Desperate help with speaker wiring in 2021 s5 B&O. Tracing wires from front doors.

[phocas]

I have quite a bit of panels removed so i can work on my audio install but I am having a serious issue tracing wires to tap into in the front doors.
I have looked over MANY older (and newer) threads including the spreadsheet.

I cannot run wires through the molex (is there a secret?) so i need to tap into two pairs, front mid range and front mid bass.

For instance, front right door has a 16 gauge to the mid bass and 20 gauge for the mid range. However, when it goes from the speaker connector and gets to the other side of the molex, the mid bass wire becomes 20 gauge and the 20 gauge mid range becomes 18 gauge.

Am I reading this wrong?
272984

I feel like an idiot for not understanding why it goes from a acceptable gauge to almost a fire hazard.

Lastly, why is my 38pin connector not the same as what is listed in the B9 spreadsheet? The newer MIB3? Is there a better wiring diagram out there for the newer version?

My connector at the amp:
272986272991

[phocas]

Well what I ended up doing was running new wires for the mid bass and ill use the 18 gauge for the mid range. What a pain in the rear.

273019273020

[captain_video]

Anytime I install a new system in my car I avoid using the factory wiring completely for several reasons. The wires from the head unit to the amp and the amp to the speakers are rarely a direct connection but tend to go through several connectors in the signal path. This can degrade sound quality and makes it a total PITA to trace any wiring. They like to change color codes from one side of the connector to the other and also wire sizes, as you have discovered. I just run all new speaker wires from the amp to the speakers and bypass all of the factory harnesses.

[Bobby Kinstle]

I have a breakdown of the wiring harness pinout in my B&O Upgrade spreadsheet

https://docs.google.com/spreadsheets/d/1ftkRt8rz1ZgtTtAs-NRYAIkHbtRuhX2cu702CeuqhVs/edit?usp=sharing

There really isn't a need to increase wire thickness unless you are planning to put a lot more power into the speaker locations than they already have