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Tesla stopped supplying 12V power to the aux pin of the 7 way - Fixed!!!
We ran into this problem with our late-2018 MX. The 7-pin socket couldn't power the trailer or its RF brake controller. Armed with a multimeter, I traced the "missing" 12V aux from the 7-pin socket back to where the towing wiring harness connects to the vehicle. Indeed, the red wire on the side...