unidentified exposed wire: what is it?

I recently purchased an '08 4x4 TRD, and while installing a pop-n-lock tailgate wire I noticed a trio of exposed wires hanging down behind my rear passenger-side tire.

Red w/ white stripe
white w/ black stripe
green

These wires look like they're in an OEM wiring harness, and they split off from the wires that continue on to my tail-light.

It may also be important to mention that I have the switch on my dash for the bed power outlet, but there is no power outlet in my bed.

I've been looking for images of the wires related to that outlet, but have been unsuccessful in finding any.

Can anyone confirm these wires are supposed to power my missing outlet, or otherwise identify them?

 

i see it! thanks for the info