Aha, thank you redbaron! I suspected as much, is the salesman circuit source from the Chassis side and is it isolated from the house battery side? I guess what Im asking is if the BIM is the only place where the House and Chassis can connect? If that is the case then it will be easy to just install the DC to DC charger between the two battery systems and just disconnect the control wires from the BIM?
2012 Newmar Dutchstar 4346