My first paid gig as a mechanic!!

Good for you! Gonna frame that $1 bill?

Lots of "so true" in your post. You'll find anyone with electrical problems thinks you have the answer right there in your head. They don't seem to understand that you need the manual to figure out what should be there and they also don't seem to understand that every vehicle model is different. Also was doing the been there, done that about the aftermarket wiring. In my experience, clear that mess out of the way and you are usually 99% on your way to fixing the problem.