Update: turns out the tail lights I have are off of a 2017 ltz. Some things were different but pgamboa was willing to help me either way! He was super fast at responding and helped me figure out how to get my tail lights working. This guy goes above and beyond for people that aren't even buying anything from him!
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After looking at that kit, I don't think it will work because I got the ltz harness with the ltz tail light assembly
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So after doing some reading it looks like load resistors need to be installed to eliminate the crazy turn signal flashing and error on the dash. I'm wondering which wires in the harness need to be tapped with the load resistor?