I guess the problem was caused due to the weak contact between a lead and multi meter connector ( pin)Open circuit meter leads or a blown current range fuse in the meter would explain the LED not lighting but I don't see how it can stop the magnet ball thing from rotating. (This is why I suspected that the TS had connected the meter incorrectly thus shorting out the output.) It has occured to me that if the drive coil and the generator coil were placed close together (Possibly both on the same laminated feromagnetic core.) to form a crude transformer the power transfer would be more efficient than via the spinning magnet ball thing.
Les.