Mooriartii

I have a 2026 LT Trail Boss with Bose. I am very confused trying to install the GM/Kicker under seat subwoofer kit. The directions want you to tap the yellow/yellow black wire for the front speaker for high level inputs. I do not want to follow those as I want to grab the tap at the Bose amplifier since I don't want to mess up the factory wiring. I picked up a T-harness from Soundgoodstereo that plugs into the 8 pin connector at the amp, I believe x1. This thread started of recommending that. Now question related to this harness, it has four sub wires. I assume one set positive and one set negative. The Kicker amp is only looking for one negative and one positive. Do I just use one set on this harness or do I two positive into one positive and two negative into one positive? Now if I want to use the specified wires in the instructions, is there a T-harness for that? If I could get both then I could test and see which I like better without tapping. Finally is there a place I can get an updated Bose amp pin out diagram? This install should not be as hard as I am making it. Any advice is appreciated. Oh, I will be using the Kicker bass adjust knob.