TM 9-2320-364-20-2 2-1230 10.  HEADLIGHT(S) DO NOT OPERATE (LOW BEAM) (CONT). 2. Replace headlight lamp (Para 7-45). 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 faulty. Headlight wire 1006 faulty. Headlight wire 1435 faulty. Circuit breaker CB1 faulty. 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 Continuity test. STE/ICE-R #91. If headlight lamp or wires are damaged, headlight will not operate. WARNING 3. Repair wire 1006 (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 faulty. Headlight wire 1435 faulty. Circuit breaker CB1 faulty. 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 headlight wire 1006 is loose, faulty, or shorted to ground, headlight will not operate. WARNING Is continuity measured across headlight lamp between connectors on wires 18 and 91? Are there 10 to 14 vdc measured at faulty headlight wire 1006? Read   WARNING on Page 2-1231 Read   WARNING on Page 2-1231