1981 cb750 not charging right

Posted by Kevin on May 14, 2012; 5:41pm
URL: http://vintage-and-classic-hondas.81.s1.nabble.com/1981-cb750-not-charging-right-tp3986296.html

So I have an 81 cb750c that I am having battery issues with, I know that the rotors arent the greatest on them, I tested the rotor and it didnt seem quite right, but it wasnt dead completely, and if I put the multimeter on the battery when the bike is on and rev it up a bit the voltage does go up, but only to about 13.4 or so, so my question is, would that come from a bad rotor, or a bad regulator/rectifier? I just want some other opinions before I go out and spend either $110 on a rotor or $90 on a rectifier/regulator
Thanks a ton
-Kevin