TM10-3930-660-10 Key 2 Control   or   Indicator Auxiliary   Lighting   Switch Function STOP   LIGHT   Position   -   Service   stop   lamps   will operate. SERVICE   DRIVE   Position   -   Service   stop   lamps   will operate.  Service  tail  lamps  will  operate.  Service headlamps   will   operate. This   switch   has   four   positions.   The   following   lists   the lights  that  will  operate  in  each  position: OFF  Position  -  Instrument  panel  light  and  parking  light circuits  are  open  and  will  not  operate. PARK  Position  -  Parking  lights  will  illuminate  if  service light   switch   is   in   SERVICE   DRIVE   position. PANEL  DIM  Position  -  Instrument  panel  lights  are  on with  minimum  illumination. PANEL   BRIGHT   Position   -   Instrument   panel   lights   are on   with   maximum   illumination. 2-6