Re: Regulator, how does it break?

Posted by rich on Mar 28, 2012; 9:41pm
URL: http://vintage-and-classic-hondas.81.s1.nabble.com/Regulator-how-does-it-break-tp3865650p3866074.html

Ask your mechanic to test the resistance of the AC generator rotor as described/shown in this thread: http://honda-cb750-s.456789.n3.nabble.com/1981-CB750k-not-charging-the-battery-td3144722.html

There should be at least 4 OHMS resistance between the two copper rings.

This issues you describe, with the battery needing a charge every couple of days, sound like the rotor may be going bad.

An intermittent short in the stator is also not uncommon. There's a test procedure for that in the shop manual (http://honda-cb750-s.456789.n3.nabble.com/NEW-Repair-manuals-April-26-2011-Updated-td685918.html), Chapter 16 of the 79-83 manual covers the procedure for testing the entire system.