TM10-3930-660-10 Key Control   or   Indicator Function 5 Parking   Brake   Indicator   Light Illuminated   when   the   STARTER-RUN   CONTROL switch  is  “on”  and  the  parking  brake  is  engaged. 6 Shut  the  vehicle  down  immediately  whenever  the  low  brake  pressure warning  light  is  illuminated.  Failure  to  do  so  can  result  in  injury  or  death. Low   Brake   Pressure   Warning Light Indicates   low   pressure   of   the   service   brakes. Illuminated   whenever   the   hydraulic   pressure in  the  accumulator  drops  below  650  psi. d. Lighting     Switches. Key Control   or   Indicator Function 1 I Service   Lighting   Control This   light   switch   has   five   positions.   The Switch following  lists  the  lights  that  will  operate  in  each position: OFF   Position   -   Only   forard,   rear   and   boom   floodlights will    operate. BLACKOUT   MARKER   Position   -   Blackout   front markers   will   operate.   Blackout   tail   lamps   will   operate. Blackout   stop   lamps   will   operate. BLACKOUT   DRIVE   Position   -   Blackout   front   markers will   operate.   Blackout   tail   lamps   will   operate.   Blackout stop   lamps   will   operate.   Blackout   drive   lamp   will operate.   Back-up   alarm   will   not   operate. 2-5