Yeah, those two black wires connect to nothing, I can see both of the terminal loops in the bottom of the box. Quality control.
The little fuse junction on the left (forward) appears to be the one controlling the emergency brake, that little black box is visible. I can see if I can install a break AFTER that red fuse junction.
As far as the two red wires feeding the left battery, I assume one is from shore power and one is from solar?
Thank you for being helpful, my dealer isn't. And power scares the hell out of me.