Thank You Pawel66 and CCollum. It is right. From the beginning, there was a foot dimmer.
Yesterday, I looked for about 4 hours for electrical wiring of the foot dimmer.. and found nothing. No white or yellow wire that was lost, loss or cut off. Also the withe/yellow that that starts from the light switch.. I don't see it elsewhere..
On the fuses, I see a big white arriving and a small going away, also a big yellow and small yellow (they go to the front lights)