Nope, there are 3 pins: +?-
Now, the ? pin can be either +, -, or unconnected. I don't know which it is. But if it's +, you have ++ and nothing happens (neither good nor bad). If it's -, you'll get +-, and the LED will work. If it's + and unconnected, you'll get no result. Any way you look at it, it can't hurt to try.
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