TM 10-3930-653-14&P 4-7-5.  ALTERNATOR 4-7-5-1.  DESCRIPTION In the alternator, a magnetic field is produced by the rotor  which  consists  of  alternator  shaft,  field  coil,  pole pieces. and slip rings. The slip rings pressed on the shaft conducts   only   a   small   field   current.   Output   current   is generated in the armature coils located in the stator. The stator   has   three   windings   and   generates   three-phase alternating current. Silicon diodes act like a oneway valve for electricity so that charging current passes easily. but reverse  current  is  shut  out.  In  this  alternator,  six  diodes (three    negative    and    three    positive),    are    installed    in positive and negative plates as an assembly. Pack-type  silicon  diodes  are  used  in  this  alternator. These   diodes   are   soldered   directly   at   their   tips,   and constructed with positive and negative conjunction. They are   mounted   on   the   two   plates   which   combine   the function of heat-dissipating and positive/negative terminals. They are light in weight and easy to service. Fig. 4-173.  Alternator 4-103