Rear End Interior to Exterior Wiring Pass through

I think down from the passenger side tail light area from inside would be my best guess.

MountainOtter

My question is where/how can I pass the wire from the cargo area to under the rear bumper, or close to it.

I'm curious about this as well as I'm going to put some extra AUX controlled backup lights in the rear bumper to help when backing up my camper at night. If there's already a passthrough I'd like to use that versus drilling a random hole.

MountainOtter

I'm running a wire to power a hitch mounted wheelchair carrier. I don't feel the wire will be safe from damage off-roading running it under the vehicle. I know where the engine bay firewall passthrough is. My question is where/how can I pass the wire from the cargo area to under the rear bumper, or close to it.

Have you looked under the Bronco? There is a ton of cables and tubes and whatnot running underneath. What’s one more? Just attach yours to the top of an existing bundle- that’s what I did with my trailer hitch power.
Running it inside the cab is a huge pain.

MountainOtter

I'm running a wire to power a hitch mounted wheelchair carrier. I don't feel the wire will be safe from damage off-roading running it under the vehicle. I know where the engine bay firewall passthrough is. My question is where/how can I pass the wire from the cargo area to under the rear bumper, or close to it.

There are several options:
1 - along the wire chase that runs the length of the vehicle at each door sill and then through the cargo area out through the tail light to under the bumper.
2 - same as above but on the passenger side and then out through the wire harness on the tail gate for the 3rd brake light
3 - under the vehicle along the myriad of existing wire harnesses
4 - under the vehicle snaked through the frame rail

I have added a tow wiring harness, rear light bar on my spare and recently an amp & sub so I have significant experience. Running the wires is not difficult but be sure to use proper grommets, wire strain relief and secure all wires to existing structures in a way that will eliminate any chafing or damage to the cables.