[QUOTE=Bama Rambler;1294783]I'd look for anywhere the wires cross any frame member, or route through the frame members, or other sharp holes. If you don't find it there you can see if you can tell where the wire leaving the power panel goes first and start by unhooking it at the first light fixture, and see if it blows the fuse then. If it doesn't, hook it back up and move to the next one. Unhook it and see if the fuse blows. Keep this up till you narrow down exactly where the problem is between. Then you can narrow it down more once you know that.
Also if there's a junction box under the RV where the wires route from the power panel to the slides, take the cover off it and start unhooking stuff there and testing for the short.
Thats great info, thanks, I will try to locate the main power box when I get back to it on wed. Unfortunately the under belly of the trailer is covered so I will have to figure out where it might be located and how to best access it. Will check behind the fuse panel as well. We took every light in each tipout apart and severed the hot line and tested new fuses but kept blowing them.