Ok thanks, my motor controller is a KBWS-25D connected manual and also with the computer control have it working with mach 3 4 and also Auggie both with ESS smoothstepper and pokeys57cnc..
I did think i would need a DPDT relay, I also think i would need two 0f them ?
Have the thing apart right now so just though i would try to get motor to reverse, but maybe to much trouble,
with Auggie i write my own code to control m3 and m4 so turning off the spindle before switching any relays would be fairly easy, but only works with the pokeys, not sure about mach4 yet.. is m3 m4 hard coded in mach4 ?.
Thanks gary