These are a 3 wire design and have two brightness levels, dim for marker light and bright for a turn signal.
They don't need to be wired as a 3-wire mode though. You could wire them as simply a marker light (white and red wire for full brightness)
RED wire: Bright
Black wire: Dim
White: Ground
Here's an example of the lights in use: www.youtube.com/watch?v=FyjISxFTPTQ
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