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Discuss advice - two wall nights and one dimmer switch wired wrong! in the Electrical Forum area at ElectriciansForums.net

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Long story short i had a friend helping me out with some DIY today and I have realised that he left the wiring like pictured. I have and voltage tester so i have worked out that the middle red wire is the live one.

Long story short they are now not working (i have tried some variations based on what i have read online but they just leave the lights on). I put them back to the way i found them wired - please see pictures (including the dimmer as i think he messed with that too. Can someone tell me what is wrong and how they need to be positioned/ connected?

and dont worry, i will never let him touch electrics again....

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So does that dimmer fit to those cables and does it switch two lights at the same time.
 

GBDamo

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Supporter
I'm out, I hate lighting that's been messed around with.

I'd need to get my crayons and sketch book out.

Best of luck.
 
  • Thread Starter Thread Starter
  • #5
So does that dimmer fit to those cables and does it switch two lights at the same time.
atm none of the lights are working (current wiring in the picture) but when i tried to fix my friends mess i managed to get the lights on but the dimmer wasn't controlling them - if that makes sense
 

GBDamo

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Supporter
A competent spark wold have this resolved in under an hour.

I think I've figured it out but unfortunately explaining it falls foul of the forum "step by step guides" rule.

Also there are a few pitfalls with lighting circuits that mean it's not safe to offer diagnostic advice.

Generally the feed in should go through the switch then to each light fitting with the neutrals from the light fittings returning to the feed in neutral.

Your dimmer may need it's own neutral, note just because there is a black wire there it may not necessarily be a neutral, it could be an unidentified switched live.

And when someone has been in and messed the whole lot around it just becomes a PITA.
 

telectrix

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Mentor
Arms
Esteemed
time to get a local sparks. £40, coffee, and a grope of the maid. sorted.
 
  • Thread Starter Thread Starter
  • #10
A competent spark wold have this resolved in under an hour.

I think I've figured it out but unfortunately explaining it falls foul of the forum "step by step guides" rule.

Also there are a few pitfalls with lighting circuits that mean it's not safe to offer diagnostic advice.

Generally the feed in should go through the switch then to each light fitting with the neutrals from the light fittings returning to the feed in neutral.

Your dimmer may need it's own neutral, note just because there is a black wire there it may not necessarily be a neutral, it could be an unidentified switched live.

And when someone has been in and messed the whole lot around it just becomes a PITA.
Thanks, I tried making a 'loop' (from the mains in to the dimmer, to the first lamp to the second etc) but it just stayed on. Tbh i am a bit tired, so i will give it another go next week and if i can't get it to work i might just get someone in. What confused me was when i looked online it suggested grouping the 3 live wires together but then i couldn't figure out how the light switch would act as the circuit breaker. :pensive:
 

Baddegg

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Arms
Supporter
Esteemed
Advent Win
You need to stop referring to this person as a friend they not your friend they at home with lights that turn on AND off :)
 
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