Ender 3 problem.

[AutoWiz]

I am an auto mechanic and in the automotive world idle air control valves have been stepper motors driven by PWM circuits since the 1980's. Sorry you seem to be so far behind the curve. If you honestly believe you have an inproperly assembled harness then swap it with the other axis and see if the problem moves. Is that not the smart thing to do here if we are to compare one axis to another in the name of diagnostics?

There is a reality here that is these 2 circuits don't really care which way the power or ground comes. Only that each circuit is complete. A coil will generate an Em field no matter which side of the windings see power or ground. I think this may be what you are choking on.

[peninsok]

I am an auto mechanic and in the automotive world idle air control valves have been stepper motors driven by PWM circuits since the 1980's. Sorry you seem to be so far behind the curve. If you honestly believe you have an improperly assembled harness then swap it with the other axis and see if the problem moves. Is that not the smart thing to do here if we are to compare one axis to another in the name of diagnostics?

There is a reality here that is these 2 circuits don't really care which way the power or ground comes. Only that each circuit is complete. A coil will generate an Em field no matter which side of the windings see power or ground. I think this may be what you are choking on.

I trained as a radio technician from 1958 and moved on to automatic washing machine & refrigeration service before owing an appliance manufacturing business. We did not use stepper motors in our industry. I retired in 2006 and have only just purchased a unit using stepper motors. My training was such that until one knew how an item, in this case, a stepper motor, worked, one did not change anything. I had the stepper motor internals explained to me and it was then obvious that the X-axis motor was incorrectly wired. Copying the wiring of the other motors corrected the problem.
Thank you for your input.