TM 9-2320-364-20-2 2-1196 6.  WORK LIGHT(S) WILL NOT OPERATE (CONT). 8. Repair wire 1040 (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 switch OK. Work light internal power wire   OK. Work light internal ground wire   OK. Wire 1435 at work light harness   connector OK. Circuit breaker CB4 OK. Wire 1040 faulty. Wire 1040A faulty. Wire 1435 between relay R4   and 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, power will not be supplied to work lights. WARNING 9. Repair wire 1040A (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 switch OK. Work light internal power wire   OK. Work light internal ground wire   OK. Wire 1435 at work light harness   connector OK. Circuit breaker CB4 OK. Wire 1040 OK. Wire 1040A faulty. Wire 1435 between relay R4   and 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, work light will not operate. WARNING Are 10 to 14 vdc measured on wire 1040 at work light relay R4, terminal 30 with ENGINE switch ON and work light on? Are 10 to 14 vdc measured on wire 1040A at work light relay R4, terminal 85? Read   WARNING on Page 2-1197 Read   WARNING on Page 2-1197