The failure of the generator may be due to failure of the
diode rectifier unit.
Check the rectifier unit to produce Fig. 204 for the assembled
generator stator winding, and detached.
In the healthy transitions rectifier unit switch in position I
lamp should be lit, and in position II must not be lit.
If the switch in both positions the lamp is lit or not lit, it
indicates a fault transitions rectifier diodes, and
rectifier unit should be replaced.