DESTROY.......................stop measuring with your ohmmeter. What you are measuring is meaningless, because you are measuring parallel paths in the circuits going to the rec/reg unit and other loads on the bike. This thread has gone off the rails, with incorrect VOM meter selector positions and some wrong assumptions.
You have two bad rotors. One is open circuit, so it cannot cause over charging. The other rotor has a ground on it, on the end of the rotor winding that is connected to the outer brush. Since the rec/reg unit (on 80 to 84 years only) feeds full battery voltage to the inner brush, full current will flow to the grounded rotor winding, and produce a strong magnetic field. . The regulator could not control, because the rotor has a constant ground on the outer brush end of the winding, and the result is over charging to 16 or 17 volts. I have re-read this whole thread and I edited my post #41 to reflect what I have found out.
Confusion abounds due to the 1970 to 1979 charging system, and the 1980 to 1984 charging system being totally opposite polarity in design.
If the rotor winding on a 1970 to 1979 gets a ground on it, you'll have low or no charging and may blow a fuse.
If the rotor winding on a 1980 to 1984 gets a ground on it, you'll have full constant charging (over charging) or partial charging, depending on where on the winding the ground occurs. In this case the ground is very near the outer slip ring end so 100% of the rotor winding is available to cause full over charging.
Clear as mud right!
Gary's used rotor should get things working.
Lessons learned.......................don't buy Chinese rotors from places such as Mikesxs.
Custom Rewind in Alabama, I believe is still in business , and they do excellent rewinding.