I ve been working on this system for a guy that has about 5 acres with an irrigated. Lightning struck the system the other day. I have it all back together now except now one box is faulting the other. He is pumping out of a lake. I disconnected one controller from the pump relay and everything is working fine. What I need to know how to wire both systems to where they do not send a signal back into the other one. The guy at Keelings told me use a 1 way diode.