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99 tahoe trailer hook up wires

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I need to hook up a 4-way plug and I'm wondering which wire is which. There is a dark green, light green, yellow, brown and a thick white ground wire. Any help?
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I tried that but the lights are siliconed to the trailer and i dont wanna cut through it tonight :(
i know on my trailer, its a 4 wire and i dont know off the top of my head but its got brown, green, yellow, and white. the white is ground, brown is running and then im not sure on the yellow and green which one is which
 
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