Hello Jeffy,
Seems you have a Honda. . .good bikes, had a few back in the day. Scrape mark inside the rotor. . .Does the rotor spin over the
stator ( the ring with coils wound on it) ? or does rotor spin inside rotor where coils are facing rotor? Does it look like part of the
coils have been chewed up? if not. I would not worry about that scrape. could be it has nothing to do with anything.
Now, how many wires coming off the stator? 2 wires means it is a single phase winding. 3 wires and it is a 3 phase winding,
same as a car alternator. If you have a multi-meter, you can set it to ohms and check for a shorted winding or a winding that
is touching ground, if it is chances are it will show signs of having been overheated. You connect one lead from tester to a good
ground, and touch other meter lead to leads from stator, one lead at a time. if you get continuity to ground, stator is bad.
If this test shows no grounds, then what you do is, with engine running, set meter for A.C. volts say 50. and see what kind of
voltage you get at idle, 2,000 and 3,000 rpm and compare these voltages at those engine speeds to what the service manual
says. Also there could be a battery charging fuse, if it is open, battery will not charge. most likely bike has the square fuses in
different colors and have flat metal tabs. if the fuse is clear and you can see a break in the link. it opened on overload, BUT if
the fuse is blackened, it is most likely a short circuit.
If you get some voltage but not what the book says and the rotor has permanent magnets, might need a new rotor.
or it might be a wound rotor with slip rings that come in contact with brushes. A new regulator won't do skwat if the
brushes are shot or the rotor's winding is grounded or open. in this type of rotor there is a winding in the middle and
you have interlocking fingers like fingers on 1 hand between fingers of other hand.
So Jeffy check the stator to see if there are any shorts to ground, if not check for voltage.