Losing steps/position, again

[dazp1976]

So out of stepper I have 6 wires 2 pairs each with a resistance of 2.4 and two purple wires with a resistance 0.4. The 2 pairs are connected to the drivers and i have (so far) been unable to trace the purple inside the cabinet but they are not connected together and there is no connection between the 2 puple and the other 2 pairs.

I've tried reading around while I'm bored and didn't get very far. All I've got is:
6 wire steppers can be wired Unipolar or Bipolar(series).
My guess is it's in series and NC means not connected?