battery box upgrade

[62car9]

Nice looking job, I’m looking at do that exact same thing going from one 12v to dual 6v batteries. I think I’ll do a Wally word run and see if they have a box to do something like that as well. Two questions though, did you do anything with the whole that the old battery box was installed in, and what is the purpose of the white wires going to that block on the box instead of just hooking the wires either to ground or to the hot block on the RV?

[Lagniappe]

Thanks for pics, nice job.