For a cargo light 3rdBL,
The red center section wires are: GREEN = POS, BLACK = NEG
The white outer section wires are: BLACK/PINK = POS, BLACK = NEG
For an all red 3rdBL,
Just the green & black are used, same wiring as above ^
Those wire colors are from the OEM harness that's attached to the bulb holder side, but I believe the wire colors are the same going into the truck also.