wire harness help
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Joined: Aug 2010
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wire harness help
I have a 1999 f150 4x4 that I tow my boat which has a 4 wire straight line harness. I bought another trailer which has brakes and thus a 7 wire round harness. How can I convert my 4 wire to a 7 wire???
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Joined: Jul 2005
Posts: 11,931
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not sure about the 1999, but by 2001 the harness going down the frame to the left rear tire had the brake and power wires installed. There is a harness plug on the left frame left of the gas tank. 7 wires in, 4 wires out kind of thing. Yuu can modify it there, or buy a new rear harness to the tail lights and hitch area. Also look under the dash in front of the drivers seat. Might be a plug setup already for the brake controller. Sometimes you can buy the parts on e-bay. You may be missing a relay to make the brakes work.
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Joined: Jul 2005
Posts: 11,931
Likes: 180
