[campingcpl]

We had that same problem happen to us on a week + trip out to the black hills in South Dakota this spring. On our secound stop on our trip we where sitting in the camper with some family and the lights kept getting dimmer and dimmer. Our converter had started to make some high pitched noises the day before but didn't really think much of it since it had only done it for a little bit then quit. I went out and pluged the truck in and everything was fine. Well for the rest of our trip I had to plug the truck in and charge the batteries at lease once a day. When we got back we had to replace the lower unit in the converter that controls the 12v. It's a fairly easy fix with just removing some screws and and a couple of wires. The lower unit just slides right out and the new one slide right back in. Just make sure you get the right replacement for your converter. From what you said I am assuming that is the problem. I hope this helps.