sprintsmarter

I have been searching and searching trying to find the wire colors for a 2021 Sierra AT4 non bose 8 inch. I have a 6 channel audio control 6-1200 and want to run the speaker line inputs and then the return wire to the speakers. One wire harness is grey and the other black. I ordered a loop harness from LLJ custom but it is a 2-3 week lead time and I can run the wires my myself if I just knew the colors. I do not believe they are the same as what you all have posted because I looked at the wire harness at the rear doors and the colors are different. Does anyone know how to locate the wire map for the connectors located under the passenger glove box for 2021?