Question about 2003 Ford Expedition
I recently bought a 2003 ford expedition and I am looking for the 4 wire harness that is supposed to hook up to the trailer brake control. The trailer brake control has 4 wires, blue, white, red, and black. I found a 5 wire harness under the dash but I don't know if that's the one to be used. Can someone help?
Their should be a 6 pin conector that only 4 pins are used somtimes a 5th wire is installed for illumination, don't worrie about using that one. The connector is located in one or two different spots, the most popular place is under the dash on the drivers side just below the steering column the connector is grey. The colors are black or red / blue / green / white and sometimes a small black or brown wire is for illumination, don't worrie about that wire. Their are wiring harnasses for sell to hook the brake control through the conector, but if you do not want to buy an adapter hook the wires as followed: Vehicle Brake Control
Black or Red Black
Black is power in to the brake control
Blue is the trailer brake feed
Green is brake signal
White is Ground for the brake control
Posted on Jul 10, 2009
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Posted on Jan 02, 2017
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