Make sure you check on AC not DC .. Some of those SONs don't have rectifiers --
Quote from slo-rider on May 2nd, 2018, 10:29am:I have SON hub dynamo on a used HP Velo StreetMachine that I recently purchased. I don't think it's putting out any juice when I check it with my voltmeter. The headlight doesn't light up either. Are there any bike repair shops in the Ft Worth area that like tinkering with hub dynamos?