Need help with Iginition switch/starter issues

I am having the same problem. Car was running fine and out of the blue. It won't start at the key. It will turn on the accesories but wont turn the starter. I am able to remote star it at the relay. I tryed a different starter relay and made no difference. I replaced the key switch and wire from switch down the column. I switched out ballast resistor thinking that could be it. nothing. I am getting juice from the key to the bulkhead. i will try the test on the nuetral safety switch tomorrow. Although it was brand new, put in 2 weeks ago. and the wire to nuetral safety switch is new. This is a 72 340 Duster automatic. seems to be a common problem. I will post what it ends up being, hopefully it will help other people.