Well, I don´t want to disappoint you but it´s 100% normal to click, cos
there is a relay but it´s not the power relay. It´s just a gadget that gives to a 9-10V's (I suppose) line the normal amount of 13,5+ V. That's all. When changing side lights & dim-dip lights to side lights & low beam it do clicks. It do gives a sign like if there is the relay we are talking about. It
will click also when you turn the side lights on when ignition contact is on (the right relay on the drawing of the previous page).
You can not trust that guy, cos he sees 126 for first time maybe. And it's normal. I know about a guy in a town 20km from mine, he is a 126 wizard. Listens 3 sec. and says the diagnosis. Separates all the noises in the engine just like that. But about 20 years of experience (before 1989) with mainly 126 and 10 trainings in the factory in Bielsko-biala... Super machinist but 99% not familiar with Alfa for example.
If you don't trust you eyes and the original diagram, go to an electrician and show it to him. But with the clicking test it won't work. With the same test I "discovered" that there is a relay in the ELX of a friend of mine, but why only one!? Then I saw the diagram and it's all clear. There is a relay but only for the main exterior lights switch, not one for low and other for high beam. Better than in the Bis but still a poo...
Here you got the Bis diagram with the dim-dip device:

Now the normal diagram with the power relay:

It makes a big difference!
Sorry for being that tenacious!
Kind regards!
PS:
nice drawing Deyan
Thanks! People call me also Picasso
