I believe an S40 is a $23,000 car and it seems that the electrical system IS handling the turn signals fine. I do not see a report of failure in the original post. Maybe the mode of operation is not what is expected by the poster, but there is no failure. The turn signals blink, the dash lights illuminate the dash, etc. So the lights dim a little under the load, I do not see it even as a mild irritant. I've seen this before on other cars. I don't see what the big deal is. I am not even sure if my S70 does this, because if it did I would assume it was normal as long as everything was functioning properly. I usually spend most of my time behind the wheel looking at the road anyway. I don't think this is "outrageous!!!!", sorry.

On second thought, my lights dim when the air pump kicks in about 15 seconds after a cold start - maybe I should sue Volvo for that. Naaah, I'll just enjoy my car and life instead of nitpicking.