TM 10-3930-669-20 8.  REAR LIGHT(S) DOES NOT OPERATE (CONT). KNOWN INFO 24 vdc circuits operate. Fuse 8 OK. Wire 24A OK. Rear light switch OK. POSSIBLE PROBLEMS Light lamp faulty. Light lead faulty. Wire 24 faulty. KNOWN INFO 24 vdc circuits operate. Fuse 8 OK. Wire 24A OK. Rear light switch OK. Light lamp OK. POSSIBLE PROBLEMS Light lead faulty. Wire 24 faulty. TEST OPTIONS Continuity test, STE/ICE-R #91. REASON FOR QUESTION If  continuity  is  not  present, lamp is faulty. TEST OPTIONS Continuity test. STE/ICE-R #91. REASON FOR QUESTION If   continuity   is   not   present, light  lead  is  faulty.    If  light lead is OK, wire 24 is faulty. 2-170