74 dart has electrical power but no start

I replaced the starter relay and the ignition ballast today and still got nothing when I turned the key (not even a click). I then jumped the terminal on the starter relay and got it cranked!! Checked the other two connections on the relay and grounded out the one with no power to see if it was the neutral safety switch. After doing that, I turned the key and NOTHING. Am I missing a fuse or something? I had someone tell me that they went through six relays from O'Reilly's and finally got one from Dodge and that one worked. Any input?