Need some help with diagnosing my car. Young guy learning

is it possible for my ignition module connector to be the culprit? had a buddy sit in the car while i wiggled some wires around and i played with the ignition module connector and the lights turned on for a few seconds as well as the radio. also would like to add that i replaced the ballast resistor and the voltage regulator.
It tells me that your wiring harness is the culprit. A loose connection somewhere. As it’s been suggested before. CHECK EACH CONNECTION AND EVERY CONNECTION.

Start at the headlights and move back wards thru the car. Check it all or you’re going to end up with a toasted Marshmallow in the shape of what was a car