I have a 2008 Supra Sunsport 22V. We purchased this boat brand new, and this is our fourth summer riding on this boat. Every since we first purchased this boat, it has had inductance periodically in the radio. When we are riding and listening to the radio, it will randomly start squealing very loudly. It seems to happen when we are using our stereo and the battery begins to charge. This is very embarrassing when we have guests on board, and it is ear piercing. We have a tower with awesome speakers, and we would love to be able to enjoy our radio when we are out on the lake.