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Not without building a whole rectifier and voltage limiting circuit. The rear LED needs a 6V DC current. The dynamo produces an AC output with much higher voltages - around 60V I believe.
P. S. The fact the front light is still working suggests it's just a loose connection and that the circuits inside the front light are still working. If there's any soldering to do, I suspect its either inside the front light or in the wiring between the two.
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I think shimano hubs come with a resistor. Youre welcome to try wiring mine in if i can dig it out
Edit: oh supernova DC nonsense, nvm
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I had the very same issue so I got in contact with them and they arranged a repair - just had to pay for postage. It also stopped any sort of stand light.
Brommers
Turkish
seager
@Toum
So my supernova pure front light failed and is not sending any power to rear light, but it still shines well. So was wondering is there any way to connect the rear supernova light directly to the dynamo hub? maybe soldering a resistor or something inline (not a electrician, but can solder basic stuff)