TM 10-3930-669-34 1-15.  ELECTRICAL SYSTEM (CONT). d. Engine Starting and Stopping.  The engine starting system consists of a starter motor (1), solenoid (2), neutral start relay (3), and  engine  switch  (4).    Battery  voltage  is  used  to  operate  the  starter  motor  (1).    The  starter  motor  (1)  is mounted on the engine and engages the flywheel only when electrically energized.  When the engine switch (4) is turned to  the  off  position,  the  fuel  shutoff  solenoid  (2)  is  de-energized  causing  the  injection  pump  to  stop  fuel  supply  to  the injectors. 1-14