Puzzling Generator

[Jerry Kzoo]

I have a 3 brush generator that I am struggling to get to charge. I have done the following tests:

It motors in a clockwise direction when a battery charger is put on it. It runs slowly, but not smoothly. Kind of like how the Model A motor turns over - erunh-erunh-erunh

When I put the battery charger on the field coils they draw 4.5 amps

When it is on the engine test stand it will pull in the cutout, but will not show a charge on the ammeter with the engine running at fast idle. I have tested the ammeter with attaching a headlight and it shows discharge and tested another generator with this cutout and it shows charge.

The wire from the generator post to the insulated brush is stiff and somewhat restricts the spring action on that brush, but everything else seems good?? I am stumped.

I appreciate all of your expert guidance and hopefully a solution.

Jerry