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NAS 7 Blade Round plus NAS 4 Pin Flat Vehicle end Socket
This shows the function of each blade when looking into the connector at the vehicle end for the 7 pin NAS plug. The layout is the pin order for most new North American pickup trucks and the LR3/4.

The colour and gauge of the wires feeding into the back of the plug varies even within manufacturer model lines.

Also detailed is the flat 4 pin layout common on smaller trailers not having electric brakes. This includes most U-Haul rental trailers.
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LR3 NAS 7 Pin Round Socket plus 4 Pin Flat, Vehicle End.jpg
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