measure 24 VDC. 2. Disconnect output lead 75 from stoplight switch. 3. Touch positive lead of multimeter to contact end of stoplight switch. 4. Touch negative lead of multimeter to frame ground. 5. Depress brake pedal. 6. Place main light switch in OFF position. 7. Set multimeter to RX 1 scale. 8. Place positive lead of multimeter in pin A of wiring harness. 9. Place negative lead on input lead 75 at stoplight switch. NOTE If vehicle is equipped with hydraulic stoplight switch and switch is defective, replace air-activated stoplight switch conversion kit, part number 12255668. 1. If voltage is present, go to test 2. 2. If voltage is not present, go to WP 0013 00, table 1, malfunction 1, test 3. Depress brake pedal and check lead 75. If voltage is not present, and stoplights are still inoperative, go to step 6. 1. If continuity is present, replace stoplight switch (WP 0112 00). 2. If continuity is not present, repair or replace wire or wiring harness. Table 3. Directional Signal Systems Troubleshooting Procedures (Contd).