[pwerwagn]

The yellow wires are likely for an “emergency start” switch. Usually a momentary switch to allow you to start the truck with the camper batts if they die, or vice versa to start the gen with the truck batts.

As far as it not charging your house batts, I would assume there is some delay box that activates the solenoid after the truck has been running for a predetermined time (60 sec?). My supernova has that, and I found a fuse bad a while back that wasn’t allowing that box to sense the truck was running.

For a simple workaround you can put a switch in the dash to power that solenoid. But I would pull 12v from a keyed ign source that way if you forget to turn it off you don’t drain the truck batts while camping.