wire identifecation

[just-n-time]

Hi I know this is not the proper forum to ask this question in but all I ever see in the audio section is visitors, so I am posting here. I am also working on miss Debbie's car stereo I finely ran the wires down in the harness for each speaker, and the sound is great, but I have several wires that are jumper wires, one brown/red stripe and the other is gray/brown, but the real question is the gray with blue in a circle pattern I think this is a wire for dimming the lights but how do I hook it to the radio?