89 Sub. not starting

Hello all,

I've got a problem. My suburban wont start today. I have power when I turn the key to on, but nothing when I rotate to start. Ther are no sounds, just nothing. I used a volt meter at the starter and I'm getting 12 volts when the key is in run. I don't have a remote start. I don't know what it could be?

Any suggestion would br appreciated

Brian