Re: '80 cb750k Charging system troubles

Posted by nickajeglin on Jul 28, 2013; 7:46pm
URL: http://vintage-and-classic-hondas.81.s1.nabble.com/80-cb750k-Charging-system-troubles-tp4044159p4044164.html

Now I put a different regulator/rectifier on off of my friend's parts bike, and the charging situation has actually gotten worse. ~11.5v at idle, running up to ~12.3v at 5000rpms.

I checked the frame ground, it's in a pretty inconvenient place, but I felt around, and it feels like it has no corrosion what so ever. In fact all the connections look great.

Any ideas? I'm pretty lost here.

Could a bad battery really be the only problem here? It charged off of my cheapo 12v charger ok, so how could it not charge off of the bike if the system is ok? And I'm under the impression that the charging system really should be showing ~14v even at idle.

Edit: I put a voltmeter between the yellow wires coming from the stator and the battery ground, and got like basically no volts, there should be tons, right? Does this imply that it's something in the alternator rather than the regulator/rectifier? Can the stator be bad when the yellow wires all have continuity, and aren't shorted to ground? And how could the rotor be bad if it's getting power from the reg/rect, and it has continuity through the brushes?