Stepper Motor wiring confusion
Based on your tests, this appears to be how the coils are wired.

The center taps are connected internally, which is not a problem if you are using a uni-polar driver, they will be connected anyway. However, you will not be able to use a bipolar driver without modifying the motor.

You will need to do more testing to determine the phasing. If you connect a voltage for testing, it must be weak or current limited. If you exceed the rated current you  can burn out the coil.







simulate this circuit &ndash; Schematic created using CircuitLab