Good advice from Gruffy. I might add that these Elect. slide motors are DC motors. You should make sure your 12 Volt system is in good shape, that the converter and battery are operating correctly. Check the Voltage at the Motor. I'm also thinking the Elect. Motor has brushes which may need to be changed. They do wear out over time. If your mechanically inclined you should be able to replace them yourself, unless the Manufacturer has designed them so they can not be rebuilt. If this is the case you'd have to replace the Motor.
Wish you well and Happy Camping
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