ARMY   TM   9-6115-643-24 AIR  FORCE  TO  35C2-3-445-22 TABLE 2-9. Diagnostic Connector Connection Points NOTE The  Diagnostic  Connector  can  be  used  as  a  troubleshooting  tool.  Refer to  FIGURE  2-17  for  pin  positions. PIN DESCRIPTION EXPECTED  OUTPUT* B Chassis  ground  (GND) Continuity 0 volts C DC  paralleling  voltage  for  governor  synchronization 0-20  VDC  (*,5) D Chassis  ground  (GND) Continuity 0 volts E Paralleling  voltage  for  voltage  regulator 0-20 VAC set freq. (*,5) F DC  exciter  field  voltage  (positive) 0-60  VDC  (*,6) G DC  paralleling  voltage  for  governor  synchronization 0-20  VDC  (*,5) H Paralleling voltage for voltage regulator 0-20 VAC set freq. J DC  exciter  field  voltage  (negative) 0-60  VDC  (*,7) M DC  voltage  input  to  governor 24 VDC(*) N DC  starter  motor  solenoid  coil 24 VDC (2 or 3) O DC  voltage  across  fuel  pump  (Aux) 24 VDC (1) P DC voltage S1, terminal 7 24  VDC  (2) S DC voltage across engine fuel solenoid coil 24 VDC (*) T DC voltage across starter crank relay coil 24 VDC (2 or 3) U DC  voltage  (output  of  DC  circuit  breaker) 24  VDC V DC  voltage  across  output  circuit  interrupter  coil 24 VDC (*) X DC starter motor (motor side of solenoid contacts) 24 VDC (2 or 3) Z DC voltage across fuel level contacts 24  VDC  (4) a b DC voltage across low oil pressure switch 0 volts (*) DC voltage across low oil pressure switch 24  VDC  (4) d DC battery charging voltage 24-27.6 VDC X Input frequency sensing voltage to governor 2-6 volts, 0-4000 Hz (3,8) Y Input frequency sensing voltage to governor 2-6 volts, 0-4000 Hz (3,8) * (1) With generator set operating Auxiliary fuel pump in operation (note fuel level), MASTER  SWITCH  in  PRIME  &  RUN  AUX  FUEL  position (2) During  engine  starting (3) Use DEAD CRANK switch (4) MASTER  SWITCH  in  PRIME  &  RUN  position (5) AC Cirsuit Interrupter dosed (6) Read between pins F and J (7) Read between pins J and F (8) Read between pins X and Y Change 2 2-97