If you take the legs too low or especially too high, (coach too high) the fuse will be blown.
Retracting the legs will be a problem if you drive the foot into the stationary leg portion.
Extending beyond 17 inches will also blow the fuse.
The other guys described the fuse location well, behind the battery.
You might be having another problem but almost everyone blows this fuse at least once by driving the legs too far.
Good Luck,