TM 10-3930-664-10 KEY CONTROL OR INDICATOR FUNCTION 2 Auxiliary Lighting Switch This  light  switch  has  four  positions.    The  following  lists  the  lights  that  will operate in each position: OFF Position: Instrument panel lamps and tail lights off. PARK  Position:  Service  tail  lights  lit  (if  main  switch  section  in  SER  DRIVE position).  Blackout tail lights lit (if main switch section in BO MARKER or BO DRIVE position). PANEL BRT Position: All gauge lamps are on with maximum illumination. PANEL DIM Position: All gauge lamps are on with minimum illumination. 3 Switch Lock This lock is used to prevent accidental movement of the main lighting control switch.  Lift lock lever to move main lighting control switch to STOP LIGHT, SER DRIVE, or BO DRIVE positions. 4 Front Floodlight Switch In the ON position, front floodlights illuminate. 5 Rear Floodlight Switch In the ON position, rear floodlights illuminate. 2-6