I don't have a skyslider but for any electrical thing that stops working, a good test is to use a multimeter to see if it is getting power when you turn it on. Since you know where the wires are, this shouldn't be too hard. This test will tell you if the problem is with the skyslider itself or with a switch closer to the battery.
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2008 Liberty Sport 4x4 Automatic
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AtTheHelm Front Recovery System & Roof RackM116A3 Trailer build thread: viewtopic.php?f=72&t=77997