A short somewhere along the system .. proper size fuse which by your post you’ve tried replacing and it blew again .. check any simple easy to see connections for looseness , broken wires that could be grinding out … isolating certain system parts like speaker from the system may find the problem area .. one area to check is the wires interning each door for broken wires .. .. other than the simple visual checks you’ll be trading wire with ohm meter etc.My 04 srt the radio is blowing the fuse any insight on this problem? Thanks