Finally got a new tire carrier/bumper. I'll post about it in a new thread once I get this detail figured out.

I have a third brake light that will mount in the middle of the spare tire. I'm trying to figure out how to run the wiring for the third brake light. I'd prefer it not go through the tailgate at all. Preferably exiting bottom passenger side of the body/tailgate.

My idea was to run the wiring down the kick panel on the right side by the tailgate, then put a small hole in the gasket in the bottom right of the tailgate and run it through there. Any better ideas on where to run the wiring?

 

Well the wiring for the third brake light should already be in the tail gate. Your oem carrier had a brake light. If you want to add a wire to feed the license plate light, you can tap into the tail lamp wire. That's what I did. I tapped the white/purple. I ran my new wire with the oem tail gate wires.

 

This ^.

There's a plug for the factory HMSL behind the vented plastic panel on the driver side of the tailgate. Clip off & solder + to +, - to - of your new harness. Route through the factory plug hole.