Gotcha. Guess I never realized that a YJ came with a 3rd brake light. My first thought when I seen it was that it may be for some type of switch to let you know the gate was open, or maybe to turn on the interior lights. Kinda like what is in the door jamb on most vehicles. But since the other part of it is not on my Jeep, I really wasn't sure. So, thanks @j-mox for clearing that up for me.