The upper right hand corner of the data sheet found at https://buildyourcnc.com/Documents/PN.SM86HT80-5504B-U(inhouse%20PN.85BYGH450A-47-80)%20(1).pdf labels the coil wires A-D and also by color, which refers to the colors coming off of the motor. Our specification for A+, A-, B+, B- follows the labeling of the driver connections where A+ is coil A's positive lead and the same for the B coil. If you find yourself wiring 4-wire stepper motors without a datasheet, you can easily determine which colors go together with an ohmmeter. Each pair associated with the same coil will have continuity (negligable resistance) between them.
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Wiring the greenBull stepper motors, in the video you say to look at the data sheet for the motor, which is the 651, in the data sheet it shows A, B, C, D, for the colors, and in the video you say A+, A- and so on. Is there a video for wiring the connection to the RedFly that I bought to better explain what I need to do next. I'm using 16c4 SO cord, so I can match color to color on the motor side.