If you raise the stabilizer jacks up against their stop, you'll blow the fuse. If the fuse isn't in the 12V fuse panel it may be in line close to the switch.
If you don't have ceiling lights working in the slide you may have a pinched or broken 12V wiring to the slide. You may be able to see the wiring feed under the slideout.
Nights camped in 2013 - 55, 2014 - 105, 2015 - 63