I just purchased my first boat - 90 Supra Conbrio w/ 485 hours - senior owner. Appears that the radio fell out on the previous owner and I really have not gotton to this project yet, however if you look in the compartment there are many wires just hanging in there FROM the boat TO the radio. Would anybody have a wiring diagram for the BOAT itself. I will be upgrading radio, speakers, & XM in the spring & any help or direction would be greatly appreciated. I don't want to expirement with a new radio as to what color is what. Thanks.