TM 9-2320-364-20-2 2-1328 20.  REVERSE LIGHT DOES NOT OPERATE (CONT). Work lights operate indicating   10 to 14 vdc to circuit breaker   CB3. Circiut breakers CB3 and CB4   OK. Reverse light backup lamp OK. Wire 1149 OK. Wire 1435 faulty. KNOWN INFO POSSIBLE PROBLEMS TEST OPTIONS REASON FOR QUESTION Continuity test. STE/ICE-R #91. If reverse light is not grounded through wire 1435, reverse light will not operate. YES NO Repair wire 1435 (see schematic Fig 2-33) or notify DS Maintenance. Verify repair, go to Step 9 of this Fault. 3. Is continuity measured on wire 1435 between connector MC77, terminal B and a known good ground? Fault not corrected. Notify DS Maintenance. 2. Go to Step 4 of this Fault. YES NO Work lights operate indicating   10 to 14 vdc to circuit breaker   CB3. Circuit breakers CB3 and CB4   OK. Engine starts indicating 10 to 14   vdc to wire 1871. Reverse light backup lamp OK. Wire 1149 faulty. Wire 1435 faulty. Wire 1891 faulty. Wire 1871 faulty. Wire 214 faulty. ATEC ECU faulty. Reverse relay R10 faulty. KNOWN INFO POSSIBLE PROBLEMS TEST OPTIONS REASON FOR QUESTION Voltage test. STE/ICE-R #89. Isolate fault. WARNING WARNING Are 10 to 14 vdc measured on wire 1149 at reverse light? Read WARNING on Page 2-1329 Read WARNING on Page 2-1329