It may be the connectors, and yes they be can be a bit difficult to remove, they don't feel very substantial and they're often quite tight, however the greatest likelyhood is dirty switch contacts.
The switch is held by a single screw, remove it, (even if you don't pull the connector off), and using some WD40 or similar, squirt into the gaps in the switch while clicking the button in and out.
Switch the ignition on and operate the button, the light should operate reliably, if not then the switch will likely require replacement.
When refitting the switch, smear a dab of grease onto the end of the operating pin, where it contacts the brake lever, it's surprising how much the little plastic pin can wear the metal of the lever.
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If an SV650 has a flat tyre in the forest and no-one is there to blow it up, how long will it be 'til someone posts that the reg/rec is duff and the world will end unless a CBR unit is fitted? A little bit of knowledge = a dangerous thing.
"a deathless anthem of nuclear-strength romantic angst"
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