3rd Brake light wire location in BCM under dash? Or which Pillar..

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niclarsen

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Trying to Install a Factory 3rd brake light on the back of my Go Fast Camper without taking the camper shell off to do it.. Anyone know where i can tap into the original harness from the 3rd brake light? The original on the back of the cab is still there and unplugged, i just unplugged the wires to the diodes in the brake light so i didn't get brake lights kicked back into the cab off the camper. Trouble finding a wiring diagram to see which pillar it goes down and i haven't had luck finding it after tearing some of the truck apart. The only thing left to do is pulling down the head liner to access the harness but I really dont want to do that either!!
Thoughts? Diagrams?...
 

Antho

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I’m not at my desk but if I remember correctly, the harness runs from the front to the rear above the headrest. I can get the diagram in a hour or so.

EDIT: I have this one on my phone but I’ll double check.
DB16951D-2815-4139-A95D-498DB0973674.jpeg
 
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