In every scheme I have ever encountered, 1-Gnd is White, 2-Brake is Blue.
Thereafter it's not as clear cut.
Usually Green is Rt Turn and Yellow is Left turn.(Not always).
That is why I highly recommend a screw terminal box at the trailer end of it all.
Then you can, with high confidence, Join the two whites, join the two Blues and use probe light to determine all others.
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2010 Cooper Canyon 252FWRLS
2000 F250 SC 7.3 Turbo Diesel
2003 Roadtrek 190
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