I am looking to prank a friend of mine, we want to hotwire his horn to his brake lights or turn signals. I read about this on pirate, where I got the idea. I know that I have to take a wire and connect a lead from the horn realy to a lead on the brake light or turn signal relay. Would i connect a + to a - or what? Yes i know this is immature and stupid, but he has had this coming to him. Any tips appreciated