At first I thought I had a bad one. Connected to the 12V power supply at work and nothing. Played with combinations of wires until I finally got the light. Does not come with wiring diagram. It has 3 wires: white, yellow and brown. White is ground, brown is run, yellow is brake. I hooked it up to my kids 50cc ATV and it works great. The lights are bright enough to be seen when it gets dark.
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