That's perfectly normal. You're checking the stator prior to the rectifier. At idle it may be around 16 VAC and it will rise with rpm. The key is the voltages are uniform between phases.
2013 V Star 1300 Deluxe
OEM Tall Sissy Bar
Memphis Shades Fork Deflectors
Bridgestone Exedra Max Belted Tires
Baron's RSTD 7308 bar