I'm gonna **** someone off in the lovely state of Georgia but it's all good! I have blue LED back off lights in trying to wire into the rear tail light...more the less to make it a little more visible when stopping...and I've got A wiring question with these...

The LED lights are only a two wire; using the obvious as one positive and one negative I'm lost as to which wires on the tail light to tap into. I'm looking at a Red/Yellow, Blue and a Black wire...

Assuming Black is the ground; which is the stop light wire? My guess says the Red/Yellow but I want to be sure before I go tap into the wiring!

 

On my 08 black is ground, red/yellow is brakes, the blue is running lights.