If it's not the battery terminal connection, there's an in-line fuse on your battery cable. It should be between the battery and where the wire actually disappears inside the body of the camper. Depending upon what type of fuse your camper has, it might have blow. Check that too. My camper has the pop-up type fuse. If something happens, it pops, you just push the button and it resets (provided something is not causing it to continue to short out.) My older camper had a fuse, like you'd fine under the dash of your car. My PUP had a fuse that was all contained and you simply had to cut the wires and replace it. So it depends upon the type of fuse you have. Most likely, its either your terminal connections at the battery or the in-line fuse.