1997 Ford F-150 Bad Ground?

I tried to start my truck right after it had just been running and when I turned the key it just made a loud, fast repeating clicking sound. I waited about two hours and tried it again and just got one click when I turned the key. During both of these attempts power was going to everything just fine. I figured it to be the starter or the starter solenoid. A couple of hours later I went back out and when I turn the key nothing would come on as if the battery was dead. The battery and all the connections are fine. Sometimes when I turn the key the radio and lights will come on but quickly go off. What could be causing this?