Horn wire colour?

Apr 19, 2022
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Hi folks, this is my first post.
I have a 2010 Ibiza that I’m tidying up for my son who will be 17 soon.
previous owner thought it would be cool to have a rocker switch beside the handbrake for the horn instead of using the steering wheel…
I’m trying to trace the wiring from the steering column to get it the way it should be. Can anyone tell me what wire colours I should be looking for from the steering column?
And also does anyone know what the brown wire fixed under the torx screw is?
Thanks for reading folks.
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