Saturn SC2 2001

I have a Saturn SC2 that wont turn over. The battery checks fine and when you turn onthe lights they are bright and do not dim when the key is turned. There is a relay click when you turn the key. I have not found a wireing diagram to check the voltage to the starter yet. What else could cause it not to turn over?

2001 SC2
milage 78000
automatic
1.8 dual overhead cam