I suspect the Ott instructions were written for the original bridge, which I also suspect had different electrical connection configuration.
Susan wired her board into the works inside the bridge, but still gets simultaneous operation of board and bridge.
I see nothing in the board or bridge that would delay bridge operation until the warning siren has finished
Bridge motor does operate at 14v AC. THE 3v trigger is what the bridge is supplying. Not sure if the board would work with something different (probably), but it does trigger with 3v.
