ARMY   TM   9-6115-642-24 AIR  FORCE  TO  35C2-3-455-12 MARINE   CORPS   TM   09247A/09248A-24/2 TABLE  2-10.  Diagnostic  Connector  Connection  Points NOTE The  Diagnostic  Connector  can  be  a  useful  troubleshooting  tool.  Refer  to  FIGURE  2-13 for pin positions. PIN DESCRIPTION B AC  chassis  ground  (GND) D DC   ground F DC exciter field voltage (positive) J DC  exciter  field  voltage  (negative) K DC  voltage  across  engine  fuel  solenoid  coil N DC  starter  motor  solenoid  coil 0 DC  voltage  across  auxiliary  fuel  pump P DC  voltage  S1  terminal  7 R DC  voltage  S1  terminal  3 T DC  voltage  across  starter  crank  relay  coil U DC  voltage  (output  to  DC  circuit  breaker) V DC  voltage  across  output  circuit  interrupter  coil X DC  starter  motor  (motor  side  of  solenoid  contacts) Z DC  voltage  across  fuel  level  contacts a DC  voltage  across  low  oil  pressure  switch b DC  voltage  across  low  oil  pressure  switch d DC  battery  charging  voltage  (input  to  DC  circuit  breaker) *  With  Generator  Set  Operating, EXPECTED   OUTPUT   * Continuity  0  Volts  (*) Continuity 0 Volts (*) 0-45  VDC  (4) 0-45  VDC  (5) 24 VDC (1) 24 VDC (2) or (6) 24 VDC (3) (7) 24 VDC (6) 24 VDC (1) (3) (6) 24 VDC (2) or (6) 24 VDC (*) 24 VDC (*) 24 VDC (2) or (6) 24 VDC (1) 0 VDC (1) 24 VDC (*) 24-27.6  VDC  (*) (1)  Place  MASTER  SWITCH  in  PRIME/RUN  position. (2)  Place  DEAD  CRANK  switch  in  CRANK  position. (3)  Place  MASTER  SWITCH  in  PRIME/RUN  AUX.  FUEL  position. (4)  Read  between  Pin  F  and  J. (5) Read between Pin J and F. (6)  During  Engine  Starting.. (7)  Auxiliary  Fuel  Pump  in  operation  (Note  Fuel  Level  Must  be  Low),  MASTER  SWITCH  in  PRIME/RUN  position 2-37  CONTROL  PANEL  LIGHTS. 2-37.1   Inspection. a. Shut  down  generator  set. b. Release  control  panel  by  turning  two  fasteners  and  lower  control  panel  slowly. C. Inspect  control  panel  lights  for  cracks,  stripped  threads,  corrosion,  and  other  damage. d. Raise  and  secure  control  panel. 2-37.2 Removal. a. Shut  down  generator  set. b. Open  left  side  engine  access  door  and  disconnect  negative  battery  cable. C. Release  control  panel  by  turning  two  fasteners  and  lower  control  panel  slowly. d. Tag  and  disconnect  panel  light  (3,  FIGURE  2-14)  electrical  leads. e. Remove  nut  (1)  and  washer  (2). f. Remove  panel  light  (3)  from  control  panel. 2-64  Change  2