Lippert Slide Out

The hydraulic ram is probably on the other end of the slide, like mine is. When you push the switch to bring the slide in, does it sound like it's shorting out? The reason I ask is because I had that problem this past summer. My large slide would only come in if I went to the hydraulic pump and used that switch to bring in the slide. It turned out to be the converter went bad and the mobile tech went to the batteries and moved the positive cable into a different position as I had the solar and volt meter positive cables on the same post. He made sure that the positive cable from the battery was on the bottom of the pile. The slide works great now. Just another thought on your problem.