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Just went through my tech manual and studied the wiring diagram for a non US/Can bike.
From what i see is that there is only one RED wire that comes from the key switch that feeds the tail light,licence plate light and an extra bulb in the headlight assembly called the "city light". This red wire is fed from 2 sources inside the key switch.. the on mode and the park mode. If it works in Park then all your bulbs, grounds and live systems are ok and it's like Tom said, it's in the switch. The switch is fed 12v by the white wire which should be live all the time. If it was faulty then you would have nothing working. An easy test is with key off, take a jumper wire from WHITE to RED ( Not R/BL)
The US/Can switch appears to work the same except no city light bulb in the headlight system.
Rob
I really suck at electrical so I won't be much help sorry. One thing I know is a lot of those problems could be caused by a bad ground-- have you tried chasing down something along those lines?
Wait, I just re-read your post. So you're saying that depending on the key position the lights will work? Wouldn't that suggest that the key switch is faulty or at least the contacts inside? Sorry if I've misunderstood the problem.
Long story short.
A few days ago my spotlights went suddenly out of life.
So, first thing I did is to check the bulb lights: everything is ok.
So I started to look for the issue, going back along the hot wire, but while attempting at it, some more sh#t came out: the parking lights are no more working, rear and front. 
The weird thingh is that if I switch the ignition key to the "parking" position, those lights work well... 
Actually I've found that the parking light hot wire inside the head light has got no power, when I switch on the key and fire up the engine and lights.
I know that the american (and canadian) version of the bike doesn't have the parking light, according to the manual. But I do sincerely hope that someone of you good fellas can help me out with this issue anyway!
Thanx you all, for your kind replies.
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