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You have to put a wrench on the rotor where it sticks out of the bell housing and another wrench on the flywheel with a tool that miller makes to bolt onto the flywheel. Break it loose and then pull the engine and rotor as one piece off the welder. Then unscrew the rotor the rest of the way and remove it.
You will need what the factory resistances valuea re supposed to be, cold. Then use a high quality ohm meter with 3 decimal places, disconenct all wires off the stator. Check each wire with a meter to the ground frame, if there is any value, stator is shorted. Then check between stator wires ie L1 L2 and compare resistance value with factory values.
If you see a model that is close in description in the Blue Star models, such as a "145" the wiring diagram should be close if not the same. Otherwise select from the list the Blue Star with the same engine type as yours.
The If the tag is not damaged, and truly a JE series, you can download all the Blue Star manuals to find the one that has your serial number in the range. Miller is good with manuals, but sometimes the cross reference to just serial number does not work.
As long as you have continuity through the stator and rotor windings, and no continuity from the windings to the core, you should be good.
If the brush block was replaced due to it being defective, take a look at the diode and capacitor regulator as well. Using a multimeter, the diode should indicate continuity in one direction, infinite resistance in the other. If you get this, then replace the capacitor. If not, then replace the diode, and likely the capacitor as well.