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Wires are always right.
You just have to know which one is positive and which one is negative.
Some people just plug it in and even though it can only go in one way, some people manage to get it wrong.
So, red = positive, black = negative.
Match wires and you'll be good to go.
There should be at least one wire that is black. THAT wire will be negative. So, by using common sense, the other one should be positive.
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