Joe: Are you using Seatalk?
As Mulf have already said, check your seatalk cable. The way seatalk works is that it is a single cable that goes from one unit to the next. Then another cable that goes from the 2nd unit to the 3rd, and so on. It just daisy-chains to all the devices. By the way, when you pressed standby and auto button, was it windy at the time so you could test it? Just asking.
As Mulf have already said, check your seatalk cable. The way seatalk works is that it is a single cable that goes from one unit to the next. Then another cable that goes from the 2nd unit to the 3rd, and so on. It just daisy-chains to all the devices. By the way, when you pressed standby and auto button, was it windy at the time so you could test it? Just asking.