I installed a brake control in my 04 f150. it plugged in under the dash into the OEM plug..I bought A 7 plus 4 trailer connector plug and plugged it into the OEM 4 flat plug under the bumper.I need to know were in the truck do I connect the blue wire for the trailer brakes and the black wire for the trailer accessory.

Sarge


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That doesn't sound right - I think you need to go farther back in - above the spare tire somewhere - and disconnect the existing 4 wire plug and plug in a 7 wire harness into the socket up there.

 

I have the same year. You need this kit, I think. Not sure what all you have installed now. You also need to add a relay which comes with this kit. The instructions are for the earlier years, but should give you and idea.

The Kit

How to install it

Edit: You might want to get the adapter cable as well. You will need to find the correct one for your controller. Here is another one, just plug it in.

 

When your done you can have access to both 4 and 7 pin connections.

 

I did what you said Gene. I had the control plugged in already I just did not know were to pickup the two wires for the brakes and accessories for the 7way. It was as illustrated,I hooked the blue to the blue and the black to the big orange wire. Don’t know if it all works will have to wait and connect to a trailer when I can.
Thanks
Sarge