Installing a new ceiling light

[SteveEX8]

Hi.
I'm trying to install a new ceiling light.

My hallway is quite long with one light switched from both ends of the hall (2-way).
Can anyone help with understanding the wires?
I have a T&E plus a switched live running between the two switches. I have wired the T&E into a juntion box and run a new T&E to the light fitting. I haven't touched the switched live.
When I replace the fuse the old light comes on but the new one doesn't. When I switch off at the switch the light dims slightly.
What have I done wrong?

 

[SteveEX8]

I've now connected the switched-live to the live to the new light but still no uk.

Can anyone help?

 

[PrenticeBoyofDerry]

Is it a loop in light with ceiling rose.
If so you will have 4 terminal points.
1 port for earth
2 ports for switch live
3 ports for live loop
3 ports for neutral
Like this

Untitled

• PrenticeBoyofDerry
• 27 Sep 2011
• 3

New colours are
Live=red=brown
Neutral=black=blue
Earth=green/yellow=green yellow

So from the ceiling rose to you additional light
you connect the twin and earth across them like this:
I assume we have new coloured cable.
The brown core to the terminal that the switch live is indicated (brown flex of fitting)
The blue core to the neutral terminal (blue flex of fitting)
and your cpc/earth to the earth terminal.
These then are terminated the same at the additional light.
Brown to switch live/brown flex of fitting
Blue to neutral/blue flex of fitting
CPC/Earth to earth terminal.
Leaving the loop live empty.
or sometimes there is a spare on the fitting for the loop!
If you don't have a ceiling rose the same principals can be used.
A picture of what you have might help.