I found the wires, the wires from the battery are bound up together with the wires from the solar roof plug. Unfortunately, when I tried to pull the wires out they came dislodged from each other (electrical tape was what was holding them together.) So I had to make 2 holes in my pass-thu panel. I got everything connected to the controller in the pass-thru but had not power to or from the battery. After inspecting the disconnect box mounted next to the batteries, I determined that while Keystone may pre-wire to the battery disconnect, they do not put the optional breaker in to connect these wires in the disconnect box. After speaking to the dealer service installer, he said that they pull that positive wire out of the disconnect box and wire directly to the battery. They then put in an all-season 12volt 30 amp breaker in between the controller and the battery. You can pick these up at Home Depot and are much cheaper than rewiring the entire disconnect box to install an OEM breaker.
So will try this in a few weeks when I am back in town. 2021 260uml
FYI, get a wire toner or ask a friend for one.
This is what I used. Plug into the solar panel port on the roof, then start probing by the battery and in the front compartment if you have one. You will find the wires...