+1 on multi meter, should be getting 13+ volts...if not its probably an issue with the alternator under the flywheel cover. Check your battery connections too, might be loose.
If its under warranty, bring it back and have the dealer mess with that.
2012 GMC Sierra SLE 1500 Crew Cab 4x4
2012 Scag Tiger Cat 52" Kawa. FX-691
2012 Scag Freedom Z 52" Kawa. FS-691
STIHL FS100RX Trimmer
Husqvaurna 223L Trimmer
STIHL BR600 Magnum Blower (backpack)
STIHL BG 86 Blower (hand held)
16' x 6' Tandem Axel Trailer