My bike does the same thing. It reads 15 15.5 all the time. I've checked to make sure it isn't over charging and it isn't. When running I see 14 14.5 volts.
Scar's remind us where we have been they don't have to dictate where we're going.
1997 Jeep TJ SE
2011 FLTRU Road Glide Ultra
2010 FLTRX Road Glide Custom (Traded In)
2009 Buell XB12R Firebolt
2008 Honda TRX700XX