My son has a 2007 5.3l f150. The frame was rusted out and we boxed/rebuilt the frame. What wires run inside of the driver's side frame?
Since the repair, we've gotten an ABS, Brake Light, and an Occasional P062C code.- My code reader also says it is unable to communicate with the ABS system.
I'm wondering if I should redo the wires inside of the old frame or if maybe I melted one or more repairing the frame.

 

Welcome to the forum. I would inspect the harness for any heat damage first. AFAIK the wires are for the fuel pump, FPDM, taillights, back up lights, & turn signals.

 

withiut looking I can’t recall what runs inside vs outside of the frame. But there is a black junction box on frame approx under drivers seat. Id start by looking inside that box (there is a junction plug in it), then inspects forward and back from there.

 

Pull the trim from the bottom of the doorway, both sides, they are full of wires.

 

I was able to protect the wires on that run on the outside of frame but was concerned about what runs inside the drivers channel.

 

As far as I know nothing runs INSIDE the frame rail tube. It should all run on the outside of it either inboard or outboard side.