On the Thor Owners Resource you can enter your VIN number and in my case there is a diagram in the Schematics for the battery cable hook up and its generic for hooking up 2 batteries, just make sure you connect positive cables to positive posts and negative to negative posts, I have found that they were not real generous when making up the cables and they can be difficult to get connected. It may be worthwhile having longer cables made up , I have considered that but I have taken them in and out so many times its gets easier and now know what goes where.
Hope this helps
Coveman2
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