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REPAIR (cont) - TM-5-4210-220-12_543
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REPAIR (cont) - TM-5-4210-220-12_545
TM 5-4210-220-12 4-24.  ELECTRICAL SYSTEM - Continued 4-24.2 Starting Motor - Continued Short circuits are located by use of a growler.  When the armature is revolved in the growler, a metal strip, such as a hacksaw blade, held above it will vibrate above the area of the armature core in which the short circuit is located.  Shorts between commutator bars are sometimes produced by brush dust or copper between the bars.  These shorts can be eliminated by cleaning out the slots.  Replace armature if short cannot be removed. Ground circuits are located by placing one test point of a 110-volt test lamp on the commutator bar with the other point on the core or shaft.  Replace the armature if a winding is grounded. (24) Check electrical continuity of the field coils.  Connect a 110- volt test lamp between the field coil connector and the field frame.  If the lamp illuminates, at least one field coil is grounded. (25) Remove all coils and separately test each coil.  Replace any falling inspection. (26) Connect  test  lamp  leads  to  each  field  coil  and  check  for  an  open  circuit  field  coil.    If  lamp  does  not illuminate field coins are open circuit. (27) Connect  the  solenoid  circuit  as  shown.    If  the  current  reading  is  very  high  this  indicates  a  shorted  or grounded  hold-in  winding.    A  very  low  reading  indicates  poor  connections.    Replace  the  solenoid  if  any faults are indicated. CAUTION To prevent overheating of the winding, connect pull-in winding for 15 seconds only. 4-420

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