As I was figuring out the wire routing, at one point, I had just about every single piece of trim in the back removed. Luckily, I figured out I could tap into the power outlet on the passenger side of the car for the amp remote on feature. With some quick taps, it went by super quickly afterwards. I gave up on trying to solder (especially with the thicker cables). The butt connectors made life way easier as well. All lessons learned.
