First off, I can only ASSUME we are working on a Mopar..Further, I assume it's a Cuda/Challenger...Being that as it may, you need to first check the stupid sh*t like wrong Bulbs installed...You would not believe how many times I've seen this...(Single contactg bulb in a dual contact socket)..
If all ok, next would be the "Wiggle" test. Try to get at the wiring going to your parking lights. look for any frayed wiring, bad grounds, etc.
If all ok, THEN, and only THEN would I be looking at things like the Radio, Dash lights, and whatever else doesn't work..Think of electrical like Xmas tree lights. You can have one little, stupid thing cause all kinds of hell...FINDING that stupid little thing is why you will pay at a shop...