[Cam]

+1 for attempting to start it in neutral, if for no other reason than simple diagnostics.

Why did they add a relay to the US model? Is there some requirement here in the US that would obligate an import to be equipped with one?

EDIT: In my personal experiences (have replaced many faulty starters, and a couple of good ones) there should be a clicking sound, either single or repeated when you attempt to crank the engine over. If there is no clicking, then the starter is simply not being engaged. Most likely caused by an electrical issue. Since you hear no clicking, I am going to advise your starter is fine.