To replace the front brake pads, I had to unplug the
SP SD-8 dynamo, remove the wheel, change the pads, and put the wheel back on.
Now, I have no light 😕It worked before. As far as I can tell, it can only be plugged in one way.
What could it be? Does the plug have to be turned in a certain way?

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Edit: Fixed. One the wires had indeed gone… haywire.