TM 9-2320-364-20-2 2-1236 10.  HEADLIGHT(S) DO NOT OPERATE (LOW BEAM) (CONT). 6. Repair wire 1927 (see schematic Fig 2-31) or notify DS Maintenance. Verify repair, go to Step 14 of this Fault. YES NO Circuit breakers CB1 and CB4   not tripped. Work lights operate indicating   10 to 14 vdc to circuit breaker   CB1. Headlight lamp OK. Headlight wire 1006 OK. Headlight wire 1435 OK. Circuit breaker CB1 OK. Wire 1927 faulty. Wire 1049 faulty. Headlights relay R1 wire 1435   faulty. Headlights relay R1 faulty. Wire 1017 faulty. Dimmer relay R5 faulty. Wire 1006 faulty. Wire 1292 faulty. Headlight switch faulty. Wire 1049 faulty. KNOWN INFO POSSIBLE PROBLEMS TEST OPTIONS REASON FOR QUESTION Voltage test. STE/ICE-R #89. If wire 1927 is loose, faulty, or shorted to ground, headlights will not operate. WARNING 7. Go to Step 12 of this Fault. YES NO Circuit breakers CB1 and CB4   not tripped. Work lights operate indicating   10 to 14 vdc to circuit breaker   CB1. Headlight lamp OK. Headlight wire 1006 OK. Headlight wire 1435 OK. Circuit breaker CB1 OK. Wire 1927 OK. Wire 1049 faulty. Headlights relay R1 wire 1435   faulty. Headlights relay R1 faulty. Wire 1017 faulty. Dimmer relay R5 faulty. Wire 1006 faulty. Wire 1292 faulty. Headlight switch faulty. Wire 1049 faulty. KNOWN INFO POSSIBLE PROBLEMS TEST OPTIONS REASON FOR QUESTION Voltage test. STE/ICE-R #89. If wire 1049 is loose, faulty, or shorted to ground, headlights will not operate. WARNING Are 10 to 14 vdc measured on wire 1927 at headlights relay R1, terminal 30? Are 10 to 14 vdc measured on wire 1049 at headlights relay R1, terminal 85? Read   WARNING on Page 2-1237 Read   WARNING on Page 2-1237