three wires. one is common one is motor & element control circuit, the other is the light.
this is why a control circuit diagram would be most helpful.
there are several routes the manufacturer could take for wiring.
all three wires go back to the control board. one is 120 volt common, one goes to the motor relay & element, one goes back to the light through a separate wiring harness.
one wire comes from the control board with 120 volts on it to the switch. one wire goes directly to the light socket, the other one goes back to the control board.
but you said there are three wires, so, I'd opt they all go to the control board. see attached diagram
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