I have a question about the 2 inline fuses that are located near the battery switch in my 2004 Super Air Nautique 210. It appears that one of them protects the stereo amp power, and the other one protects the ignition. Occasionally the stereo amp fuse blows, especially when the stereo is cranked up. They are both 30a dual element fuses. Is that correct or should they be slow blow fuses?