Recently, my after market Sony CD player began blowing the factory fuse. I can't find any breaks in the wiring and the ground wire looks good. The radio itself has a second fuse in it and I think this is for the speaker wires, so I haven't checked them thoroughly yet, because that fuse hasn't blown. I had no problems for over a year and can't think of anything I've done recently to cause this. Any help or ideas greatly appreciated.