I've got a 2004 F250 with extending tow mirrors and a hitch receiver. Not sure if the receiver is OEM or aftermarket. The previous owner had spliced in a 4-pole harness at the rear and did a crappy job of it. I'm redoing his work to set the truck up to tow a car hauler.
Gear to be used consists of:
- 8ga battery power feed fused and pulled from engine bay to rear bumper area by previous owner. Checks out fine.
- Tekonsha Prodigy P3 brake controller that I purchased.
- Tekonsha to Ford OEM controller wiring harness.
- 7-pole and 4-pole (dual) connection receptacle for the truck-side of the trailer wiring.
I've located the harness plug-in point under the dash. I assume that I may have to add the proper fuse to the power distribution block under the hood to get power to the OEM harness plug. Not a problem.
I picked up a spool of blue 12ga wire just in case I need to pull my own power-brake signal wire back to the rear of the truck. I'm cool with doing this if it comes down to that.
My question is: Is there a factory Ford power-brake line taped off and hanging out somewhere along the rear frame rail that I can use for my power-brake signal? I figure there logically has to be one since the Tekonsha harness carries the power-brake signal wire (blue wire) and it plugs into the truck wiring under the dash... otherwise the signal wire would just be a pigtail. Right?
So... I'm guessing it's there somewhere. If so, where should I be looking and what color is it?
Thanks in advance.
