TM 9-2320-364-20-2 2-1194 6.  WORK LIGHT(S) WILL NOT OPERATE (CONT). 6. Repair wire 1435 (see schematic Fig 2-27) or notify DS Maintenance. Verify repair, go to Step 14 of this Fault. YES NO Headlights operate, indicating   12 vdc input to circuit breaker   CB4. Work light lamp OK. Work light internal power wire   OK. Work light internal switch OK. Work light internal ground wire   OK. Wire 1435 at work light harness   connector faulty. Circuit breaker CB4 faulty. Wire 1040 faulty. Wire 1040A faulty. Wire 1435 between relay R4   and ground faulty. Relay R4 faulty. Wire 1292 faulty. Work light switch faulty. KNOWN INFO POSSIBLE PROBLEMS TEST OPTIONS REASON FOR QUESTION Continuity test. STE/ICE-R #91. If work light ground wire 1435 is faulty, lamp will not operate. WARNING 7. Replace circuit breaker CB4 (Para 7-16). Verify repair, go to Step 14 of this Fault. YES NO Wire 1435 at work light harness   connector faulty. Circuit breaker CB4 faulty. Wire 1040 faulty. Wire 1040A faulty. Wire 1435 between relay R4   and ground faulty. Relay R4 faulty. Wire 1292 faulty. Work light switch faulty. Wire 1435 at work light harness   connector faulty. Circuit breaker CB4 faulty. Wire 1040 faulty. Wire 1040A faulty. Wire 1435 between relay R4 and   known good ground faulty. Relay R4 faulty. Wire 1292 faulty. Work light switch faulty. KNOWN INFO POSSIBLE PROBLEMS TEST OPTIONS REASON FOR QUESTION Voltage test. STE/ICE-R #89. If 10 to 14 vdc are not present, circuit breaker CB4 is faulty. WARNING Is continuity measured on wire 1435 between work light harness connector terminal B and a known good ground? Are 10 to 14 vdc measured on wire 1292 at circuit breaker CB4 with ENGINE switch ON? Read   WARNING on Page 2-1195 Read   WARNING on Page 2-1195