I need to find the brake switch to intsall an electric trailer brake controler

Congrats, you have found Ford's super secret fuse that drove everyone mad for years!

We have no wiring diagrams here at fixya. sorry.

you all so need elect brake controler for the dash

The wires would be secured under the rear of the truck. However trailer wiring is only for trailer lighting. Electric trailer brakes require a trailer brake controller.

Hi. There is a grey plug with 6 wires right behind your OBDII diagnostic port on the lower dash board above your accelerator pedal.

The color of the wires on the plug are blue, green, red, white and brown. The wires are as follows:
Blue....electric trailer brake feed
Green....brake pedal switch
Red...12v postitive...always hot
White....ground
Brown....interior vehicle illumination (not used)

The factory wire harness that you will need to attach your brake controller will plug right into this plug. The factory wires are colored the same as above.

After-market and brake conroller wires are colored as follows:
Blue....electric trailer brake feed
Red.....brake pedal switch
White....ground
Black....12v positive

Here you can find information about trailer wires...
- Wiring harnesses & adaptors
- Trailer Wiring Diagram

I hope help you (remember rated this help) Good luck.

I belive it would be the wire that actually sends the control signal to the controller?...correct? well the if so you would need to tap into the wire casing with a test light to see which wire is lighting the test light when the brake pedal is depressed good luck

If the brake conrol iis activating by manually moving the slide lever but not with the depression of the pedel the problem is no brake signal you need to have power to the red wire coming into the brake control. One of the two white wires coming from the brake switch is switched power and you could wire in there. A test light and time will fix your problem.

Battery junction box (BJB) fuse(s):

• 5 (30A) (trailer electric brake controller)
• 34 (25A) (trailer tow turn relays)
• 42 (30A) (trailer tow parking lamps)
• 44 (30A) (trailer tow battery charge relay switch side)
• 63 (15A) (trailer tow reversing lamps