Hi Capt. Gadget, here's a few pics for you, I can't steal someone else's thunder, the links were suggested by another member?
The negative from both batteries are connected together, then from one of the negative terminals it goes to the side of the shunt that has the black and white wires, and the other side that has the yellow wire goes to the link, that link then supplies all negative current but it's measured through the shunt. Same with the positive, both connected together at batteries with fuse, then from one positive terminal to the other link with another inline fuse, this link then supplies all positive current. Also connected to the links is the setec, redarc, solar and positive for the bm-1. The heavy cables are 6b&s for battery connections and the links also come with plastic covers as shown. You can buy the links from electrical wholesalers or maybe even Bunnings?
Thanks Burnsy