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Front hub is the dynohub. A lead + earth wire goes to the front light to close that circuit. The curly blue wire is the lead from the headlight to the rear. It's bolted to a connector on the rear of the HT and an internal wire goes through the frame to a similar thing at the BB. From there the wire goes under the rear mudguard to the rear light, which is then earthed to the frame via a bolt to the mudguard stays.
russmeyer
@si_mon628
Is the curly blue wire the dynamo/light power? And so is the frame part of the lighting circuit...?! Which hub is the dynamo? Sorry for so many questions and if it's obvious. Love the rear light transplant, that looks excellent. Bringing old stuff up to date while keeping the original style and parts is very cool.