Life got in my way for 14 years trying to build my 69 Dart. I think the ignition switch and turn sig switch harness runs outside the column so you might be able to do your tests there instead of tearing it all down. Just remember if you unplug the connectors the circuit is broken. You cab get a safety pin or sharp object and pierce the insulation to get a reading on the wires. That way the connectors stay connected. It could be just dirt. Unplug them and look at them then plug back in and see if it works.
