Low voltage output from generator

[ocdancer]

Hello, this is my first post.
I have a 35 ford 5-window coupe that I am getting working again. The generator isn't charging the battery. Also the ammeter doesn't show any positive amperage. But it does show about negative 15 amps when I turn on the headlights. I've searched on-line and tried to troubleshoot it. And I only have a voltmeter/ohmmeter for testing.
I disconnected both wires from the cutout, pulled the cover off and was able to trace one wire to the 3rd brush. The other wire seems to be connected to the body of the generator. And one of the field brushes is connected to the back cover of the generator.
The Ohm meter shows 0 ohms between the two wires. Is that right?
The Ohm meter also shows 0 ohms between each wire and the car's chassis. Is that right?
I used the volt meter to measure from each wire to the car's chassis. When I rev up the car the meter goes up to around one volt. And that is at pretty high revs.
I attached pics of the three brushes in the generator.
Thanks for any advice you can provide.