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ALTERNATOR Dual Circuit - Rectifier Plug Type TESTING FOR SHORT IN ALTERNATOR SYSTEM Disconnect   charging   lead   from   battery,   and   connect charge   lead   test   lamp   in   series   between   battery   and charge  lead.    (Figure  169)  DO  NOT  START  ENGINE. Test lamp should not light.  If it does light, stator charging lead is shorted or diode is defective.  Disconnect charge lead connector at alternator.  If test light does not go out, the  lead  from  the  cap  to  the  battery  is  shorted.    If  light goes out, diode is defective. Fig.  169 - Testing for Short in Stator, Diode or Charge Lead TESTING DIODE Disconnect  connector  plug.    Set  meter  on  ohm  scale. Check  diode  by  attaching  one  meter  lead  to  red  stator lead  wire.    (A  needle  may  be  used  to  pierce  stator  lead wire insulation.) Touch the other meter lead to diode join in   plastic   connector,   then   reverse   meter   leads.      The meter  should  show  a  reading  in  one  direction  only.    If meter  shows  a  reading  in  both  directions  or  does  not show a reading in either direction, the diode is defective and the connector assembly must be replaced.  See Fig. 170. Fig.  170 - Testing Diode NOTE:  Service  replacement  diodes  are  pre-assembled to   a   connector   and   a    short    lead    wire    for    ease    of installation. TESTING STATOR CHARGING COILS Remove blower housing, flywheel etc.  and examine red lead  wire  for  cuts,  damaged  insulation  or  obvious  short on  lead.    If  bare  spots  are  found  repair  with  electrical tape.  If short cannot be repaired, replace stator.  Stator should also be checked for continuity as follows: Use  VOA  meter  set  on  ohm  scale.    Touch  one  meter lead to stator laminations, touch the other meter lead to red  stator  charge  lead  wire.    (Pierce  red  wire  insulation with a needle to insure meter lead contact.) Meter should show continuity.  Fig.  171. Next  remove  screw  which  attaches  stator  ground  wires to  stator  laminations.    Be  certain  ground  wire  does  not touch   laminations   as   shown   in   Fig.      171   and   repeat previous test.  Meter should not show continuity.  If meter does not show continuity in first test or shows continuity during   second   test,   stator   is   defective   and   must   be replaced. Fig.  171 - Testing Stator NOTE: Discoloration of stator coils does not mean stator is  defective.    A  shorted  diode  will  pass  battery  current thru  stator  coils  to  ground,  which  discolors  coils  due  to heat.  Replacing diode would normally restore alternator without replacing stator. 53


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