TM  10-3930-638-24&P 3-12.   ALTERNATOR   REPAIR   (cont) STEP LOCATION- ITEM ACTION REMARKS TESTING  (cont) 14 15 Stator (4) Test Rotor (23) Test Use an ohmmeter to check. Connect test prods as shown. If meter reading is low when connected to any stator lead and frame, the windings are grounded. If the meter reading is high when connected between each pair of  stator  leads,  the  windings  are  open. If stator winding is grounded or open or if evidence of short is observed, re- place stator Use 110 volt test lamp. Connect test lamp from rotor slip ring to rotor shaft. If lamp lights,  the  field  windings  are  grounded. Connect test lamp leads to each rotor slip ring. If lamp fails to light, field windings are open. Connect ammeter and battery to rotor as shown. If ammeter indicates more than 4.0 to 4.5 amperes, rotor field windings  are  shorted.  If  field  windings  are grounded, open or have shorted, replace rotor REASSEMBLY 16 Drive  end a. Grease slinger Install frame (1) washer (30) b. Inside of bearing Back up Use  camshaft  gear  remover  tool area on end frame (1) c. Ball bearing (29) Install Press on closed end of bearing until flush with  end  frame  housing d. Ball bearing re- install Use valve guide installer tool until retainer tainer  plate  (28) seats against bearing (29) e. Three screws (27) Install  and Until  retainer  (28)  is  securely  mounted tighten 3-99