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TROUBLE SHOOTING - TM-5-4210-230-14P-1_440
TRUCK SERVICE MANUAL TM 5-4210-230-14&P-1 ELECTRICAL DESCRIPTION The  IH  heavy  duty  alternators  (View  A)  are  14  volt  self load limiting alternators which feature a fully adjustable, built-in solid state voltage regulator. The   alternators   incorporate   a   22.2   mm   (7/8")   straight shaft, a large ball bearing at the drive end and a roller bearing at   the   slip   ring   end.   The   alternators   have   a   two   leg   swivel mounting,   one   leg   of   which   is   equipped   with   a   slideable bushing.  The rotor shaft may be rotated in either direction. Six    silicone    diodes    mounted    in    heat    sinks    convert alternating   current   from   the   delta   wound   stator   into   direct current.  A capacitor connected between the heat sinks assists in  suppressing  transient  voltage  spikes  which  could  possibly injure the diodes. The   brushes   and   voltage   regulator   are   located   in   a waterproof  housing  and  may  be  removed  for  replacement  or inspection without dismantling the entire machine.  An external relay   terminal   is   also   provided   for   operation   of   chargelight relays   or   other   accessories   which   might   require   power   from such a source. The   alternators   have   ungrounded   output   terminals   so that  they  may  be  used  on  either  positive  or  negative  ground systems.  Aside from connecting the proper vehicle wires to the correct   output   terminals,   no   other   wiring   is   required   on   the alternator, eliminating field relays or ignition switch connections. OPERATION Current  is  produced  by  rotating  a  magnet  called  a  rotor inside a stationary winding called a stator. The  rotor  is  electrically  magnetized  by  a  small  current flowing through it via brushes riding on smooth slip rings. Alternating  current  is  produced  as  the  magnet  poles  of the   rotor   pass   through   the   coil   windings   of   the   stator.      For increased    capacity,    there    are    twelve    (12)    magnetic    poles incorporated  into  the  rotor  and  three  (3)  separate  windings  in the  stator.    Since  alternating  current  is  produced  as  the  rotor passes  the  coil  windings  of  the  stator,  increased  engine  speed produces more current. The  battery  stores  only  direct  current  and  cannot  use alternating  current.    For  this  reason,  rectifier  assemblies  are used  to  convert  alternating  current  produced  in  the  stator  to direct current.  Rectifiers consist of silicon diodes which function as   electrical   switches   and   permit   current   flow   in   only   one direction. The  rectifier  diodes  are  mounted  in  aluminum  castings, called heat sinks, which are finned to dissipate heat. A built-in solid state voltage regulator controls alternator output  and  the  battery's  state  of  charge.    The  diode  trio,  so called because it consists of three (3) diodes, converts a small amount  of  alternator  current  from  the  stator  into  direct  current which is used as a signal to turn on the regulator. The   regulator   senses   when   the   battery   has   received sufficient   charge   and   then   reduces   the   "field"   (magnetizing) current flow to the rotor. Reducing the field current flow, in turn, reduces alternator output. When headlights and/or accessories place a load on the battery,   the   regulator   increases   the   field   current   flow   to   the rotor, thereby increasing alternator output. PREVENTIVE MAINTENANCE Mounting   hardware   including   brackets   and   drive   belts must   be   periodically   inspected   and   adjustments   or   repairs performed  as  required.  It  is  important  that  mounting  bolts  and nuts be kept securely tightened to maintain belt alignment and prevent   vibration   damage   which   will   occur   if   mounting   bolts work loose. Vehicle wiring must be inspected at periodic intervals for loose or corroded connections and repairs made as needed. CTS-2743T  Page 3 PRINTED IN UNITED STATES OF AMERICA

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