My first thought would be an electrical connection. Check all of your connections, especially at the slide out motor itself. It takes a lot of current to move the slides, and if there is any corrosion on the cables, that would probably be your problem. I had the same issue on our last trailer. The slide out motor would only make a clicking sound. After cleaning the connections, everything worked fine. Jerry.
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2005 GMC Sierra 2500HD, Duramax 2WD CC/SB
2013 Cardinal 3030RS full body paint
B&W Companion slider, air bags, EFI Live Custom tuning by So Cal Diesel