Need help with 1980 Honda CB750K charging system

Posted by badunkafunk on Jun 08, 2014; 1:11am
URL: http://vintage-and-classic-hondas.81.s1.nabble.com/Need-help-with-1980-Honda-CB750K-charging-system-tp4051753.html

I would like to share with you the electrical problems I'm having with my 1980 Honda CB750K.  I'm about to throw in the towel and take it to a shop so any insight you have to offer would be greatly appreciated!

So the original issue was that the battery was not charging and the bike would die while riding it.  I have replaced every major component in the electrical system.  I'm currently getting a low voltage reading from the battery: 11.8-12 volts resting, 12.6 with throttle.  Right now I'm suspecting that the rotor I just replaced is weak.  Here are my actions taken and current readings:

- Replaced battery with a new agm battery - at fully charged it was 12.6 volts resting (it's gone down a bit from starting and driving)

- Replaced regulator/rectifier - tested good for continuity

- Replaced rotor - currently reading 4.5 ohms between rings (the old one was shorting to the case)

- Replaced stator and brushes - ac was consistent between the three yellow wires but hovering around 16-17 volts which seems low.  no other shorts.