I have an ACE 27.1 and the controller is in the bin next to the batteries below the slide. When you find yours make sure it is mounted with the wires facing down. The one in my unit had the wires and open controller facing up. Also Thor missed a very good portion of foam sealer for the wires going through the side of bin to the controller. One day the slide did not go out and I removed the control box and a few ounces of water came out. Water and electronics don't work well together. I had to replace the controller and mounted it the right way.
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