Car won't start - bad ignition switch?

1. Use a test light or voltmenter to see if you are getting approx battery voltage to the yellow lead on to the starter relay when you turn the key to START (crank); that is the +12v sent from the ignition switch to activate the starter relay. If not, then look at the ignition switch and the yellow wiring between the starter relay and the ignition switch and through the firewall connector.
2. If above checks good, then short the starter relay terminal (the one with the wire with the brown wire with yellow trace) to ground. If it starts with that, then the transmission neutral safety switch is bad or the brown-yellow trace wire is broken.
3. If it still does not start with the above, then bypass the starter relay. Jumper from the large stud on the starter relay to the small stud on the starter to momentarily activate the starter, be in Park and stay away from th fan. This will pull a bit of current so use a large jumper lead. If this works, replace the starter relay. If not, repalce the starter.

(BTW, I am going off of a '70 Dart schematic......)