i know everything to connect and charge the cap be4 installing. only thing which i wanna know is... the cap which im having is a 12-24v so there is a preset to regulate the stuff. and the manual says just twist it and make it to 12v or 24v. i need to know how can i do that? i didnt fix it to ma sound system cz of this problem as i donno how to figure out how much to twist to make it a 12v. the cap also got a display. (this is the 1st time im fixing a cap to a car audio) i need help.