Well my White Rodgers solenoid was toast.
Paul replaced it and added a small box to the house batteries that also connects to the chassis batteries and charges the chassis batteries whenever the house batteries are charging.
So now all my batteries charge whenever driving, on shore power, or on Gen power. The funky little solar cell is no longer connected.
Also on pre 2005 TS's turning the ignition key to the start automatically connects the house and chassis batteries to crank the engine.
Wow what a difference