To replace this kind of switch follow these steps. Black means hot white signifies neutral and green indicates ground.
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Replacing light switch 2 black wires. Change the light switch that operates on both sides of the wall. Then use a voltage tester to make sure that the circuit is dead. If you have a ground wire connect the ground wire to the green screw. The white wires will be connected to each other but not to the switch itself. Connect the black wire to the other brass screw. However if you need to rewire a light switch or a plug socket you may occasionally come across two black wires.
Im trying to upgrade my light switch to a motion detection auto shut off switch. When i opened the outlet box the switch was connected to two black wires. Two white wires were attached to each other. Turn off the power to the switch at the main circuit breaker or fuse panel. If the switch that was there is a standard light switch with two brass screws on it and one green screw you can connect the red wire to either of the brass screws. I have always attached one black and one white wire to fans lights etc and this had me puzzled.
When i connected a black and white it blew the fuse so i stuck with the two blacks trying one. Unscrew the switch from the electrical box and pull it out with the wires still attached. In most cases two black wires will be attached to the switchs two terminal screws. The ground wires will be connected to each other and attached to the grounding screw on the switch. 15 minutes to change. I have a multimeter and will be happy to follow any instructions you all can offer.
2 blacks wires hot lead 1 red wire relay. Unscrew and remove the switch plate. There is no neutral wire connection in most lights switches which makes replacement fairly easyits a simple matter of disconnecting two hot wires from the old switch and reconnecting them to a new switch. The united states has strict codes relating to home wiring including clearly defined colors on the outer casing of the wires. Im replacing this dimmer switch with a regular light switch and i cant figure out how i should connect these wires to the new switch. 2 black wires to switch 2 white wires tied together.
This connection is typically secured by a plastic wire nut.