TM 10-3930-669-20 VISUAL INSPECTION (1)   Set   MAIN   POWER   switch   to   ON position (TM 10-3930-669-10). (2) Set engine switch to ignition position (TM 10-3930-669-10). (3)  Set  rear  light  switch  to  ON  position (TM 10-3930-669-10). (4) Observe rear light. (a)    If    rear    light    fails    to    operate, perform   Steps   (5)   through   (7) below  and  go  to  Step  4  of  this Fault. (b)   If   rear   light   operates,   perform Steps (5) through (7) below and go to Step 2 of this Fault. (5) Set rear light switch to OFF position. (6) Set engine switch to off position. (7)   Set   MAIN   POWER   switch   to   OFF position. 2-169