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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.
I was under the impression it couldn't take the full power so needed to be wired from a front light
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.
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@benana
I'm struggling to figure out how I wire this cheap aliexpress light with a rear light.
I've test wired it like pictured by holding black and yellow to the connectors and both lights work.
I'm confused as what the red cable is for as it doesn't seem to do anything. I originally thought it was for connecting the rear light to but that doesn't work.
Is the rear light okay to be spliced directly to the cable from the dynamo? I was under the impression it couldn't take the full power so needed to be wired from a front light but can't see an obvious way to do that.
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