TM 9-2320-364-20-2 2-1222 9.  BEACON LIGHT DOES NOT OPERATE (CONT). 5. Repair wire 1413 (see schematic Fig 2-30) or notify DS Maintenance.   Verify repair, go to Step 9 of this Fault. YES NO Horn operates, indicating circuit   breaker CB3 OK. Dome light operates, indicating   10 to 14 vdc to wire 1276. Wire 1435 OK. Wire 1276 OK. Beacon light switch OK. Wire 1413 faulty. Wire 1184 faulty. Relay R6 not grounded. Beacon relay R6 faulty. Wire 1029 faulty. KNOWN INFO POSSIBLE PROBLEMS TEST OPTIONS REASON FOR QUESTION Voltage test. STE/ICE-R #89. If wire 1413 is loose, faulty, or shorted to ground, beacon light will not operate. 6. Repair wire 1184 (see schematic Fig 2-30). Verify repair, go to Step 9 of this Fault. YES NO Horn operates, indicating circuit   breaker CB3 OK. Dome light operates, indicating   10 to 14 vdc to wire 1276. Wire 1435 OK. Wire 1276 OK. Beacon light switch OK. Wire 1413 OK. Wire 1184 faulty. Relay R6 not grounded. Beacon relay R6 faulty. Wire 1029 faulty. KNOWN INFO POSSIBLE PROBLEMS TEST OPTIONS REASON FOR QUESTION Voltage test. STE/ICE-R #89. If wire 1184 is loose, faulty, or shorted to ground, beacon light will not operate. WARNING Are 10 to 14 vdc measured on wire 1413 at beacon relay R6, terminal 30? Are 10 to 14 vdc measured on wire 1184 at beacon relay R6, terminal 85? Read   WARNING on Page 2-1223