Join Date: Mar 2004
Location: Roseville (Gateway to the Sierras), CA, USA
Assuming a factory comm system and at the risk of stating the obvious, has the bike been worked on recently or have you had the port side fairing off to work on other wiring and/or have you noticed static when you go over a bump? It's possible the six pin plug under the stingray that connects the comm system to the output plug may have become disconnected. It's a pretty simple fix once you get the port side tupperware off. If/when you find it, plug it back in and tape it together with electric tape.
If not that then.....
Is it a factory comm system? If so, which one and what model year bike? Is the pillion seat wired? If so, check for connectivity there. Do you have another wired helmet you test with? Presuming you checked all the cord connections on yours you could have a short in the input socket or a short in the lower cable. I have had both happen with my factory comm system over the years and replaced both sockets and lower cords at different times. If after checking the fuses it still does work it may well be you have a fried comm unit. Not unheard of with BC1 & BC2.
Bob Morrow #4204
2014 K1600GTLE "Firefly" GTL 4 Two
2002 K1200LTE "Green Hornet" LT 4 Two (history)
"Kyrie Eleison down the road that I must travel"