I am in the final stages of combining two generators to make one work.
The generator I have is a Rotax AT131 6V 10 A
Serial No 9784.
One had been sitting in water and one had a broken mounting plate. Both looked quite sad. On disassembly it is looking promising. I have not delt with a three brush generator before and a search led me to http://www.themagnetoguys.co.uk/three-brush-dynamos
and https://www.yesterdaystractors.com/articles/artint4.htm
So I have taken the armature to an auto electrician and it passed a growler test.
![Very Happy :D](./images/smilies/icon_biggrin.gif)
Once the field winding was removed the short to ground was found and the rest of the field winding looks ok with a dc vs ac 0.8A test current. The brushes look like they are able to be restored. All the insulation from the brushes to the field wires had broken down and new insulation bushes will be made for the studs then ready to assemble.
Three questions
the new bearings are like the original and are non sealed. Do I just pack them in grease?
What does the cover for the top smaller bearing look like? I have none just two small holes from where it would have attached.
What does the reverse current relay / charge controller look like for this three brush generator?
Regards
David