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switches work by interupting the hot side of a wire loop, so what you do is you wire your non hot (usually black) wires directly to the device you are trying to control, next, to one side of the switch you connect your two reds, then to the other side of the switch connet the hot lead from your device.

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7y ago
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9y ago

This is a three way lighting circuit switch. This colour combination is not the normal colours for a three way system. They should be red black and white. To replace the switch buy a new one and replace the wires one at a time. Take one off of the old switch and put it in the same place on the new switch. Do this to all three terminals. There are many great diagrams for this type of circuit on the internet. Just search for "Three way switching diagrams".

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To answer this question the type of switch, meaning number of poles on the switch, number of terminals on the switch and how the switch is used in the circuit, must be stated

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Q: How do you connect 2 black and 2 red wires to a new switch?
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New ceiling fixture goes on as soon as power is back even though switch is off?

You switched the power and switch wires. There should be two sets of wires in the ceiling box. 2 black, 2 white, 2 bare. Two groups of three. The white wire going to the light is the incoming wire. The black one in that group is the power coming in. Take that black wire and connect it to the other black wire. The second black wire goes to the switch. The power comes back to the light on the white wire of that set. Connect that white wire to the black wire in the fixture. The switch should work now. That is if everyone wired the house the way it is supposed to be.


How do you connect a 240 v cooktop with 4 wires to a service panel with 3 wires?

The new cooktop has a 4 wire connection. Red & Black are hot. White is neutral, and green is ground. You existing panel is wired with 3 wires. Black & Red are hot and green is ground. There is no neutral wire. Connect the black to black, red to red, and then connect the white and ground together at the plug.


How do you wire an additional light to another light with a switch?

In the wall switch box you should have a white and black pair from your source of power (120 volts). The other pair of black and white wires from the wall box should be going to the light fixture junction box. With the power off, connect the two white wires together with a wire nut. Connect the two bare copper ground wires together making sure that at least one of the ground wires goes under the green screw in the switch junction box. Turn the switch to the off position, no little indicator bump showing on the switch toggle lever. Now take the black incoming hot wire and put it under the top screw on the switch. Hot wires always go to the top of switches. Now put the black wire that is going to the light fixture under the bottom screw. Tighten both. Install the switch into the wall box with the switch handle in the down position. All switches when installed must be off in the down position. Install the switch plate cover.


How do you wire a tri-light bulb table lamp with 3 wire rotary switch?

If the tri-light needs a new lamp holder try any reputable lighting house store. These types of retailers have all of the parts that you need to repair any lamp configurations. The new switch will have a rotary switch built into it just like the lamp had when it was new. There are only two wires to connect to it. Don't disconnect the old one until you have the new one and just put the wires on the same terminals as the they are wires on the old switch.


How do you wire a 3-way dimmer switch that has two red wires and one black and one green when the box has two red and two black?

you can only have one dimmer, the other switch needs to be not a dimmer. the green wire is ground, it connects to a bare copper wire found in the box, or to the box itself, if the box is metal. the black wire is"common" it either connects to the wire found in the box that has power in it or to the black wire that goes to the light. the 2 red wires are"travelers" they connect to the wires found in the box that go from switch to switch. if you don't know how to check which wire does what( continuity), it is possible to keep changinging the connections until the switch works. you will want to do this with a conventional switch, and install the dimmer afer you identify what wires are travelers and wich are common. you will destroy a dimmer switch by searching for the right connection. once you have identified the common wires, it will be on the black screw of a 3way switch; you can put that wire on the black wire of the dimmer. one red goes on one traveler, the other on another traveler. there might be a white wire in the box, if it is connected to other white wires and not to the switch, leave it alone. if a single white wire is connected to old switch, it may be a traveler.you will connect a red dimmer wire to this. opening the other switch location will show you if the white wire is used as a traveler.the black wire has to be either power coming in, or the wire going to the light. the reds are just connecting the 2 switches.

Related questions

How do you hook up one light to one switch in a basement lighting system that has all 10 lights connected to one switch?

If you have good access to the wiring this is relatively easy to do. Each of the 10 lights is connected to another in parallel in a "daisy chain" fashion. Light 1 is connected to the switch, light 2 is connected to light 1, light 3 is connected to light 2 and so forth. Let's say it is light 5 that you wish to switch separately. You can first install the new switch by either adding a new box or modifying old switch box. There are two gang switches that will fit the form factor of a single switch. TURN OFF THE POWER TO SWITCH BOX. Using the same supply input at original switch, add a new black wire to the wire nut for input to original switch and connect this to the input of new switch. Then run a new wire to light 5 and connect black wire to the output of new switch. Connect all the white wires together in switch box and separately connect all bare wires together in switch box. Now at light 5 undo the black and white wire coming from the fixture, and reconnect the wire nuts so that there is a direct connection between light 4 and light 6. Do the same for the ground if present (bare wire). You now have the fixture wires hanging free. Now connect the black wire from new switch to the fixture black wire and white to white and you are done.


How do you replace a neutral safety switch in a 1998 Nissan sentra?

its screwed into your transmission,loosen both wires and unscrew part and screw new one in and connect wires.


New ceiling fixture goes on as soon as power is back even though switch is off?

You switched the power and switch wires. There should be two sets of wires in the ceiling box. 2 black, 2 white, 2 bare. Two groups of three. The white wire going to the light is the incoming wire. The black one in that group is the power coming in. Take that black wire and connect it to the other black wire. The second black wire goes to the switch. The power comes back to the light on the white wire of that set. Connect that white wire to the black wire in the fixture. The switch should work now. That is if everyone wired the house the way it is supposed to be.


How do you connect a 240 v cooktop with 4 wires to a service panel with 3 wires?

The new cooktop has a 4 wire connection. Red & Black are hot. White is neutral, and green is ground. You existing panel is wired with 3 wires. Black & Red are hot and green is ground. There is no neutral wire. Connect the black to black, red to red, and then connect the white and ground together at the plug.


I have a 1984 gmc sierra with power windows and i have several different colored wires hanging from the door. how do i connect these wires to a window switch to get my windows to work?

buy a new truck


How do you change oil pressure switch on a 1995 lincolin mark viii?

Jack up the car or put the front on ramps. Up where the oil filter is located you will see the oil pressure switch, wires coming out of it. Disconnect the wires, unscrew the switch and replace with new one. Then connect the wires and you are done.


How do you wire an additional light to another light with a switch?

In the wall switch box you should have a white and black pair from your source of power (120 volts). The other pair of black and white wires from the wall box should be going to the light fixture junction box. With the power off, connect the two white wires together with a wire nut. Connect the two bare copper ground wires together making sure that at least one of the ground wires goes under the green screw in the switch junction box. Turn the switch to the off position, no little indicator bump showing on the switch toggle lever. Now take the black incoming hot wire and put it under the top screw on the switch. Hot wires always go to the top of switches. Now put the black wire that is going to the light fixture under the bottom screw. Tighten both. Install the switch into the wall box with the switch handle in the down position. All switches when installed must be off in the down position. Install the switch plate cover.


If the old block heater cord of a 1988 Honda CRX had two wires and the new end has 3 which colored wires connect the new connector to the old one?

Connect to two wires you have to the the spade connectors and forget the ground connector. The spade connector wires should be black and white. Black to gold and white to silver. If the wires coming from the heater happen to be red and white, then red goes to black. You could buy a simple lamp cord which has only tow wires.


What happens if you incorrectly connect old black wire to new white wire?

If the wires are incorrectly connected the idea is that it will blow the fuse.


How do you wire a tri-light bulb table lamp with 3 wire rotary switch?

If the tri-light needs a new lamp holder try any reputable lighting house store. These types of retailers have all of the parts that you need to repair any lamp configurations. The new switch will have a rotary switch built into it just like the lamp had when it was new. There are only two wires to connect to it. Don't disconnect the old one until you have the new one and just put the wires on the same terminals as the they are wires on the old switch.


How do you replace the hazard switch Audi a4 1999?

easy job, use small screwdriver prize from dash side to side, this releases clips fit new switch just connect wires and push in...


How do you wire a 3-way dimmer switch that has two red wires and one black and one green when the box has two red and two black?

you can only have one dimmer, the other switch needs to be not a dimmer. the green wire is ground, it connects to a bare copper wire found in the box, or to the box itself, if the box is metal. the black wire is"common" it either connects to the wire found in the box that has power in it or to the black wire that goes to the light. the 2 red wires are"travelers" they connect to the wires found in the box that go from switch to switch. if you don't know how to check which wire does what( continuity), it is possible to keep changinging the connections until the switch works. you will want to do this with a conventional switch, and install the dimmer afer you identify what wires are travelers and wich are common. you will destroy a dimmer switch by searching for the right connection. once you have identified the common wires, it will be on the black screw of a 3way switch; you can put that wire on the black wire of the dimmer. one red goes on one traveler, the other on another traveler. there might be a white wire in the box, if it is connected to other white wires and not to the switch, leave it alone. if a single white wire is connected to old switch, it may be a traveler.you will connect a red dimmer wire to this. opening the other switch location will show you if the white wire is used as a traveler.the black wire has to be either power coming in, or the wire going to the light. the reds are just connecting the 2 switches.