I am having a very strange problem with my CJ7. I hope someone can lead me in the right direction. Sometimes my Jeep is just totally dead, no power at all, no lights, horn, nothing. I jump it off and it does fine. It will start fine for a while but then all of a sudden everything is dead again. This can happen in a matter a minutes. I can shut it off and then try to turn on the lights and nothing. Any ideas on where to start looking?

79 CJ7/33's/304/3-speed