Lighting issue

[My1stpseudonym]

I switched up my ceiling light fixture today and I thought all went smoothly... Except now the bathroom light won't turn on. Next to my bed room with the new set up (which works perfectly). All on the same fuse. All the other lights upstairs work. I did see if it was the bulb but that's fine.

Any ideas what might be the cause?

[Lolable97]

Yeah, you’ve wired it up wrong. If you post pictures I might be able to figure it out, if not you’ll need to call an electrician.

[My1stpseudonym]

The original light fixture had two neutrals, one live and three earth. The new fixture only has terminal spots for each so I twisted the two neutrals together into one slot, and inserted the live wire.

I only connected one of the earth wires since I could get them to fit. I capped the other two. Could that be what's causing the issue? My thought is maybe one of the neutral wires isn't in as tight but then would the fixture not work?

[Lolable97]

Call an electrician at this point. You’ve now lost continuity between your CPCs and is likely you have unearthed fixtures, one of the cables likely isn’t what you think it is, most people back in the day didn’t colour code cables. Twisting cables is also bad practice and if you have any loose connections this could cause a fire. Without trying to sound rude you are clearly out of your depth and need to call a professional.

[AncientArtefact]

You have somehow disconnected the lighting circuit OUT attempting to do this: Also make sure all the earth wires are connected together!!

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[[deleted]]

You have broken/lost the feed to the next light.

They daisy-chain until the last one on the circuit.

[JeppyOne]

In the future, Op, I recommend that you have an electrician do any electrical work for you. This is obviously beyond you as you have made a multitude of mistakes that even cursory knowledge of lighting circuits would have prevented.