Bought new tail lights, wiring doesnt exactly match up.

[Lil Ape]

My truck had a generic set of trailer lights on it and i bought the right tail lights for it from brothers. They aren't plug and play, I have to solder them. But I knew that. Didn't want to spend $50 each for oem tail lights just to get the right plugs. The factory tail light wiring harness is showing only two wires, a yellow and brown. And my new tail lights have three. A red, black and white. Now I assume the black is for ground and red is for power, but anyone know what the white would be for? But since there is no 3rd wire on the harness, where would I connect the 3rd wire on the tail lights?