I just bought a new to me Ultra. I had intercom on my Yamaha, so I called Sierra Electronics where I bought my IMC headsets to ask if they will work on the Harley. Jeff is who I spoke with, and he said yes and rattled off the item # for the lower cable I would need to adapt it. To make a long story endless, it comes in the mail, I hook it up and I get lots of radio volume, but no intercom. I read the owners manual and made sure the intercom was on, and pressed PTT button to turn on the mic, but no luck. Does anyone here know what's wrong?