low/no charging

I am going out on a limb here. Near the bottom of the top alternator picture I see exposed field windings on the rotor. It looks like the wire enamel insulation has been abraded, or burned. It may have happened if a tool was used there in disassembly, or a hot spot due to a winding short. Since I am looking at a picture, I cannot be sure. Testing turn short is often inconclusive, one turn shorted is very bad, but cannot be discerned from the large number of other turns. Motor shops have a growler for such tests, it energizes the magnetic field of the rotor plates, if a winding turn short exists it will vibrate and make a growl. I also see some grooves in the flat brush plate, and signs of heating. For perhaps a low mile alternator, guessing from other cleanliness, it seems excessive. That often happens with a field short. I also think the rotor looks recyled, painted, and not new in comparison to the other parts.

I think at this point, your problem cannot be solved on the internet.