TM 10-3930-653-14&P (2)   Ground test It  each  lead  wire  of  armature  coil  (including  neutral wire)   is   non-conductive   with   stator   core.   condition   is satisfactory. If there is continuity stator coil Is grounded. Fig. 4-186.  Testing Stator for Ground (3)   INSPECTION OF DIODE Perform a continuity test on diodes in both directions, using an ohmmeter. A total of six diodes are used; three are mounted on the positive (+) plate, and on other three are  on  the  negative  (-)  plate.  The  continuity  test  should be  performed  on  each  diode,  between  the  terminal  and plate. Fig. 4-187.  Conductive Direction of Diode The  diode  installed  on  (+)  plate  is  a  positive  diode which allows current flowing from the terminal to (+) plate only. In other words, current does not flow from (+) plate to terminal. Fig. 4-188.  Inspecting Negative Diode The diode installed on (-)  plate  is  a  negative  diodes which allow current flowing from (-) plate to terminal only. In other words, current does not flow from terminal to (-) plate. Fig. 4-189.  Inspecting Negative Diode If  current  flows  toward  both  positive  and   negative directions, the diode is short-circuited. If current flows in the  one  direction  only,  the  diode  is  in  good  condition.  If there is a faulty diode, replace all diodes (six diodes) as an   assembly.    (See    below    table.)    These    diodes    are unserviceable. 4-107