Well, you have to find the in and out of each coil.
Spent about 3 hours doing just that today. Didn't find many. Too many turns, too many coils, too small wire.
Then you have to decide how to reconnect them for more of what you want. If you double the V, it will half the current.
I'm expecting the oposite, great volts, no amps.
I'm no expert, But...
I decided 'most' PM motors have cheap magnets. They pump in extra current to make up for it. We spun some of the 24v motors as fast ad we could (1300?), and they went 6-15v. The guts showed weak magnets. Maybe they were all really old, but a couple (the same) with very large magnets (curved 2X 2X 3/8") couldn't hold up a pocket clip screw driver stuck directly to the magnet.
And I wonder if some of the brush type motors were a tad out of phase for generating power. Meaning, when the coils were really being effected by the magnets, the brushes weren't connecting them to the output anymore. Possible I just lost track of which wire was which.