Let's look at how to replace the voltage regulator and rectifier unit.
If the rotor or stator winding fails, the generator must be replaced as an assembly.
Removing the generator.
Remove the rear cover mounting screw.
Unscrew two nuts
Remove the rear generator cover
Unscrew the three screws securing the voltage regulator
Removing the voltage regulator
Check the ease of movement of the brushes in the brush holder and their protrusion.
If the protrusion "A" of the brushes from the holder is less than 5 mm, replace the voltage regulator assembly Brush holder
Check the rotor winding resistance with a tester in ohmmeter mode, connecting it to the slip rings.
If the ohmmeter shows infinity, there is an open circuit in the windings and the rotor needs to be replaced (it is better to replace the generator).
Check the rectifier unit diodes. Connect one wire to the rectifier unit ground and the other to the diode terminal.
Then swap the wires. The diode should only conduct current in one direction. If the diode passes current in both directions or does not pass it at all, it is faulty.
We check all the valves in this manner.
To replace the rectifier unit, use a screwdriver to loosen the twelve contacts.
Unscrew the two mounting screws and remove the rectifier unit.
Reassemble the generator in reverse order.