I need some info. I purchesed a radio shack siren, read through the DIY and found that my 09 Ultra wiring is not the same wire colors as what was stated in the DIY, and when I tried hooking it to the wires that were close to the colors the siren doesn't work. Any help out there? my 3 wiring colors are Gray, Green with brown, and black with green, they are located under the left side cover.

 

You could pop a meter on the wires after you've activated the alarm and determine which are hot.