Recently my sisters car battery drained. I replaced the battery, put in the new radio code and everything was running fine for about 1/2 hour. Since then the radio fuse blew and I keep trying to replace with same amperage and even before I stick it in all the way it sparks and blows. This happens both with either the key in the ignition or completely out. It seems that constant power is being thrown to it. Anyone have an idea? Its all stock wiring and radio. Nothing else was touched.

 

anyone?