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I changed a light switch in my master bath that had 3 black wires into the switch. I kept them oriented in the same way on the new switch, but now the light in my hallway bathroom doesn’t work. Why is this ??? I haven’t changed any other wires and I have checked the breaker. House was built in 1977
 
TL;DR
Changed switch it master bathroom and now hallway bathroom light doesn’t work
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telectrix

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Mentor
Arms
Esteemed
does the hallwaylight work when the bathroom light is on? if so you have the wiring at the switch wrong.
 

telectrix

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Mentor
Arms
Esteemed
your posts are contradictory.i post #1 you said the hall light did not work. in post 3 you say the bathroom light is not working.
 
your posts are contradictory.i post #1 you said the hall light did not work. in post 3 you say the bathroom light is not working.
I think he means the master bathroom works but the hall bathroom doesn't. Two different bathrooms?
 

Megawatt

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Arms
your posts are contradictory.i post #1 you said the hall light did not work. in post 3 you say the bathroom light is not working.
your posts are contradictory.i post #1 you said the hall light did not work. in post 3 you say the bathroom light is not working.
9393 that looks like a 3 way switch, are you sure you bought the right switch and that possibly be your problem. Sounds to me like you need to hire an electrician because I’m sure the wires are crossed up
 
If you know the orientation of the wires reconnect the original and see what happens.
 

Megawatt

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Arms
I don't see a ground wire connected to that green screw. Or is that optional in the USA?
If you know the orientation of the wires reconnect the original and see what happens.
Freddo if the house is very old yes they didn’t pull grounds back in the day. That light switch has 3 wires one of them is hot the other 2 probably go to the hall and bath room
 
  • Thread Starter Thread Starter
  • #10
So I got the hallway bathroom back on, but now the master shower doesnt work. I bought a line tester, one black is always hot the other two dead. When I turn on master bedroom light it makes another black wire hot! So the one that is always hot is going to common and the other hot one should go above the common or on the opposite side. But I did buy switch at a habitat for humanity restore, so that could also be the problem. What would the switch name be called? 3 way
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If you know the orientation of the wires reconnect the original and see what happens.
There the other switch away thinking it would be a unplug and plug back in. 🤦‍♂️
 
Freddo if the house is very old yes they didn’t pull grounds back in the day. That light switch has 3 wires one of them is hot the other 2 probably go to the hall and bath room
I am sure I can see grounds twisted together in the back box.
Post automatically merged:

So did the original switch turn both lights on at the same time. I'm no expert with US switches but I agree with @Megawatt that looks like a 3 way switch.
 
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Megawatt

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Arms
So I got the hallway bathroom back on, but now the master shower doesnt work. I bought a line tester, one black is always hot the other two dead. When I turn on master bedroom light it makes another black wire hot! So the one that is always hot is going to common and the other hot one should go above the common or on the opposite side. But I did buy switch at a habitat for humanity restore, so that could also be the problem. What would the switch name be called? 3 way
Post automatically merged:


There the other switch away thinking it would be a unplug and plug back in. 🤦‍♂️
Ok you got one light fixed and you say the last wire goes hot when you turn the switch on. Put that wire under the same screw opposite of the original hot wire where you have the hall light then they both will work. I’m convinced you have a 3 way switch. When you get a chance go buy a regular light switch
 
Ok you got one light fixed and you say the last wire goes hot when you turn the switch on. Put that wire under the same screw opposite of the original hot wire where you have the hall light then they both will work. I’m convinced you have a 3 way switch. When you get a chance go buy a regular light switch
This was my thinking if both lights come on at the same time. The black screw should have the hot and the other two are travellers?
 
  • Thread Starter Thread Starter
  • #16
This was my thinking if both lights come on at the same time. The black screw should have the hot and the other two are travellers?
I figured it out ! Took some tape and guess and not check. Still doesn’t make since but everything comes on so I’ll take it thanks everyone
 

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