[SPF1061]

Turn key - absolutely nothing happens. Won't crank, no lights, no horn, no fans, no nothing. Behaves as if the battery is not connected. I have charged the battery and it is good. I have checked the battery ground to the frame just below the battery box and it is good. Ground connection from the starter to the frame is good. Any suggestions on what/where to check next. Is there any sort of major relay or main fuse that could cause this? Ignition switch bad?
Thanks for any help.