Tomyspeedy Posted November 30, 2015 Share Posted November 30, 2015 So i've recently changed the rear lights for led bulbs. They all worked correclty before doing so and they all work correctly now...great you might be thinking... well I've also got a rear light failure light on the dash that comes on as soon as you turn the headlights/sidelights on. It also illuminated the brake warning light aswell ((!)) So I took a hint and changed the rear brake light bulbs back to filaments, which sorted the dash lights. My question now is, what do I need to change to prevent the rear bulb warning light illuminating if i want to run led bulbs? Which component could I change to detect a failure in the led light? I'm presuming that it's a simple lowering of resistance in the brake circuit that's throwing the problem, I just don't have enough knowledge of the system to know what I could do to fix it! Quote Link to comment Share on other sites More sharing options...
Swampy442 Posted November 30, 2015 Share Posted November 30, 2015 LEDs have a much lower resistance than normal bulbs, thats why you get the warning, either solder som eresistors of the correct value inline, or delete the warning circuit. Or take the bulb out lol. Quote Link to comment Share on other sites More sharing options...
mattdavies Posted November 30, 2015 Share Posted November 30, 2015 I had LED rear lights and Bulbs, I resolved this issue by taking the warning lamp bulb out Quote Link to comment Share on other sites More sharing options...
Tomyspeedy Posted November 30, 2015 Author Share Posted November 30, 2015 I really don't want to alter the circuit in a permanent way. I was hoping that there would be a component I could change.. In the indicator circuit you just have to change the flasher relay.. And in the similar thought process I was hoping a component in the warning system could be swapped? Also... Why wouldn't the led bulbs have the resistors inside as a self contained unit? Quote Link to comment Share on other sites More sharing options...
Chris Wilson Posted November 30, 2015 Share Posted November 30, 2015 LEDs have a much lower resistance than normal bulbs, thats why you get the warning, either solder som eresistors of the correct value inline, or delete the warning circuit. Or take the bulb out lol. Hmm, higher resistance, not lower, the warning module sees not enough current draw and flags the warning. Google this, OP, and I think you may find some stuff there. I would guess it would involve a parallel resistor across the LED. Here's a quick Google find for you: https://sites.google.com/site/1810martin/led-bulbs-and-lights Quote Link to comment Share on other sites More sharing options...
Swampy442 Posted November 30, 2015 Share Posted November 30, 2015 I had to google that, sorry for the bad info, I was sure it was lower. Quote Link to comment Share on other sites More sharing options...
Tomyspeedy Posted December 1, 2015 Author Share Posted December 1, 2015 Thanks Chris, pushed me exaclty in the right direction. Doesn't seem to be worth swapping bulbs because the current draw would have to be the same, unless I modified the warning module which I don't really want to do with my knowledge set. Quote Link to comment Share on other sites More sharing options...
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