I recently bought an 02 1800. The bike had the harness to plug in a headset so I bought a new headset but can't get any sound. I know the headset works because it works on my Dad's 1200. I plug it in, push the button and get the headphone symbol but no sound. Is there some other switch I need to turn on? I have removed the left fairing pocket so I know the cable is plugged in. Any ideas? pretty sure fuses are all good.