Motorcycle Repair: 1976 Honda CB360T Rectifier, honda cb360t, yellow wires

Question
I'm having trouble finding a replacement rectifier that actually works.  My bike is running great, but is not recharging the battery.  My mechanic says it's pointing to the rectifier. I've tried four used ones, two don't work at all and the other two are not providing the full amps needed.  Do you have any suggestions?

Answer
Nancy, the way to check the output is to charge the battery up and then check the battery voltage with an VOM.  You should measure 13.5-14.5 volts when the engine is revved up to 3000-4000 rpm.  If the voltage is low, it could be the regulator but since you have changed it several times, it's more likely to be something else. Check the connector on the alternator output to make sure it's not been hot indicated by signs of melting.  If it looks like it's been hot, you can eliminate the plug by soldering the wires directly or replace the connector with other automotive type crimp on connectors.  

Make sure the alternator stator is okay. Check the resistance between the 3 yellow wires and then from each wire to ground.  There should be equal continuity between the 3 wires and no continuity to ground.    

The only other part that could keep the system from charging is the rotor magnetism. I've seen a few of those loose their magnetism over time but it's pretty rare.

Regards
Rich