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Red rectangle marker lights for trailers - $3 (Mead)
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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
The black piece shown is a rubber base that mounts under the light
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