Had to use auxiliary start on 2002 endeavor something happened and lost house 12 v now only have when engine running, and isolated relay delays in battery bay kicks on, all power lost with key off. Inverter was not attached batteries charged can get power if the solenoid is jumped connecting coach & house batteries take jumper off loss of house battery no power and salesman switch does not appear to be working,aux switch will connect both sets of batteries if turned on and stay on as long as you don’t let go of switch if you do power off again. Looking for help who may understand why this is happening thanks any help greatly appreciated