Just bought a 2004 TJ X, and behind the back seats there's one wire that's not connected to anything. I'm wondering what it's for.. Wire's in the second picture, picture of Jeep included in case it helps. (I know I need to vacuum )
That photo isn't helping much, can you take a closer photo of the wire and possibly its connector? Flipping the rear seat forward so it's not blocking the wire would help too.
Mine came with a few similar wires, and the previous owner told me he thinks it is from a subwoofer that the owner before him installed. I traced one to the positive terminal of the battery, one into the sound bar speaker wiring harness, haven't followed the rest yet.