For what it's worth: I have an '05 FR Grand Surveyor with the enclosed underbelly. I bought this unit knowing that the slide would not work electrically. I had the "I can fix anything attitude". The problem did turn out to be a fuse located near the front of the enclosed underbelly. The factory had actually made a place about 12" square in the aluminum sheeting underbelly for access to and electrical junction box. This square was covered with another piece of this aluminum sheeting and about six pounds of black silicone around the edges. So "Kkleiber
" there just may be a fuse near the front of you unit.