78 w100 – Ignition switch wires tied to new harness

I have a new wire harness through Painless, and I’m having difficulty finding information about my stock ignition switch wiring I’m tying it into.

the most accurate intel I can find shows that I have
starter, ground, ignition, batt 1, batt 2, acc 1, acc2 wires…

my question is how to tie into new harness that only has batt 1 and acc 1?

I’m assuming that the acc 1 is non engine accessories, and acc 2 is power to engine running accessories ( the new harness has a “ignition switches fuse panel” and “accessory fuse panel”), so be I think I know how to wire that.

The 2 batt wires are what are even more so tripping me up. Any explanation is welcomed. Do I wire different or tie the two into one?
Author: nballen_W100