'93 Chevy Silverado won't start

Hello,

I have '93 chevy silverado 1500 cab and it was working fine for awhile then sometimes it would start then sometimes it wouldn't. What's happening now is when I turn the key my dash lights up but nothing else happens. It won't turn over at all. I cleaned the battery cables but still the same thing. I am guessing it's the ignition. Any ideas will greatly appreciated.

Earl