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@PetePerkins, I second the great information. Looks like the C2280D Connector2.JPG only uploaded in low resolution, and it is impossible for my old eyes to see the pinning. From comparing the wiring diagrams you actually ran 2 additional wires to each taillight. And to confirm, you didn't make...

And on the '22 BigBend, it was most certainly there. From a cost perspective, I don't understand why Ford would make that change in the core harness based on LED or Halogen taillights, but it wouldn't be the first questionable change Ford has made. Not sure what would have possessed you to...

This is not correct. As mentioned in my post, I replaced the taillight to body harnesses on each side and the Amber signal light worked properly, so the wire is there part of the way. The issue was with current draw. I attempted a few different settings with Forscan and I tried load resistors...

For others looking for a little more detail: https://www.bronco6g.com/forum/threads/upgrading-from-base-tail-lights-to-obx-led-taillights-questions.66296/page-3#post-2070769

2021 Big Bend with Halogen Tail lights + BLIS. Upgrading to OEM LED taillights. Completed: Swapped out Original tail light harnesses for M2DZ-13A409-G and M2DZ-13K371-G. Made the following Forscan changes in BdyCM: Parameter From To Left Rear Stop & Position Lamp Usage Not Used Stop Only...

Thanks again! I'll update any progress on my end as well.

@RobBob22 - Great info! Curious if you have made any progress? I have a set of OEM LED taillights and I am considering putting them in my wife '21 BB currently with halogens. The fact that the main harness has no LED/Halogen lighting variant, I'm pretty confident your assumptions are correct and...