Ive just bought some new seats and they have the 3 pin plugs for the airbags (mine has 2),i know the extra wire is an earth but im not sure where to connect it to ??. My car also has a red plug with one brown wire could i connect the airbag earth to this and what is the red plug for anyway ??(the new seats have the red plug with 2 wires).The new seats are manual with electric lumbar support so does anyone know which colour wires i need to connect up.