Battery to RV wiring identification

RidgeRunner24 wrote:
[img][/img]Hi, I'm doing a battery upgrade and moving batteries off tongue of trailer to front storage bay for solar system set up.
Need help identifying a extra 12 gauge wire coming off battery fuse converter tongue connection,daisy chained to another fuse with a 12 gauge wire black/white that disappears under the trailer.
I have a picture, but don't see a way to add to this note.
thanks, Tom