Removal dash wiring harness?

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Matthew Jeschke

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I have a mess an audio installer made. They cut into the harness between the head unit and factory amp instead of using a bypass harness. I cannot figure out where... Long story short, I've disassembled most of the dash looking for where they cut in.

Is there a simple way to gain access to the main dash harness and repair the issues for amp line level inputs? Possibly without complete disassembly of dash (I'm down to carcass / plastic framework).
Note the head unit wires tie into what looks like the main harness that traces the metal frame for the dash. The metal frame is the piece that goes from front pillar (in front of doors) to the other front pillar. I drew it's path in red on the photo.

Unfortunately, this truck has been the subject of several hack jobs. I bought it as a rebuild project, so tearing down the dash gave me access to a few other issues. Hopefully also I can address a few of the rattles it has lol

20180429_171718.jpg Inked20180429_171752_LI.jpg
 

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