I bought these for my trailer. They are not designed for a four-wire plug. My trailer only has two cables on each side. I had to combine yellow and red together. That means they are both on when I hit the brakes or use my turn signal. I was planning on running additional wires so I could use the reverse lights and fix the problem. Don't buy it if you plan to plug it into an old 4-wire plug. The light serves its purpose perfectly.
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