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LR Electric Trailer Brake C2590 Female Connector
This female connector, C2590, located up above and near the brake pedal is for the Trailer Electric Brake Controller hookup.

The Black wire in the bottom right is pin #3, the ground. The Blue wire to the left is pin #6, the Trailer Brake Controller output going to the rear trailer socket.

The White #4 wire is the 30 amp fusible link, (Link 6E in the engine compartment junction box), for the Brake Controller 12VDC power feed from the battery. Note that this would make a pretty good power source for CB radios and the like if no electric trailer brakes were required.

Pin #5 is a Green wire from the stop lamp switch, (the control input for the Brake Controller).

This plug is standard on all NAS (LR3) vehicles, but unlikely to be found on the D3 spec units.
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