I have a 2011 X trim and im installing a map light which it didnt have before. I have cut the hole and the light fits perfectly, But my problem is that i cannot figure out the wiring. Since mine isnt prewired for a map light, Im attempting to tap into the back seat light. However I cannot figure out which wire goes to which connection. The rear light has a 2 prong connector and the ground is through a screw attached to the roof. The front light has 3 prongs and nothing screws into the roof. Any help or advice would be appreciated.