Oh Wait... I just remembered this circuit has a fuse! The fuse should blow if the circuit is shorted out.
Of course, that's IF the fuse is working properly. I'd try to figure out why it's not blowing. Sometimes people put bigger fuses in if they blow instead of solving the original problem. Or much worse, bridge them out of the circuit.
That's not the source of your trouble though, it's just letting your switch suffer from whatever the real trouble is.
Either way, if your switch is smoking, there's most likely too much current running through it for some reason.
You say it's been converted to 12v, I've never converted one to 12volts, so I'm not familiar with what must be changed during the conversion.
There is a resistor on the switch, going to 12v should make that get hotter than at 6v, but enough to smoke? I doubt it...
But, I guess not knowing what's normally done in a 12 volt conversion, I can't really help here!
All I can say is that if your lights ARE working through this smoke, I'd focus on that resistor. A short should be extreme, and disable the lights.
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