Honking problem.

So since I've bought my Opel Omega B, it never honked...even once. Finally I decided to change it. After taking off horns, which were oryginal Hella two tones, together with my dad we found out that they are so dirty and rusty, that they won't work at all. One honked a tiny bit later, but the only place where they should end up was junk. I bought one from my mate, used and working, and later my dad found second with lower tone on a junkyard.
We've put them together and had finally completed horn:

After cleaning then and painting with flat black paint, they finally looked well:

 

Yet, they were working but not on the car. What was the reason? Broken electrical installation. So it had to be completely changed into new one, with new, thick cables and put in a way that it won't catch fire, melt or simply rub on anything. After this operation, car got its horn back and I must say that oryginal Hella two tones for Omega B sound great.