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Page Title: 2. HEADLIGHTS, CLEARANCE LIGHTS, HORN, WORK LIGHTS, DIMMER, OR BEACON LIGHT DO NOT OPERATE
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TM 9-2320-364-20-2 2-1140 2.  HEADLIGHTS, CLEARANCE LIGHTS, HORN, WORK LIGHTS, DIMMER, OR BEACON LIGHT DO NOT OPERATE. INITIAL SETUP 1. Repair wire 1189 (see schematic Fig 2-24) or notify DS Maintenance. Verify repair, go to Step 14 of this Fault. START YES NO 22 to 28 vdc register on 24 vdc   voltmeter indicating ENGINE   switch is OK. 10 to 14 vdc register on 12 vdc   voltmeter indicating batteries   are OK. Domelight operates indicating   10 to 14 vdc present on wire   1084 at BLACKOUT LIGHTS   switch. Wire 1189 between splice at   BLACKOUT LIGHTS switch   and 24V relay R12 faulty. Wire 1872 between ENGINE   switch and IGNITION circuit   breaker CB10 faulty. IGNITION circuit breaker CB10   faulty. Wire 1872 between IGNITION   circuit breaker CB10 and 24V   relay R12 faulty. Wire 1435 between 24V relay   R12 and known good   ground faulty. 24V relay R12 faulty. Wire 1430 faulty. Wire 1189 between 24V relay   R12 and magnetic switch   R28 faulty. Wire 1435 between magnetic   switch R28 and known good   ground faulty. Wire 1435 between magnetic   switch R28 and rectifier M52   faulty. Rectifier M52 faulty. Magnetic switch R28 faulty. Wire 1175 faulty. KNOWN INFO POSSIBLE PROBLEMS TEST OPTIONS REASON FOR QUESTION Voltage test. STE/ICE-R #89. If 10 to 14 vdc are not measured, wire 1189 is faulty. 2-20.  ELECTRICAL SYSTEM TROUBLESHOOTING (CONT). Tools and Special Tools Tool Kit, General Mechanic’s:  Automotive (Item 74, Appendix G) STE/ICE-R (optional) (Item 3, Appendix G) Multimeter (Item 44, Appendix G) References TM 9-2320-364-10 TM 9-4910-571-12&P Equipment Condition Engine OFF, (TM 9-2320-364-10) Parking brake applied, (TM 9-2320-364-10) Wheels chocked, (TM 9-2320-364-10) Are 10 to 14 vdc measured on wire 1189 at 24V relay R12? WARNING Read   WARNING on Page 2-1141

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