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Yes, you are right. Just looked at my order and they are 12v ones. Thanks for working it out.
The light flickers when the wheel turns but I put that down to me turning the wheel by hand and I thought it would have a constant beam once peddling. I presume it will always do this because of the ac supply.
Anyone want a e-bike light? Got 2 going cheap.
benana
I had a poke around Ali Express and the dynamo ones have spade connectors for the rear lights.
The ones for ebikes have the cable like yours. That listing says it has a horn, which explains the third wire.
This is only an issue if the front light has a switch, because switching it off means the full voltage goes to the rear light. If the front light is always connected then it will be pulling the dynamo voltage down and the rear light will be protected, even if the power isn't actually passing through it.
OTOH I don't know if that light (designed for EBike battery DC) will be happy with the AC from a dynamo.