Get a meter that can test frequency to see what that shows.
Also, get a little lightbulb that will work on the measured voltage and see if the voltage will support a load by putting the bulb in series and watching to see if it lights up. Measure voltage at the same time to see if it stays steady or drops out.
Also, get a little lightbulb that will work on the measured voltage and see if the voltage will support a load by putting the bulb in series and watching to see if it lights up. Measure voltage at the same time to see if it stays steady or drops out.