The Pathway, IIRC, was an older version of a
charging relay, these days called a combiner. Andina Marie would know for sure.
Run the AO to the house bank. The ARS5 doesn't have a dedicated battery sense input, but find it and also run it to the house bank or else you'll find voltage drop between the AO and house bank input.
The Freedom has nothing to do with it. It's most likely an older Freedom 'cuz of the Pathfinder, only the relatively newer Freedoms came with built in echo chargers.