I rode at night for the first time the other night, and notice my lights (Tach, Speedo, Headlight, et all) all flicker while riding, getting noticably dimmer and brighter as I drive. It happens while I am at a constant RPM, so its not the revving of the engine doing it apparently.. Is this a problem? Its more annoying really to me... THere is a new battery on the bike this year.
Sounds like a bad ground connection someplace. Check the tightness of the battery terminals and the ground bolt on the frame...wherever that may be.
For the location of the "ground bolt", see the picture and description in the old Battery Ground (http://www.gstwins.com/forum/viewtopic.php?t=920) thread.