I have a SON (Schmidt's Original Nabendynamo) hub, as well as a Tout Terrain The Plug, and I've tried using them on a previous tour. I've heard nothing but good things about them both before and after, but it didn't seem to work for me. I had to be going about 16 mph before the plug would reach a wattage that would charge anything, and even by the end of a day, it didn't appear to add anything to my power bank. Some days, after riding for eight hours, the power bank had less charge than it did in the morning!

I get the idea that the wiring was faulty from the beginning, but after the tour was over, I tried re-wiring the thing again and could never get it to work right. But if you take everything off and simply spin the hub and connect it to The Plug, or to a headlight, it works. Notably, one of the wires that goes up through the head tube is fraying, presumably from rubbing against the starnut.

Any-a y'all have a similar experience and know what might be wrong? Maybe I need a power bank that's less picky about charging at low wattage? Or maybe I need to go to a different shop where they'll set it up right?