Thanks for the fast replies. Well I didnt mention that I tried it but cant pass the wire through it.

There is a whole at the back of the battery (battery is on the passenger side as I live in uk and not sure if it is diff to the LHD). its fairly big but blocked inside(there is soft thing inside like carpet). when i try to find the whole in the car I cant see anything. there is a whole with buch of cables comin out of it but nothing else. And I cant pass the wire through there as there is no more space for another cable in that whole.

If you can send a pic I will really really appreciate it.