Douglas Bryson

2016 2500 HD Duramax with the Bose system. I'm trying to install an amp to run my door speakers. I'm running from a Linkswell gen5. I've run RCA's to the amp, through 9 wire back to the dash. It appears that the signal is running through 2 channels, left and right. After lots of searching, I've determined that the feed from the factory head unit to the Bose amp in the rear is really only feeding 2 channels that are sperated within the Bose amp then output to the resto respective locations with 6 sets of outputs ( 2 each to tweeter, front and rear doors). I've currently got sound at all speakers, butt no fader control. I know it's wired wrong. Does anyone know the wiring diagram from the Bose amp that feeds the speakers? Keeping the current door and tweeter speakers for now, but preparing for future upgrades to them. Already upgraded the sub to an Alpine Type R 8".