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Theres only 3 red wires to my light switch,how do you know which goes where

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Karen, You can do a little testing or just do trial-and-error. (without reading further you might think there are 6 possible combinations, but there are only 3, so read on.) I am assuming that this is a 3-way switch and that in addition to the 3 red wires you also have 2 wires that are connected together (probably white) and a ground wire. I would also assume that the switch only has three terminals besides the ground lug. Going on those assumptions, plus the assumption that you don't want to buy a non-contact voltage tester (about $15, and wonderful to have), here's what you can do--- Two of the wires are travelers (T1, T2) and they are interchangeable. The third wire is the incoming or outgoing power wire (P). If the switch is mounted in a vertical position with two terminals at the top and one terminal at the bottom, P goes to the bottom terminal. T1 and T2 go to the top terminals. It will take up to 3 tries to get the P wire connected to the bottom terminal. It won't hurt anything if you get it wrong (it just won't work right) so just try a combination, turn on the power, and test for normal operation of the two 3-way switches. I hope you found this helpful. Good luck, Al K

Posted on Aug 24, 2010

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Hey Strech it is me again you are probably tired of me asking questions,but you know your stuff.My ignition is the old type acc,off,ignition,lights but there is only 3 wires going to it a red to the left...


The red one should be a power wire that is connected to the battery and provides power to the accessories --run and start positions. The blue one probably goes down to the starter solenoid to activate the solenoid to spin the starter . Black in an auto system normally indicates an earth wire so if it is connected to the battery it should be on the negative terminal. The old ignition switch never had a lights section as the battery light and dash lights got power from the red wire when the switch is in the run position only.

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Separate 1 switch 3 lights


You need separate wire going to each light.
Here are diagrams:
2 single pole switches, before you started to replace
http://waterheatertimer.org/images/2-single-pole-switches.jpg
Single pole and 3 pole to control each light separately: must identify black wire to each light. If each light does not have separate black wire inside the switch box, then it is not possible.
http://waterheatertimer.org/images/single-pole-and-3-pole.jpg
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I hav a Diva DV-603PG dimmer switch that has a black wire a red wire and a red wire with a white stripe. What wire is what?


This switch is for a 3 way system (2 switches controlling one light for a stairway or hallway). The black wire goes to the special coloured screw on the old switch (common). The common wire is either the original live wire feeding the 3 way system or it is the final wire that leads to the light fixture in a 3 way system. All 3 way systems have an either or wires called traveller wires that can be swapped from either end of the 3 way system. the red wire and the red wire with the stripe are to go to the 2 remaining wires that were on the old switch. Those are the traveller wires. If you have a green wire it goes to the ground (a screw at the back of the switchbox or any green or bare wire found in the box)

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1 Answer

I purchased the pr 180 photo electric switch from home depot.there are not any wiring instructions enclosed.I have two black wires and a ground in the wall. there is a green ( ground ) black,red, & a...


Leviton PR180 is a single-pole or 3-way motion activated light switch.
Resources:
http://www.leviton.com/OA_HTML/ibeCCtpItmDspRte.jsp?item=452283§ion=10892&minisite=10026

The green connects to bare ground wire.
The yellow-red is not used EXCEPT to replace 3-way switch. Cap off yellow-red wire when wiring single-pole.

Your single pole switch has two black wires.
One black wire is Hot from breaker, and the other black wire goes to Load.
Turn power on, and test each black wire to bare copper wire. Tester lights up on Hot wire.

Hot wire connects to PR180 black wire.
Load wire connects to RR180 red wire

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For a price, expert works with you while you work on switch or any do-it-yourself project.
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I have a westinghuse fan with light it has four wires on it green, blue, black, and red what are they ie live neutral etc


Question posted under 3-speed switch

1) Are you replacing the 3-speed switch?
This is a field with much discussion because Westinghouse 4-wire fan switches vary.
Process of elimination is needed to find hot line. From there you test each wire to the hot line wire to determine which wire or combination of wires makes up low, medium, and high speed.
Open following links for some resources:
http://waterheatertimer.org/How-to-wire-Cooper-277-pilot-light-switch.html#3-speed
http://www.ceiling-fans-n-more.com/ceiling-fan-pullchain-replacement-and-repair.php
http://www.atlantalightbulbs.com/ecart/catalog/westinghouse-6.html

2) Or are you looking at fan connection wiring at ceiling?
Green wire goes to bare ground.
Fan should have hot and neutral.

Hot line should be black.
Neutral should be white.

Red usually goes to light
Blue is normally not there.

Where is the white neutral wire?

Take multimeter set to read ohms and test black wire to each other wire.
Process of elimination should reveal correct wiring.

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1 Answer

2 switch system. 2 black wires and 1 red wire in the switch. I have hooked up black wire from the switch to the red wire in the box. green wire from switch to black wire from the box and red wire from the...


You posted under ST01C and are wiring timer to replace 3-way switch.
Open following link for specific illustrations:
http://waterheatertimer.org/ST01C-program.html#ST01C
http://waterheatertimer.org/pdf/ST01C-explanation.rtf

1) The timer replaces one of the 3-way switches. The other 3-way switch remains, but must be rewired.
2) The timer must replace the 3-way switch that receives power from breaker box. It cannot replace the other 3-way switch. This is because the timer Black wire must always receive power.
3) The timer blue wire must connect to Load (light)
4) The ST01C red wire is only used when wiring for 3-way.
5) When the red wire and blue wire are connected together, they reverse the timer program. When timer red and blue are disconnected, the timer resumes programming. Connecting and disconnecting the red and blue wires is how the timer mimics 3-way operation.
6) The remaining 3-way switch must be wired so it will connect and disconnect the red and blue timer wires. So the remaining 3-way switch has to be rewired to meet specific timer wiring.

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1 Answer

Cooper Industries Cooper Wiring 274W Switch and Outlet I need help installing this switch/outlet combo...I have 3 wires...a black, a red, & a copper. I hooked the copper to the green terminal, the...


Switch-plug combo:
bare ground goes to green screw
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brass screw goes to load (light)

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You are replacing single pole light switch?
Single pole switch has 3 wires: black and red and bare copper

New device has 4 different colored screws: green, dark, brass, silver
Bare copper goes to green screw.
Black wire goes to dark screw
Red wire to brass screw
Nothing on silver screw for a moment. Test circuit and make sure light turns on-off.
If lights works, then good so far.

Now let look at silver screw. Neutral wire has to connect to silver screw.
In back of your electrical box are white wires twisted together and covered with wire nut.
These are neutral wires.
You must connect another short piece of insulated wire to these neutral wires and run that wire to silver screw.
The neutral wire will complete circuit to receptacle.
If you do not have neutral wire, then receptacle will not work in that box without additional wiring.

Hook up neutral wire to silver screw.
Now turn on power and click switch again.
If circuit breaker trips, then reverse your red and black wires.
Otherwise this should be correct wiring.

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1 Answer

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1 Answer

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The Black 120vac Line In wire goes into "L". The Black wire goes into "2". The Red Wire goes into "3". When you install the switch, the Red and Black wires will be on top of the switch.

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