I just put a factory hitch on my 2011 Durango, and it had the wiring harness already on it, I just had to splice the 7 way pigtail at the rear and then plug in the brake controller up under the dash. The turn signals and hazard flashers will not work. Everything else is working fine. Is there a separate circuit I have to tap into to get the turn signals and hazard lights to work on the trailer?