I recently purchased this g8 from a friend. The radio worked flawless. He attempted to hookup aftermarket amp ect. Thus be told the pigtail that goes into the stock amplifier was cut. I have rewired it twice now. They're is no sound from the radio at all after that has happened. All fuses are good. The screen works and all the functions. Just no sound. Front passenger door speaker only produces static/engine noise. Nothing from any other speakers.. Any help or anything would help out alot... I'm not tech savvy when it comes to this. Thank you all to whom helps.