Use the search link! I found numerous suggestions on this. BMW was really no help. I do have some infor I can fax you if needed. I also called Land Rover since their vehicles prior to 2006 are the same and they even didn't know what I was talking about. I am going to make a hook up in the back via the battery and then make a hook up in the front for the brake both with a romex plugs, then when I do haul my trailer I will just plug in the line between. A trailer place in my area wanted $600.00 to run everything from front to back under my carpet but I didn't want someone tearing apart my car.