stepper wiring in series - are colours of stepper wires variable ?

Hi , I am making some progress on MPCNC - thanks to some advice on this forum!!

My machine is not rectangular- so I haven’t christened either axis X or Y yet,


I have DIY wiried stepper motors (nema 17) in series as per -

On one axis the wiring seems to have worked - motors turn in opposite direction

But on the other axis the motors turn the same way - confusing thing is they are wired the same

I have tried swapping a couple of wires over (the two wires that connect the two steppers ) but quickly cut power as got disturbing sound and heat in driver

I dissconnected wiring and set about testing the motor one by one - the both behave okay when wired to individual cable - they turn in same direction with same input and wired with same colour cable

I tested to see if continuity in wiring on stepper (with no power connected)- both motor behaved the same in that there was zero resistance between blue and red , zero resistance green and black

My question is - Is there any chance one motor has colour wires mixed up ?




Near as I can tell, there is no standard for the wiring colors, so yes, I would say swap the wiring pairs on one motor and you should be good to go.

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Yes, don’t trust colors at all…but the order of the connector counts. 1, 2 ,3 &4. Abce a+a- b+ b-…all the same. But green is sometimes back and so on…china

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There are plenty of standard wire colors to choose from on stepper motors. What’s important is to ignore the wire colors and look at the wire positions instead.

[attachment file=76847]

Notice that the stepper side is a six pin connector with only four wires loaded. The driver side is a four connector with all four wires loaded. Note also that on the driver side the wires are paired as outer pair and inner pair. On the stepper side it’s odd pair and even pair. Here you are looking at Bi-polar Drive Series:

[attachment file=76848]


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[attachment file=78428]
Gotta love standards…

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Hi Folks,

I got it to work by swapping 3 wires over-

see mud map

cheers Ben