Interesting. Good info that I did not know.5 amp fuse in relay box, to the rear of the fuse box, is open. I get phone calls all the time with this question after bikes are jump started. The reason for the low volume is the 5 amp fuse controls the high output amp turn on in the stereo, the cassette, and the memory functions. People get confused about what the function of this 5 Amp fuse is because it is marked as "Back Up" and people think it for the reverse on the 1500.