No start or turn over on 70 Cuda

I have all of the wiring harnesses and wiring back into my car turn ignition and nothing. It will turn over if I jump the starter relay but nothing from the switch. I checked VDC on yellow wire at the starter rely 3.5 vdc. I took the fuse block off and cleaned up connections still nothing checked inside under dash on wires from ignition switch still no vdc at connector. Is it possible that the ignition switch is bad ? any ideas from the mopar crew !
Author: Bama-man