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Ramsaye-
All dynamos are AC
In general: Alternators are AC. Dynamos are DC (https://en.wikipedia.org/wiki/Dynamo)
Bicycle dynamo hubs are just misnamed; they're almost always magnetos that produce AC.
+/- will be there in case you happen to have a DC producing dynamo.
Greenbank
Halp pls.
Just installing a Luxus IQ2. Hub is a Shutter Precision.
The 'In' terminals on the IQ2 are labelled positive and negative. I can't find anything that describes the polarity of the dynamo connector.
Any idea if I need to match the positive in terminal on the light to a positive terminal on the dynamo hub? If so, which terminal on the hub is the bloomin positive one?!