Wiring for ceiling rose with dimmer switch

[AndyBNorthWest]

Hi all, I am having a problem with two lights connected to a dimmer switch in one room of my house. I have looked through the FAQ/Stickies and can't find the answer.

I am replacing the two lights in the room, one I wired OK (L2 in the diagram), and the other (L1 in the diagram) is proving difficult and I am now stuck! I have no idea how to wire up the cable labelled D in the diagram.

Could someone take a look at the diagram at the link below and offer any suggestions please?

http://www.photobox.co.uk/album/album_fullsize.html?c_photo=1004471812

Cheers!

 

[Spark123]

The link doesn't work, just asks to log in

 

[AndyBNorthWest]

Sorry about that, not used to using photobox.....try this time....

http://www.photobox.co.uk/album/4019087

 

[Spark123]

You say you have wired L2 but has it worked? Where does cable D run to? Are these new circuits?

 

[ban-all-sheds]

Where was D connected before you took down the old light?

Does L1 work with cable D not connected?

Does anything elsewhere not work that used to?

Is D 3-core + earth?

 

[AndyBNorthWest]

No, L2 isn't working as I suspect it's dependent on L1 being wired correctly.

I have no idea where cable D runs to, but the colouring of the wires running in this cable look suspiciously like the sort you would find inside a switch itself. D has a red, blue, yellow and an earth (sorry, I missed the earth off on cable D in the diagram)

These aren't new circuits, all cabling was already in place, I am just simply replacing 2 old pendants with 2 new track lights. Unfortunately the ceiling rose of L1 came apart (with some plaster!) and I was unable to note down all of the wiring of cables A-D in the ceiling rose.

L1 Does not work at all in the config shown in the diagram but all the other lights on the same loop upstairs are working fine.

 

[Spark123]

What colour wires are in the cable behind the dimmer switch?

 

[AndyBNorthWest]

I don't know actually, as I haven't removed the dimmer switch cover. Would this help to know?

 

[Spark123]

Yes

 

[AndyBNorthWest]

OK I have added a diagram of the wiring for the existing dimmer switch at the link below. Thanks for your patience on this guys, it's really appreciated.

http://www.photobox.co.uk/album/4019087

 

[ban-all-sheds]

Do both sides of that dimmer switch do something?

 

[AndyBNorthWest]

Both sides originally worked correctly - one side controlled L1 and the other L2.

Currently, as wired up in the first diagram, neither L1 or L2 are working - so neither side of the dimmer switch is working correctly.

Cable D is obviously from the dimmer switch, but I don't know how to connect cable D up to the correct terminal blocks (1-4) for L1.

 

[AndyBNorthWest]

Now been in the loft and identified the different cables.

Have changed the diagram (see below) to show how I currently have everything wired. I think I am nearly there, just need someone to advise on the remaining connections please. Thanks in advance.

http://www.photobox.co.uk/album/4019087

 

[Spark123]

The red wire from C needs to connect to the permanent live block with the other two reds. Black from D connects to the neutral block. Yellow from C connects to a spare piece of chock block to lamp 1 live only.
(or in the event of a ceiling rose, use the chock block for the connection between the blue wire and red wire for lamp no 2 and use the terminal for lamp 1)

 

[AndyBNorthWest]

Spark, worked a treat, all fine. Thanks very much for your help.