My coach is a 2019 25V, and it seems that the BIRD is not used in this coach, but rather the Isolator Relay Delay device. As far as I can tell there is only one solenoid and it is controlled by the IRD.
When I picked up the unit, new, the house batteries were charged, but after a day or so they seemed to weaken, even though I was driving all day. When I got to my destination I had a 30amp hook up so the batteries recharged. I went through this cycle several times until the batteries would not take a charge. They were being discharged too deeply, but I was not sure what the problem was. When I replaced the batteries I trouble shot the system and realized the alternator was not charging the batteries. I don't think it ever did.
Thanks for the diagram, any advice?
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