Not sure if the switch is in the same place on the K5 - on my K1 its just in front of the clutch lever - you cant miss the pair of wires going onto it. Easiest way to rule it out, try starting with the clutch out (in neutral of course) if the lights dont dim then the switch is more than likely OK
Lights dimming would to me indicate that power is getting to the starter motor.. after the bike being dropped, the 1st thing I would think would be engine oil in one or both cylinders. However since the bike was running after it was dropped then you could almost rule that out (could try taking plugs out and see)
And as I've stressed on here before... attempting to turn the engine over with oil in one or both cylinders could lead to all sorts of problems like bent con-rod or head gasket probs.
Pete
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