I am changing from a single horn to twin electromagnetic snail type horns, supplied with the horns were 4 brackets and a upgraded relay, my car is a seicento shumi, do i have a relay and if so where is it located and should i replace it with the new 1 also when the horns are bolted together with the brackets does this connect them both top make them work or do i need to wire both terminals on both horns together or is there an easier way to wire them up , thanks..