I have a kill switch under the dash. Works great, problem is I have trouble finding it! Hope the bad guys do too.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:
It looks like the same wire used in this tutorial/how-to on installing an ESP kill switch.