I found this double pin plug inside the speedo/headlight housing on my 2004 Sportsman 400 (not 2004 1/2). There is a purple wire and brown wire going into the plug and I see no place for this to plug into and I certainly never unplugged it to the best of my memory. Any idea what it might be for? The speedo accepts two different plugs and they are already plugged into the speedo. Appreciate the help.