TM 9-2320-364-20-2 2-1192 6.  WORK LIGHT(S) WILL NOT OPERATE (CONT). 4. Replace work light internal switch (Para 7-55). 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 faulty. Work light internal ground wire   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 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 continuity is not measured, work light internal switch is faulty and work light will not operate. WARNING 5. Repair internal ground wire (see schematic Fig 2-27). 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   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 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 continuity is not measured, work light internal ground wire is faulty. WARNING Is continuity measured from terminal A of faulty work light connector to end of switch power wire? Is continuity measured from terminal B of faulty work light connector to lamp end of internal ground wire? Read   WARNING on Page 2-1193 Read   WARNING on Page 2-1193