T M    9 - 2 3 5 0 - 2 5 6 - 2 0 CHAPTER   2:   VEHlCLE   MAINTENANCE   lNSTRUCTlONS 2 - 1 6    Q U I C K    G U I D E    T O    T R O U B L E S H O O T I N G - C o n t i n u e d c.  ELECTRICAL-Continued Item APU  Engine  Oil Pressure  Gage Circuit Mechanical Transmission  Oil Pressure Light Master   Warning Light Powerplant Warning  Horn External   Vehicle Warning   Horn Bilge Pump System   and Electrical Accessories   Panel Power  Outlet Personnel  Heater Control  System Communication System Dome  Lights Passive   Night Viewer Problem 1 2 1 2 3 4 1 2 3 1 2 3 1 2 3 1 2 3 APU ENGINE OIL PRESSURE gage fails to operate. See page 2-190 Mechanical transmission oil pressure warning light does not go out with   mechanical   transmission   operating. Mechanical  transmission  oil  pressure  warning  light  fails  to operate  with  mechanical  transmission  stopped. See page 2-197 See page 2-197 MASTER  WARNING  light  fails  to  operate  with  engine  off. MASTER  WARNING  light  does  not  go  out  after  starting  engine. MASTER   WARNING   light   does   not   light   with   high   transmission oil  temp,  but  lights  with  engine  off. MASTER  WARNING  light  does  not  light  with  high  engine  oil temp,  but  lights  with  engine  off. See page 2-204 See page 2-204 See page 2-204 See  page  2-204 Powerplant  warning  horn  fails  to  operate. See page 2-213 External  External  warning  horn  fails  to  operate. See  page  2-219 Bilge  pump  fails  to  operate. Bilge  pump  indicator  lamp  fails  to  light  and  bilge  pump  operates. Electrical accessories panel power outlet has no power, and bilge pump    operates. Personnel  heater  fails  to  operate. See page 2-232 One  radio  fails  to  operate. See  page  2-238 Both  left  front  and  left  rear  dome  lights  fail  to  operate. Both  center  and  right  front  dome  lights  fail  to  operate. Only  one  dome  light  fails  to  operate. Passive  night  viewer  lamp  fails  to  light  but  passive  night  viewer operates. Passive  night  viewer  fails  to  operate. Both  lamp  and  passive  night  viewer  fail  to  operate. B.O.  receiver  lamp  fails  to  light  but  driver’s  periscope  operates. Driver’s  periscope  fails  to  operate. Both  lamp  and  driver’s  periscope  fail  to  operate. 2 - 3 8 Change  1 Solution  or Reference See  page  2-224 See  page  2-224 See  page  2-224 See page 2-240 See  page  2-240 See page 2-240 See  page  2-246 See  page  2-246 See  page  2-246 See  page  2-249 See  page  2-249 See  page  2-249 D r i v e r ' s Periscope