TM 9-2320-364-20-2 2-1530 41.  TRAILER MARKER LIGHTS DO NOT OPERATE (CONT). 2. Repair wire 1676 (see schematic (Fig 2-35) or notify DS Maintenance. Verify repair, go to Step 6 of this Fault. YES NO Trailer brake lights operate   indicating that wire 1435 at   connector MC15 is OK. 22 to 28 vdc supplied to   connector MC15. Wire 1676 faulty. Wire 1017 faulty. Wire 1435 faulty. Relay R14 faulty. Wire 1008C faulty. KNOWN INFO POSSIBLE PROBLEMS TEST OPTIONS REASON FOR QUESTION Voltage test. STE/ICE-R #89. If 22 to 28 vdc are not present, wire 1676 is faulty. WARNING 3. Repair wire 1017 (see schematic Fig 2-35) or notify DS Maintenance. Verify repair, go to Step 6 of this Fault. YES NO Trailer brake lights operate   indicating that wire 1435 at   connector MC15 is OK. 22 to 28 vdc supplied to   connector MC 15. Wire 1676 OK. Wire 1017 faulty. Wire 1435 faulty. Relay R14 faulty. Wire 1008C faulty. KNOWN INFO POSSIBLE PROBLEMS TEST OPTIONS REASON FOR QUESTION Voltage test. STE/ICE-R #89. If 10 to 14 vdc are not present, wire 1017 is faulty. WARNING Are 22 to 28 vdc measured on wire 1676 at trailer service lights relay R14, terninal 30? Are 10 to 14 vdc measured on wire 1017 at trailer service lights relay R14, terminal 86? Read   WARNING on Page 2-1531 Read   WARNING on Page 2-1531