Abstract: An improved lighted coding switch generates binary coded signals corresponding to selected numerals that are displayed in a window of the switch. The numerals are inscribed on a translucent peripheral wall of an encoding wheel that brushes switch contacts against a printed circuit board to define binary signals as the wheel rotates. When the wheel is at rest, a particular numeral is displayed in the window of the switch and the switch contacts of the wheel define an associated binary coded signal. The symbol that is positioned in the window is illuminated by a light emitting diode that is positioned to irradiate a portion of an annular area defined between the peripheral wall of the wheel and an inner hub of the wheel. The LED is inserted into the switch through an aperture in a back wall and the power wires of the LED are inserted through another aperture in the wall and are conductively connected to upstanding pins of the printed circuit board.