TM  10-3930-638-24&P 3-12.  ALTERNATOR  REPAIR  (cont) STEP LOCATION ITEM ACTION REMARKS TESTING CAUTION Do not use 110 volt test lamp to test diode trio. 12 Diode  trio  (8) Set  ohmmeter  to  lowest  resistance  range. Connect ohmmeter leads to single con- nector tab and one of three stator lead connectors as shown. Observe reading. Reverse ohmmeter leads and observe read- ing. Repeat procedure with each of two remaining stator lead connectors. Read- ings should not be identical in each test. There should be one low and one high reading for each test. If readings are either both high or low, replace the diode trio 13 Rectifier  bridge  as- Test Use ohmmeter. Connect prod to grounded sembly  (12) heat sink and the base of one of the three terminals as shown. Observe reading. Reverse prods. Observe reading. If read- ings  are  identical,  replace  bridge.  Repeat procedure  with  remaining  two  terminals. Connect prods to insulated heat sink and one  of  three  terminals.  Observe  reading. Reverse prods. Observe reading. If read- ings are identical, replace rectifier bridge assembly. Repeat procedure with each of  two  remaining  terminals 3-98