2003 Ford F-250 Dash &guages adn radio

My 2003 Ford F-250 has been developing an intermittent problem. While driving the guages will go crazy, radio will die, windows won't work, and then they willl all bounce arond and might be fine for a while. I ahve attmepted to troubleshoot the system by pulling fuses and relays while it is running to duplicate the problem but it will not duplicate it. I am assuming at this point it must be a body module of some sort, any suggestions