Just reading through this thread as I’ve just bought a 23 M50i that now needs brake controller wiring. In my f15 35d I had to make my harness from the back right to under the dash and had it come out under the radio. I would hook it up to my Teconsha mounted on a cup holder mount. In this G05 all I got to do is go from the plug (already found) and make my harness to come out next to the phone charger.
Pics of my f15 set up that I hope to replicate.
John
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