Just to further clarify/confuse things on my French Legere you press the light switch button in toward the column to get the horns to sound, but my Quillery steering wheel centre could be wired as a horn push. There are it seems many variations on a Traction depending on how previous owners decided to play with the wiring 🙂
This is how my switch is wired, sidelights go out when dip or main beam is selected but tail lights stay on:
