Left Brake light on permanent..?

[Leigh]

This sounds like a really daft question...(but you're all probably used to those from me by now..)..

I noticed last week that my left side brake light was out, so got a spare bulb and swapped it over, then when I put the lights back on , the brake light was permanently on.
I can see on the old bulb that one of the two filaments in the bulb is obviously burnt out (it's a dual filament bulb as it's the tail light and brake light combined just in case anyone hasn't looked at one before..)

Anyone got any ideas as to why that might be happening? It's only on the left side, right hand side is behaving itself (bulb hasn't blown, and only comes on with brake pedal).
I do have a 3rd high level brake light that was already fitted by a previous owner, it is wired up to the left hand side cluster, and that is also working fine, so hopefully at the moment it's not too much of an issue in terms of Mr Plod, but that said I don't like having things not working!
Apart from the bulb holder being a bit fiddly to remove/reinstall due to some thick pipe/cabling in the way, I thought it would be a 2 minute job..!

[Monkey]

Are you sure it's not the parking light? When the ignition is off if you put the indicator left or right then the side light on that side comes on.

[ROG]

Is the bulb in the right way around, it looks like they should only go in one way but they can go in 180deg wrong even though the `pins` on the side are at different hights! ,then they light up constantly.

[Toddy]

Check the wires where the high level brake light connects, could be a short on here giving constant 12V. It might be you have disturbed something while fitting the new bulb.

[Leigh]

Weird!
just spent another 30 mins chopping and changing bulbs, holders etc trying to logically approach the problem, finally ended up getting a spare holder (got set of rear lights spare off ebay last year), swapped a holder with a bulb already in, and everythings tickety boo...
I'm not convinced the bulbs I got from Halfrauds are correct, even tho I looked them up on the chart,..
still all is well now

[ROG]

My mate with had this, he had managed to put the bulbs in the wrong way round , his bulbs were from from halfords, i dont know how, but his bulbs go in both ways.

[Leigh]

I did take heed of what you said on the previous post Rog, I wasn't being ignorant
can't see how your mate managed to get them to sit in the wrong way around tho, I tried deliberately and the bulb wouldn't 'lock' in . One way around they would push in properly and turn, the other way you can push the bulb down a little, but when you twist it the buld just pops up again and didn't make contact.
Just glad to have the lights working properly again, it was really starting to bug me!