The inline fuse has been replaced by an appropriate breaker that resets (like you have in your car for power windows) and it is live because it will extend. I did the fuse replacement because I had blown a fuse when the trailer was new when I retracted the jacks. I also replaced the fuses with breakers that reset for the large slide and the wardrobe slide as they were conveniently hidden behind electrical center that contains the breakers and 12v fuses.(great Ahmish electrical wiring)DW always leaned on the wardrobe slide too long
There is a crank in the storage area I have never had it out - I thought it was for slide retraction.
Where would the crank fit to move the jacks?