Hi HugeDuallie & moses. A dc to dc convertor can regulate the output. I
use one to maintain 13.5v to my car computer mp3 player. Anything from
9 to 12v comes out at 13.5. Holds 13.5v at eng startups is the best thing.
The right pulley sizes can make the alt run at 4,000rpm at town speeds.
Cheers !