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Finnean.....thanks for the clarification. I slept on it last night and thought the color coding was probably different. I remembered that the yellow wire was part of the standard trailer wire cluster. One thing with trailers is they have several plugs available. I use the RV style and their wiring guide on all my trailers. Very important to follow installation guidelines so you can get over the counter adapters if you are borrowing or renting a trailer not your own.