Hi! I have a 2003 Fleetwood Discovery with a Norco refrigerator. Right now we have corrosion on 1 of our 4 house/aux batteries so I cannot rely on them to power the fridge in preparation for our trip. I would like to plug the fridge into a residential outlet via an extension cord. I opened the panel, unplugged the fridge and plugged it in to the extension cord/house but I still have no power to the fridge. Not sure what I am doing wrong. Once we crank up we are good and when we are plugged in at the campsite we are good. It's the 24 hours in advance where I am stuck bc I need the fridge to get cold. Appreciate any guidance or links to instructions. Thanks!