Hello, I have a whelen 295hfsa1 siren, I am trying to hook it up to my horn ring for hands free in my 2006 silverado. I can not find the correct way to connect the siren to the horn. Does any one know how to correctly do this, there is a black wire and green wire to the horns, I have tried connecting and splicing to both of these, but every time I turn the siren on, it will automitically activate... Does anyone know how to correct this?