Scratch this. I can now confirm that I am an idiot. Red white blue and black do not match up with GM’s red white blue and black. Once I swapped the black and red wires to what they should actually have been it works just fine. Blue matches with blue, white matches with white, curt black...
I can confirm the Curt Spectrum 51170 does not work in a 2023 Yukon XL. You would think 4 wires color coded connected to 4 wires should be a no brainer but once connected the vehicle brake lights turn on and stay on until you pull the 40 amp trailer brake fuse under the hood #63. I have not...
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