The teach wire is only used to teach so it could be cut or come loose and everything works fine. Don’t find out until you try to do a new teach. On large jobs it’s best not to throw around the TECCR so freely and make sure a teach will go through before clearing the config. You can plug the board into the controller directly if you make a little harness and teach just that HN. I’d have to look up how to do it though.