Manny Posted February 3, 2015 Share Posted February 3, 2015 Hi why won't a LED bulb work in the third brake light . The one that sits on parcel shelf. The bulb works fine. Tried a normal bulb the connection if fine. ?? Quote Link to post Share on other sites
FrozenJakalope Posted February 3, 2015 Share Posted February 3, 2015 Have you tried rotating the bulb 180 and reinserting? Quote Link to post Share on other sites
Manny Posted February 3, 2015 Author Share Posted February 3, 2015 Have you tried rotating the bulb 180 and reinserting?Yes I have. Quote Link to post Share on other sites
Manny Posted February 5, 2015 Author Share Posted February 5, 2015 Any ideas?. I've tried a few different LED bulbs but still don't work. Quote Link to post Share on other sites
FMuscle Posted February 5, 2015 Share Posted February 5, 2015 LEDs don't work either side they're on, but normal globes do? This is a serious case of WTF... Did you try the LEDs somewhere else, front light or...? Quote Link to post Share on other sites
Manny Posted February 5, 2015 Author Share Posted February 5, 2015 LEDs don't work either side they're on, but normal globes do? This is a serious case of WTF... Did you try the LEDs somewhere else, front light or...?No the led bulb works for the reverse light or fog. I'm trying to have a led bulb to work in the rear parcel shelf brake light but won't work. A normal bulb works fine. Quote Link to post Share on other sites
FMuscle Posted February 6, 2015 Share Posted February 6, 2015 (edited) Honestly don't know what to suggest next... I'm stumped. It doesn't makes any sense to me, and I'm pretty much eat-sleep electrics... *Edit: Unless, just got a flash, your 3rd brake light is reverse polarity? The bulb is like this one?Check the socket, one wire going to the middle of the socket should be the +. It'd be a green/red wire, red I think, and the wire on the outside should be the earth, white/black stripe, for it to work properly.If the white/black is in the middle try inverting the wires. Edited February 6, 2015 by FMuscle Quote Link to post Share on other sites
FrozenJakalope Posted February 6, 2015 Share Posted February 6, 2015 (edited) Assuming the parcel shelf lights are the same in all UK models, the back of the socket looks like thisI really can't think of anything else either. Might be worth getting a multimeter on there to see what the voltage coming through it is. If there's a dodgy connection somewhere around there, might leech off a few volts and take it below the critical voltage for the LED. I'd be surprised, because you'd probably need to lose a significant amount of power for that, so the globe would be really dim, but still might be worth a look. Edited February 6, 2015 by FrozenJakalope Quote Link to post Share on other sites
FMuscle Posted February 6, 2015 Share Posted February 6, 2015 That green/red is the power, it could be just a matter of swapping the wires. the engineers may not have thought that people woult convert to LEDs 20 or so years later and didn't worry about the polarity... Quote Link to post Share on other sites
FrozenJakalope Posted February 6, 2015 Share Posted February 6, 2015 Wouldn't spinning the bulb 180 have the same effect? Quote Link to post Share on other sites
FMuscle Posted February 6, 2015 Share Posted February 6, 2015 Not with those bulbs, positive is at the bottom, and earth is the metallic body. Any of the 360° around would give the same result. Quote Link to post Share on other sites
FrozenJakalope Posted February 6, 2015 Share Posted February 6, 2015 (edited) Ahhhh, I gotcha. Sorry, wasn't following. Ive just been out and checked and you're right on the type of bulb, so that should do it. Edited February 6, 2015 by FrozenJakalope Quote Link to post Share on other sites
Manny Posted February 6, 2015 Author Share Posted February 6, 2015 (edited) That green/red is the power, it could be just a matter of swapping the wires. the engineers may not have thought that people woult convert to LEDs 20 or so years later and didn't worry about the polarity...I have zero IQ in electronics.Thanks a lot f muscle. Yeah swapping the wires yes it works. Yeeeha.Hope this helps others. Thanks all. Edited February 6, 2015 by Manny Quote Link to post Share on other sites
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