I have no power to any thing in the truck or lighting on the outside. The battery is new and fully charged and tested fine. It sounded like a relay clicking over or a circuit breaker clicking when it happened. Does Any one have any ideas?

 

What, if anything, happened to or was done to the rig right before this electrical issue started?

So, it won't turn over or start either? Where do you have electrical power? What is the status of the main 80amp (or so) fuse in the box under the hood? All other fuses have contimuity across them? All ground wires attached?