Horn wiring [SOLVED]

[Kimitech]

Hello,
Could somebody help me with the horn wiring.
The relay is switching when I touch the horn on steering wheel, but there is definitely something wrong with the wiring on the horn itself.
Take a look at the picture.
There is just a single green/white wire. I tried to stick it into the second horn with no success.
Any idea how it should be wired as a standard?

Many thanks

[Kimitech]

Solved, please lock the thread or erase.
One of the hidden cable was broken.