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A 3-way switch is used on each end with one or more 4-way switches in between the two 3-way switches. Below is a conventional wiring diagram for a 4-way switch configuration. How To Wire A Light Switch With 4 Wires Google Search Fiacao Eletrica Eletrica Residencial Esquemas Eletronicos The new wire should be black or marked as black per code requirements. Single pole light switch with 4 wires . It provides a stronger connection that is less likely to fail. One of the red wires and one of the black wires supply power to the switch and the other two wires feed the device controlled by the switch. The A wire black connects to the hot black wire from the power source. The C wire red is not used and is capped with a wire. It has four wires coming out of the back. 2 Connect the line black wire on the switch to the line black label wire from the wall. 4-way switch screws or terminals are usually color-coded which includes. With the switch off test for voltage to determin...