When I first posted this, you can see I was criticized for using wire nuts and assured my car would catch fire or the head unit would soon break. I was told this was a "hatchet job."
Well this might sound petty but it has been over 400 days since I posted this and I'm happy to report it worked perfectly fine everyday. Today I sold my Tahoe with a perfectly working head unit that never gave me any problems over almost 2 years and over 22,000 miles. I still assert that properly sized wire nuts are not only to code legally in residential / commercial properties and automobiles but extremely durable. They're faster than heat shrink and they can be easily undone and changed by hand without any tools. And if you know the corresponding color connections (like I've provided here) you can save the money of buying a silly idiot-proof "wire harness adapter" from sites like Crutchfield. in fact you can just look up a picture of the wiring harness adapter so that it gives you a cheat sheet of which color corresponds to which. I have no problem admitting when I'm wrong and in this case I genuinely believe I was not wrong.
