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Straight to the point... Any ideas where I can get a wiring diagram for a 2017 Sierra Denali with stock bose system?

I purchased a "loop back harness" from LLJ customs which plugs into the adapters that plug into the bose factory amp and send speaker input terminals to an lc7i and provide speaker wire to run from my 4 channel back to factory harness to power the speakers. 

All hooked up and sound is bad. rear speakers sound much different than fronts. Not only is there an audible difference from front to rear speakers but right to left as well. Left (passenger speakers) sound like they are operating on a higher frequency range while right side are sounding a bit more muddy with less highs and more mid range. 

 

The subwoofers also will not hit low notes as they are cutting out in the mid 30's hertz range. Seems as if there may be an error in the harness wiring so I need to begin troubleshooting. The subwoofer channel output must not be getting a full range signal. 

 

Any input is appreciated

2012 silverado ext cab ltz

24" kmc rims

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Bose mids and highs

Iraggi Alt + stock alt in a DC power dual alternator kit

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0 gauge Knu wire

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3 DC 10'' LVL3 with LVL4 parts

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