1979 Other Nissan Models Car won't start again.

I can't figure it out. I have a 1979 Datsun King Cab 620. I put in a new alternator, starter, new wires and a new ignition. I also put in a new relay. I checked the fuses and they are fine. I can hot start it by touching the wires together from the relay or the starter, but it won't start from the ignition. I don't know what else it could be?