TM 10-3930-669-20 8.  REAR LIGHT(S) DOES NOT OPERATE (CONT). KNOWN INFO 24 vdc circuits operate. Light lamp OK. Light lead OK. Wire 24 OK. Fuse 8 OK. POSSIBLE PROBLEMS Wire 24A faulty. Rear light switch faulty. TEST OPTIONS Voltage test. STE/ICE-R #89. REASON FOR QUESTION If   22   to   24   vdc   are   not present,  wire  24A  is  faulty. If    wire    24A    is    OK,    rear lights switch is faulty. 2-172

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