Thanks for your responses. The second panel is just like the first..it sends a 24vac out to activate a pump relay.
To clarify, everything in the system works fine, both control panels work, etc. I just havent connected them both at the same time for fear of frying the one that isnt on, if that makes sense,
So, when either of the control panels arent on, the pump is off. If using a relay to isolate is the way to go, can someone post a diagram or list of what goes where? I am familiar with Bosch relays, just havent used them with ac. Just knowing what goes to 85, 86, etc would help.