[vangos]

Well it so happened that a similar question appeared in the alfa-digest and a couple of people posted solutions for fixing the switch. I followed Rex Chalmer's advice on cleaning the switch contacts and it worked like a charm:

After removing the cowling (I had to pull the steering wheel to slide the top half off), there's easy access to the contacts that close the circuit which operates the lights. The low and medium beam contacts are at the top rear of the switch and the high beams at the bottom. I took a narrow piece of very fine sand paper, folded it in half and slid it between the contact points. I then used the switch to close the contacts and gently pulled the sand paper out. I repeated this a few times, sprayed the contacts with some contact cleaner to make sure they are really nice and clean and put everything back together.

All in all the process took about half an hour and all the lights work great now.

Vangelis