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NAS 7 pin + NAS 4 pin Flat Trailer Socket
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This is the vehicle end of the NAS trailer harness that is located behind the removable plate centered within the rear bumper by the towing loop. Re the four pin flat connector, from the bottom, the exposed bare lower pin is the ground, usually the White wire on a NAS trailer. The next pin up is normally a Brown wire on a trailer and is for the Tail Lights. The third pin, normally a Yellow wire, is the left signal light; the top pin, normally a Green coloured wire, is the right signal light.
Re the round connector, from the notch in the plastic surround, clockwise, the first blade is ignition controlled +12VDC battery power, (only alive when engine running), and on the Land Rover factory harness is an Orange wire; on a NAS trailer, usually Red but perhaps a Black wire.
Next blade clockwise at 3:00 o'clock above, is the Right Turn signal light, a Green wire on the LR harness, and also on a NAS trailer.
At 5:00 o'clock, the next blade is for the Electric Brakes and is Blue on both the LR harness and on a NAS trailer.
The Ground wire is next, White on both the LR harness and on a trailer.
At 9:00 o'clock above, is the Left Turn signal, Yellow on both the LR harness and on a trailer.
The last blade to the left of the line up notch is the Tail Light circuit. On the LR harness, the wire colour is Brown with two White stripes and on a NAS trailer, Brown.
The centre pin is for the Reverse Back Up lights and is Black on the LR harness and often Purple on NAS trailer wiring but can be Black also.
Note that when the socket assembly is installed on the 3, the notch in the plastic surround is on the left - that is rotated 90 degrees anticlockwise to the picture above. In other words, When installed on the 3, the 4 pin flat connector lays horizontal and is located below the round socket.
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