A buddy of mine recently picked up an 02 Wing at the local dealers. He is experiencing noise, from horn, reverse, and other things through his headsets. The previous owner, had several "extra" things installed on this bike before sellilng it, and removed them, leaviing excess wiring in place. When we installed the CB, we removed the excess wiring and installed per instructions. Now we have the noise. My first thought, is a bad filter, but am unsure how to check it, short of buying a new one and just doing a substitution change.... I know there are three, but can anyone point us toward a specific one???