MF 135 generator

[danl]

I have a old Massey 135 tractor and the generator has quit.
It is a AC. The brushes are pretty wore out but I don't think that is the immediate problem.
Does anyone know what I should have continiuity to?

With the armature out I have continuity throught the field windings, but not to the case. When I put the armature back in I have continuity to everything.
From the posts to the case, brushes armuture etc. Is this normal or do I have a shorted armature.
If I turn it with a cordless impact wrench I get about .6 volts.

I could replace it with a alternator but I will lose my tachometer as it runs off a gear on the back of the generator.
Any thoughts, I know almost nothing about generators.

 

[danl]

The commuter looks pretty good, I cleaned the mica out of the slots and sanded it.

I have posted here and on a tractor forum and can't get an answer on if I should have continuity from the posts back to the case.

Either no one knows or it's such a stupid question it is beneath an answer

It may very well just be a stupid question