Here are some more ideas on how to check. The starter switch seems to be the usual culprit. Start the bike to keep the battery charging. You can play with the starter switch without engaging the starter because the clutch lever isn't being engaged. Push the button a number of times and put a little sideways pressure on in different directions too in addition to just pressing it. Push in with a fingernail and slide the nail off so the return spring really pops it out. If the headlight comes on at any time in the process, it's the starter button that needs attention.
If the problem is a connector, there will usually be a discolored spot where one of the connections has overheated. Look for that if playing with the starter button never gets the light to at least flicker.
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