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Most trailers have a pair of red lights on each end of the sill, like
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Most trailers have a pair of red lights on each end of the sill, like the Truck-Lite LEDs on this Wabash unit. The one closer to the middle is a tail-stop light and the one nearer the corner is a tail-turn signal. Note that the Innotec LED clearance light is also a turn signal. 

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