I have had the TT in my car for over a year and I just helped a friend install his, mine acts different. When I turn the keys to the accessory position the fans cycle and the engine makes some clicking noises. I always assumed this was normal, but his TT doesn't make the car do that. (both same TTs). Plus my car idles a little rough, which I am now thinking may be caused by the TT. Is this normal and if not what can I do to fix it. I am pretty sure I installed it ok, plus I used a harness. HELP, please. Thanks guys.