I was told it was the Aux 1 switch in the RAM dash. They are not labeled.
I know one is the rear lights and one connects the house and the chassis battery.
Just try the first Aux switch and see if the lights go out.
This thread seems to confirm what I was told. Aux 1 is an ON/OFF switch and Aux 2 is a momentary that just connects the two batteries while it’s depressed.
https://www.forestriverforums.com/fo...sh-177397.html