Having problems configuring Mach3 and the cnc4pc C8 relay. I've tried almost every configuration and cannot get the spindle motor to run using this relay. I have the output in Mach3 set to port1 pin 17. I'm using a gecko G540 for a driver. I have the relay wired to terminal 5 (output 1) on the gecko540 BOB.

If anyone can help with port & pins settings, etc. , I would appreciate any help that's out there. Starting to pull my hair out on this one. 

Jeff

Check and see if you are getting a signal out of the Gecko.  With Pin 17 in Mach set to active high, when you activate the spindal on the Mach screen there should be 5v on terminal 5 on the gecko.  if not than check to see if there is 5v at the printer port, pin 17.  if there still is nothing the its a Mach setting, if there is then its something with the relay.
Hope this helps some,
Tom