Quote Originally Posted by m_c View Post
I'd guess only 4 of the wires are for the stepper.
Steppers come in 4, 6 and 8 wire flavours, not just 4, it is possible to connect a 4-wire driver to 6 and 8 wire steppers by externally connecting the circuits to a 4-wire configuration, but if you have a 6 or 8 wire driver you cannot use a 4 wire stepper