I've somewhat confused myself, I had thought the dealer trailer wiring was 6 wires into the 7 pin plug but he wired 7 as shown. I assuming the blue wire hasn't been terminated in the car as I'm installing a brake controller.
So I have eight wires now the thick black one is the one I intend running to the brake controller and hence pin 5 replacing the blue wire. Have I got this correct? and as such blue wire wouldnt be terminated..
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