Strange trunklid wiring oddity

[bart_dood]

Hey folks,

Going thru my new to me W211 2005 cdi, one of the problems on it was the two license plate lights didn't work, put in new bulbs and one works but the other doesn't.

Did some reading and read about the wiring issue with W211's at the hinge so started re-wiring everything with new wire. Part way through I took a close look behind the plate lights and discovered it wasn't plugged in!

Ok so I investigated more and found a random un-used connector which is not plugged into anything. However it DOES NOT fit the light!

So now I'm stuck, I have a missing plate light connector and I don't see any hacked or cut/missing wires where it used to be anywhere, but instead I have an extra connector that seems to go nowhere.

I should add the plate light connector that is there has 2 wires (power and ground) like you'd expect, but the other connector has 3.

This first post I will attach the photo of the plate light connector that IS there and works.