A few weeks ago, I was camping and had my DW close the two slides. We were ready to leave when I remembered there was something inside I forgot to do. DW opened the one slide and I did what I had to. This took all of about 2 minutes to do, when she went to close the slide it would'nt close. The other slide would not open. I even tried plugging into my truck and it didn't work. To my surprise, there were 3 relays between the battery and the body of the trailer which were mounted on the A frame. There was a loose wire and the slides got no juice. Once the wire was tightened the slides worked. Check that first before you spend any money.