Looked under the dash and didn't see any wires hanging. Popped off that black cover and saw a blank spot for a connector where your pic has a connector already. Found a harness for that type of box (think they call it a z82 style) on Amazon. Going to give it a shot.
Anyone installed a brake controller? I have a 2017 Yukon. Thought it was going to be an easy install. Looked under the IP driver side and don't see any hookup. Not seeing too much on this. Any idea? Thanks.
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