This procedure can be found on the OpenBuilds Documentation, for further information click here.

Follow this step if you don't have access to a multimeter. Otherwise, Skip to Step 2.

If the two wires you joined together belong to the same coil, the shaft will become significantly harder to turn by hand.

If that shaft still spins easily, you have not identified a coil yet, and you must try a different combination of wires.

If you join together two wires that do result in the motor presenting resistance against turning, you can label these two wires as belonging to the same coil.