Gents, I have a radio issue that I cannot overcome. I have a Garmin 300XL GPS/com with a Flight com intercom. I can listen to ATIS, use the intercom with a passenger but I cannot modulate any audio through the radio. All pins tested for continuity. My only thought would be the connector on the back of the Garmin. Has anyone had this problem. Could the pins be too short? FAA signed off last weekend and I would like to fly my 8.