I retired in 1991, don't remember the actual amperage output of that stator and don't have the service manual... I was hoping that another would jump in here with that knowledge.

However, I have no intention of ignoring you and will pass along what I do know.

The parts manual shows the normal 3 or 4 wire rectifier which indicates that the stator voltage output is minimal... 9 or 10 amps, something in that area, and as such, the voltage is not regulated.

If there was a heavy drain on the battery such as a automotive headlight to have the standing battery voltage drop slightly, then with the engine NOT running, to have a Volt Meter hooked across the battery terminals and note the reading... then to start the engine, you might see a rise in voltage... BUT... it will not be a voltage rise such as you would see on the higher 20 ampere stators.

At any rate, it would be unlikely that the voltage would exceed 14.5 volts and that would be after a lengthy time of running.

To observe a actual charging rate (Needle Movement), you would need to install a Amp-meter instead of a Volt-meter. Instructions would be included with the meter.