Found the slide fuse under the frame
After reading all the comments on the 2109 slide, I crawled under the trailer and found the 30 amp in-line fuse. Sure enough it sits there all exposed to rain and road slop. Forest River should have put this in the storage compartment. As a hopeful fix, I cut the thumb off one of my nitrile gloves that I use for sewer dumping. Stretched the thumb and put it over the fuse. Hopefully this keeps the water out. So far so good.
2008 Ford F-150