My 1974 Challenger had all these issues when I bought it. It was set up to start with a button.

I spent hours testing all the wires, voltages, values. I made my own harness and switched to an aftermarket ignition.

I still had the same results. I tore the ignition switch and related switches out of the coloum for individual tests.

Still not resolved, but that is because the car is in the paint shop at this time.

If the problem doesn't want to be fixed, a button will go back in

Too many cars, too many parts, too little coin, too little space to work in, too little time left to make it all happen! Update: down to one ride, still too many parts, a little more jingle in the pocket, gaining space, and it's going to happen this year!