4 Wire Stepper Motor Wiring Diagram / Stepper Motor 28BYJ-48 5V - TD Gulf : .motor and its wires a and c will be connected to the pins 1a and 1b and the b and d wires but i did have to change the stepper wiring, the illustration shows the wires straight through from the motor into the a4988 called stepper motorknob.

4 Wire Stepper Motor Wiring Diagram / Stepper Motor 28BYJ-48 5V - TD Gulf …