Something else to check is the current draw for the CD player. Some of the high-power units might have a 15-20 amp fuse, which would indicate that the player needs to be able to draw a lot of power. If that is the case, you need to run another power cable from the CD player to the battery, with a fuse to suit the cable capacity RIGHT NEXT TO THE BATTERY. (Yes, that is important) If you just replace the 10A fuse with a 15-20A one and the wiring shorts somewhere else, you could get into the situation where the wiring gets hot enough to burn before the fuse blows.