CK Tools :) The professionals choice when it comes to Electrical Tools
This official sponsor may provide discounts for members
Advertisement - Content continues below
Advertisement - Content continues below

Discuss Outside light mystery in the Electrical Forum area at ElectriciansForums.net

Welcome to ElectriciansForums.net - The American Electrical Advice Forum
Head straight to the main forums to chat by click here:  American Electrical Advice Forum

Hello, new member here with little elec knowledge and a mystery regarding our outside light. Our house is quite old and the wiring is, shall we say, non-standard. We replaced the old light a few weeks ago. It worked fine but was old. There was an indoor switch for it just inside the back door.

When I removed the old light it had 2 live red wires and 2 neutral blue wires going into an old 2-part wiring block in the light. So, unless I'm mistaken, there were two red wires going into the same hole in the wiring block and a single red one coming out into the bulb fitting. Same for neutral. I think the two yellow earth were unconnected.

I tried connecting both live, both neutral and both earth into the new light. When I turned the mains back on the bulb lit up but it would not go off when I switched the indoor switch on and off. The switch had worked fine on the previous light. So we had the bulb permanently on unless we just unscrewed the bulb.

Thinking the two wires meant there were two switches, we tried all the other indoor switches but with no success.

Then, thinking that perhaps 3 of the wires came straight from the mains with no switch, we tried detaching one of the live and one of the neutrals in different combinations. We found that the light only went one with one of the pairs of live and neutral - let's call them Live A and Neutral A. Both B wires, or either A/B combos failed to light the bulb.

On paper it seems the switch is the problem but it worked fine with the old light and we haven't touched it.

Any suggestions? Many thanks!
 
Aico 3000 Range
This official sponsor may provide discounts for members
Advertisement - Content continues below
T

Toneyz

Did you not take a photo or got a diagram of what the original wiring was to the old light. Also, did the old light have a pir?
 
D

Deleted member 26818

Sounds like one pair of wires is the live feed, and the other pair the switch feed.
I would have expected the live from the live feed to be made off in a connector block along with one of the switch feed wires.
Then the other switch feed wire connected into the live terminal on the light.
 

Pete999

-
Arms
Esteemed
Get hold of Mr Sparky to help, faffing around with combinations of wires and switches will end up in total confusion, a sparky with test equipment should sort it out in about 10 minutes, you know I'm right.
 
Last edited:
T

Toneyz

Is this not a three core and earth cable with the yellow over sleeved with red as you state red cables and blue cables. Without some sort of visual help, it is just guest work.
 
  • Thread Starter Thread Starter
  • #6
No and no
Sounds like one pair of wires is the live feed, and the other pair the switch feed.
I would have expected the live from the live feed to be made off in a connector block along with one of the switch feed wires.
Then the other switch feed wire connected into the live terminal on the light.
Hi SpinLondon,
Sorry to be slow, what colour wires from which the switch feed go where? The red into the live terminal on the light and the blue goes...where?
 
D

Deleted member 26818

Is this not a three core and earth cable with the yellow over sleeved with red as you state red cables and blue cables. Without some sort of visual help, it is just guest work.
Sounds like it’s wired in 3 core.
2 reds, 2 blues and 2 yellows.
 

ipf

-
Mentor
Arms
Esteemed
No and no

Hi SpinLondon,
Sorry to be slow, what colour wires from which the switch feed go where? The red into the live terminal on the light and the blue goes...where?
Expecting a bit of transcendental meditation and mind reading, I feel.

Get someone qualified to sort it......on site.
 

telectrix

-
Mentor
Arms
Esteemed
if Oakhill is the one i think of in Stoke-on-Trent, I may be over there Saturday. if so, I can call and have a shufty.
 
D

Deleted member 26818

No and no

Hi SpinLondon,
Sorry to be slow, what colour wires from which the switch feed go where? The red into the live terminal on the light and the blue goes...where?
Sorry, forum rules don’t allow me to tell you which wire terminates where.
 

telectrix

-
Mentor
Arms
Esteemed
red to red, yellow to yellow, blue to bits. :D:D:D.
 
T

Toneyz

Sorry, forum rules don’t allow me to tell you which wire terminates where.
You can only assume red is P/L yellow is SW and blue is neutral but without some basic test equipment, it would be only an assumption.
 
Advertisement - Content continues below

Reply to Outside light mystery in the Electrical Forum area at ElectriciansForums.net

Advertisement - Content continues below
Advertisement - Content continues below

Electrical Forum

Welcome to the Electrical Forum at ElectriciansForums.net. The friendliest electrical forum online. General electrical questions and answers can be found in the electrical forum.
Advertisement - Content continues below
Top Bottom