[Guy]

Guy, like Michael, I have 2 8D house batteries, and two 8D chassis batteries.  Are you sure there is only one chassis battery?  In mine there is one on each side of the coach just in front of the rear wheels.

Clarke, mystery solved... DUH. 
I am sure that Todd showed me , (andyou told  me ) that I have one chassis battery on the left side, and  one chassis battery on the right side, but I sure forgot about  that. I wondered why the chassis  battery disconnect was in the engine bay, and not with the battery. Now I know. The switch has to disconnect  two batteries in two locations.
I am beginning to think the wife is right.... " I never listen, bla bla"   

Amazing what you find when you go through cabinets for the 10th time.

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He's got two as well just like yours Clark. Sorry been offline for a while. I asked Richard about that button when he was here as well but he was not sure. I know what you're thinking "how could Richard not figure it out". I believe he could but we worked hard that day and my question was at the end of the day so by then I probably had tapped him for too much "teach me teacher" moments. I had lived without ever using that button up to that point so it was not anything I was really keen on figuring out. It does make a clunk noise though. Even Larry my mechanic commented on it once asking me what it did.