hopper_child wrote:one of them. the one that is the extra extruder
That stepper driver is probably dead then. You cannot have stepper drivers powered up with no motor attached..
Now try swapping those middle wires on one of the axis and see if that helps. On a stepper you don't have common.
You have phases and they are usually denoted as A+ A- and B+ B- or A1 A2 B1 B2. You can look at a diagram or the board may even be marked for it's connections. For the motor you would need to google it's model number but most stepper motors follow the same standard pin out of a1 a2 b1 b2.
You can confirm which two wires are a pair by unplugging the harness from the board then shorting pairs together on the harness and turning the motor. If you have the right two wires shorted for a pair/phase then you should feel some resistance when you try to turn the motor. You can also use a meter and measure from wire to wire. The two with least resistance should be a phase/pair.
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