If I understand this thread correctly, the grey underdash factory plug contains everything that is required? It has a 12v power and ground, wire to sense brake activation and a wire pre-connected through to the trailer multi-pin plug?
Was this plug designed by the factory for this purpose or is it something that just works? Concerned about over-loading the 12v supply on this factory wire.....
Anybody got more pics of where they put the Red Arc adjusting knob?
So is the diode in the brake light wire needed or not??
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