Okay so here I am installing a factory cassette radio from a 1996-97 mirage on my 1988 Mitsu. I connected all the wires respectively but I have a blue/white wire left over, I have no idea what it's for. I turn the key on and I have power but I have no sound. I check the speaker wire and rub on the speaker terminals and all I hear is like a static/crackling sound, this only when I rub the wire on the speaker, can anyone help? Thanks for any input!