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If your car has the tow package installed there should be a grey connector hidden under the carpet forward of the brake pedal.
If not, I'd take the easy way out and find the correct wireless brake controller for the application.
Wireless controllers are laggy and lose connection. I have driven behind an obviously flaky wireless controller trailer and it was a hazard to other drivers. Wired only for me.
Tekonsha has diagrams to help. Even if you don’t have a Tekonsha controller, have a look through their docs to get ideas for your controller. What brand and model controller are you using?
Mercedes SLR McLaren 722 S Is Extremely Rare Example Modified by McLaren
Slideshow: A one-of-one U.S.-spec Mercedes-Benz SLR McLaren Roadster became even rarer after a factory-backed transformation at McLaren's headquarters.
