![]() The resistance between A1 and A2, or between B1 and B2 will be a definitely less than infinite (though more then zero), as they are part of the same winding. Since coils A and B on the diagram above are not connected, the resistance between leads A1 and B1, or between A1 and B2 will be infinite. Bipolar stepper motors have two windings, which are not connected to each other, wired internally like this: If your stepper motor has 4 wires, it is a bipolar stepper motor. How to identify four-wire stepper motor coil pairs with a multimeter ![]() Trial and error may work, but there is a better way! All it takes is a multimeter. First, you need to figure out how the wires are paired to form coils within the motor. ![]() Often though, you will have a motor with no markings whatsoever and four, or six colourful wires sticking out. If you are lucky, there will be a part number on the motor and after some digging around, you will come up with a datasheet. Occasionally you may come across an old stepper motor salvaged from a printer, or an ancient floppy drive.
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