JD 440 IC generator questions

[Jake Collie]

This might be a long post...
My generator wasn't charging ( Delco type A 6 volt positive ground 1101859) so I did a few tests. I removed the belt, removed the A and F wires, jumpered A to F and put power to A. I believe this is supposed to motor the generator. The generator tried to spin, but only went about 1/16 of a revolution. I spun it by hand and tried again but got the same results. I removed the generator and put it on the bench and tested for continuity between F and case. I had continuity, so from what I read that isn't good. I took the gen apart and polished the armature and commutator. I tested for continuity between F and case with armature removed and had no continuity. I guess that means the insulators between the F post and case are good. I reinstalled the armature and again had continuity between the F post and case. If I take the brush out not connected to A, I had no continuity between F and case, but as soon as I installed the brush I had continuity between F and case. I also had continuity between the commutator and case. The brushes were wore, but still have a lot of life left in them.
What are your thoughts? If anyone is willing, I would love to call you and chat with someone that knows generators. Thanks.

 

[used red MN]

Here is a link to John T’s Type A generator diagnostics.
John T’s gen charging troubleshooting

 

[buickanddeere]

This might be a long post...
My generator wasn't charging ( Delco type A 6 volt positive ground 1101859) so I did a few tests. I removed the belt, removed the A and F wires, jumpered A to F and put power to A. I believe this is supposed to motor the generator. The generator tried to spin, but only went about 1/16 of a revolution. I spun it by hand and tried again but got the same results. I removed the generator and put it on the bench and tested for continuity between F and case. I had continuity, so from what I read that isn't good. I took the gen apart and polished the armature and commutator. I tested for continuity between F and case with armature removed and had no continuity. I guess that means the insulators between the F post and case are good. I reinstalled the armature and again had continuity between the F post and case. If I take the brush out not connected to A, I had no continuity between F and case, but as soon as I installed the brush I had continuity between F and case. I also had continuity between the commutator and case. The brushes were wore, but still have a lot of life left in them.
What are your thoughts? If anyone is willing, I would love to call you and chat with someone that knows generators. Thanks.

Not sure why power was being applied to the field ? it is already energized from inside the generator . To make current flow and to develop a magnetic field . The F terminal needs to be connected to chassis. When motored, should spin "fast" with no field current and slower with field current

 

[Jake Collie]

Not sure why power was being applied to the field ? it is already energized from inside the generator . To make current flow and to develop a magnetic field . The F terminal needs to be connected to chassis. When motored, should spin "fast" with no field current and slower with field current

Thank you buickanddeere. I am finding out every video you watch on the internet isn't correct.