No crank no spark, nothing is turning on, my fuel pumps not turning on?

I drove my motor home to a gas station, and I turned the engine off, when I went to turn the engine back on nothing happened; no crank, no spark, nothing's turning on, and my fuel pumps not turning on. The battery is brand new. I thought it was that I needed a new ignition switch and an ignition lock cylinder, so I bought one and installed it, still no power. What could cause my engine to refuse to start and no spark or do anything with no noise at all? When I shut it off and then less than an hour later, I turn it back on or I go to turn it back on and it won't do anything. I have been stranded for two days now with no help.