ok the steady 12v wire is the power supply for the control board. That checks good!! The voltages you are seeing (4-12) are input voltages to the control board. The control board takes in the input voltages (4 being the slowest and 12 being the fastest) and then turns around and controls the "high" voltage going to the shaft motor. So if you are seeing a change in voltage then you are good up to that point!! So now you need to check the output voltage to the shaft motor. I would test in on the high setting and make sure you are getting your full 36 volts. If you are getting the proper voltage to your shaft motor, then you probably have bad magnets (or brushes, depending on how old the T/M is). Let me know what you find.
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