First, welcome to the forum and congrats on your "new" purchase. You might try plugging in your tow vehicle, run the engine and then try operating the slide to see if that makes any difference. If it doesn't, you might want to check out your battery - if it is in bad shape and won't take and keep a charge, then this might account for your problem.
You might also want to do a SEARCH on the forum. I assume you have a Lippert slide and mechanism ---- if you type in "Lippert slide" in the SEARCH option found at the top of the Home Page, you will see numerous posts about sticking slides, leaking slides, etc. You might get some ideas from these posts. If you go to the Lippert website, there are manuals that you can download as well.
Hope this helps.
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2008 Cougar 5th Wheel 27RKS
2005 2500 GMC Duramax
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