one of the most frustrating battery issues with my 2006 Tour Master is that the battery compartment is on the street side and the batteries are on stationary shelves and you can't tell how they are hooked up or where.... to get the batteries out takes an act of God to pull the two batteries on the top up over the ledge.... the 2 batteries on the lower shelf are easy to get at (I also believe that the lower 2 batteries are the chassis (engine starting batteries I presume) the top shelf batteries appear to have multiple connections to the batteries, which I would tend to believe are the house batteries due to the multiple connections ... please verify
Jon