I removed the ribbon connector from the bottom of a defective pitch board. On the copper ribbon cable from the motor, the three thickest tabs on the right side are for the windings. The next tab is ground for the hall sensor. The next three tabs are for the inputs for each of the three hall sensors. The last tab is for the output from the three sensors. I may have that reversed, as it would make more sense to have three different output leads and a single one for input. I'll find out which is which once I get the wires soldered.
So, I'll solder 30 gauge wires (that's as big as will fit) to each of the pins on the connector. I'll have four slightly worn AAA batteries going to the three sensor inputs to give about 5 to 5.5 volts. Then I'll have the ground lead going to the ground end of the batteries. For the sensor output lead, I may solder it to a 3 to 6 volt light bulb if I can find one. Otherwise I'll just use a voltmeter on them. For testing, once it's hooked up, I'll rotate the magnet on the motor. There should be voltage coming from the sensor three times per turn.
For the windings, the resistance is too low for a regular multimeter to measure. So I ordered a cheap ($18) LC meter to measure inductance between the three sets of windings. If any of the three measure significantly different than the others, then the winding is bad.
It's a lot of dinking around for just one or two gimbals, but if I have problems in the future, it will make testing easier.