just as boostn said, some cars/trucks just have random issues since everything and anything can fail at any given time. its amazing the quality we have these days with so much emissions and very little faliures when you compare all of the trucks on the road!
I have not looked but if there is a little grommet in there carefully make room to fit the harness. if not youll have to make your own and get a new grommet the side of the hole so it is sealed off properly. I did this on a older truck on the firewall one time. worked well.