I had an issue with my 2011 fleetwood storm's house batteries. I replaced the batteries as they were 4 years old and I had run them down dry camping a few times and thought that was the problem. same problem with new batteries led me to believe I had a bad inverter. After removing the inverter to make sure I could install the new one myself, I discovered two blown fuses on the inverter. Of course they faced the back wall so you could not see them or access them until you removed the inverter. A $3.00 fix! After new batteries of course.