Well auto zero is working because when it homes it sets everything to zero and if I jog it off the home switch and then by hand move a stepper so that I have now lost stepps and hit ref home when it hits the switch it will rezero the only thing it will not do is if you move off home and hit the zero button then hit ref home when it gets home it will keep the number from where I hit the zero button like keeping a fixture location, I guess I just was thinking about it the wrong way. I still don't understand why it dose not back off the switch unless it is a noise problem and it thinks the switch was unmade which is where my problem started,,,,,,, yea that must be what is going on,,,,,,, why has it run all these years just fine and now it has this noise problem ? Anyway Thanks for the help guys now I can get back to making parts !!!!!!!