Outdoor floodlight Grey wire query

[Milanu]

I bought an outdoor floodlight to replace a faulty one. Once I removed cover I can see old light has 4 wires, Red, Black Green/Yellow and Grey. New light is only 3 wires Brown, Blue and Yellow.

So I’m thinking Red to Brown, Green/ Yellow to Yellow, Black to Blue. The Grey wire is the one throwing me. Can I wire up the rest and leave grey out, wire grey into somewhere else, neutral maybe? or am I destined to find a four wire replacement instead.

There is one switch that operates this light, but it is a two switches fitting, the other switch being for an inside light that can also be switched on/off elsewhere in the kitchen. Pics attached. Advice appreciated.

 

[telectrix]

did the old light have a PIR attached?

 

[Milanu]

did the old light have a PIR attached?

No PIR

 

[Dustydazzler]

Normally you have a perm supply and a switch supply when I see 4 cores

 

[snowhead]

Does the Brown /Black /Grey /Earth cable appear at the switch, the answer may be there?

 

[Lucien Nunes]

So I’m thinking Red to Brown, Green/ Yellow to Yellow, Black to Blue

Don't guess! The neutral ought to be the grey, and either brown or black a redundant PL. Do you still have the old light? Can you see inside it?

 

[Milanu]

Don't guess! The neutral ought to be the grey, and either brown or black a redundant PL. Do you still have the old light? Can you see inside it?

I do still have the old light up

Don't guess! The neutral ought to be the grey, and either brown or black a redundant PL. Do you still have the old light? Can you see inside it?

Old light is still out there. I left all well alone when i realised it was not going to be a simple job. I will take the old one down and take a look inside if poss and get back to you. Thx.

 

[telectrix]

I do still have the old light up

Old light is still out there. I left all well alone when i realised it was not going to be a simple job. I will take the old one down and take a look inside if poss and get back to you. Thx.

take a pic of how it's connected before you diss. it.

 

[Milanu]

Old light down and taken to bits. Inside all became obvious. The brown wire was indeed redundant. Problem solved. New light up and working. Cheers. I would not of thought of looking inside the light itself, just assumed as all wired up so must be doing something. Merry Xmas ?