What does install a wiring harness mean, u think????
fuel pump, tail lights, trailer hitch, airbag suspension, etc. there are a ton of things that require a wiring harness near the end of the vehicle. your post was very generic, and didn't say what you were trying to do.
and BeDevil79 is right, i've done the install to my '11. best not to bite the hand that feeds you
what brand wiring harness are you installing, mopar or otherwise?