I called Silverleaf and they ran me through the wiring on the soledoid. When I replaced the White Roders unit I put a wire on the wrong terminal. There is a fused (5A) line that runs from the solar panel for the chassis batteries to the isolator on the chassis side of the unit and then goes to the TM120 unit that runs the bridge (isolator solenoid). I put it on the House side when I replaced the unit so the TM120 never opened the bridge to charge the chassis batteries because it was always reading the House batteries and they were always fine.
If you ever have to change out this solenoid in a New Aire I have pity on your soul. Be prepared to work on your side or on your back while moving several wire bundles out of your way to even see the solenoid. You HAVE to remove all battery connections on both the house and chassis batteries. Newmar loves to run hot wires all over the place and if you don't remove the leads the isolator stays hot.
Once you cut the power you have to remove the unit from the wall and disconnect all the wires and get them back on the correct terminal when you install a new one. Take pictures if you have a swiss cheese memory like I do.
Hopefully, I have not damaged the chassis batteries.