tweakie and Gerry, thanks for your help,
I can code in cobol, fortran, C, C++ and Oject Pascal, but I can't read Sanskrit, Hieroglyphics or Schematics!
![Grin ;D](https://www.machsupport.com/forum/Smileys/default/grin.gif)
Finally risked creating some blue smoke and connected the FP48 PW IN +V to the I0+, Connected another wire to the PW IN 0V to one of the probe wires and then connected the
other probe wire to the I0 -. No smoke! I0 is pin 13 so set Mach3 probe to port2(smooth stepper 2nd 25 pin)pin 13 active low. When probe is tripped the probe LED comes on and the Mach3 probe LED lights as well.
I hate circuits, they make me feel stupid.
![Tongue :P](https://www.machsupport.com/forum/Smileys/default/tongue.gif)
Thank you guys for your patience.
RT