Whatever it was made a mess of the wiring bundle.
Does it appear there were any exterior lights on the bumper, a-pillars or anywhere else that may have been removed?
Check the trailer wires near the hitch, also.
Wait, I just found this:
https://www.jk-forum.com/how-tos/a/jeep-wrangler-jk-how-to-install-esp-kill-switch-408280
It looks like the same wire used in this tutorial/how-to on installing an ESP kill switch.
