Howdy!! I'am in the middle of my build and the House, Van battery isolater question is in the design stage. I have been reading to much info on this so I just bought a Blue Sea "BatteryLink" automatic charging relay, with auxilary battery priority # 7611,,and hope it works like there web-site sates.. It is designed to handel 120amp alt output, witch should handel a 7.3 PS diesel stock alternator. It is a new model. Does anyone have any input on this "New Isolator" ..... I will post some photos and let you know if its the anser to the Battery Managment Question.......Brad