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  • Funky tail light behavior

    Howdi All,

    Similar to other recent post on tail lights not working I've got some funky activity happening with my tail lights that someone may be able to shed some light on (pardon the pun).

    I have LED's in the back of the Prado for the brake/tail lights. Have had comments from a few people on trips that it is pretty hard to work out the difference between brake and tail if i have the lights on. (if the lights are off then on/off is easy to spot, if the lights are on then the difference between stop and tail is very marginal, the bar light at the top of the windscreen works fine.)

    so i decided to take them out and put some normal 5w 12v dual filament lights in. here my problems begin.

    with the new light bulbs installed i have no brake lights at all. no bar up the top, if the lights are on then no change between bakes on and off, if the lights are off then no illumination at all. and the kicker? the horn stops working properly. i get a marginal squeak (i have air twin air horns from a Calais so it's far from normal)

    had me perplexed, checked all the fuses and all is well. so normal process of elimination is to go back to where it was working, take out the light bulbs, put the LED's back in and hey presto, horn works again, as does the light bar at the top of the window and i'm back to having little difference between brakes on and off if the lights are on. tried each light independently, the moment the non led bulbs are installed the brake lights completely fail and the horn stops.

    On reflection I can't remember if the bulbs should be single or dual filament but would be surprised if that would cause the whole system to shut down including the horn? any suggestions? or can someone confirm what the bulbs should be?

  • #2
    Re: Funky tail light behavior

    Sounds to me like you have a bad earth there. You need to trace the earth back from the taillights and I'm guessing the horn shares the same earth. Do you have the factory manual? The increased load from the incandescent globes is causing the bad connection to fail whereas the minimal current load from the led's doesn't. IMO

    WRT to the brake and taillamps being hard to recognise if they are working, check they are wired correctly. Sounds like the brakelights are coming on with the parking lights.

    Or you could take it to an auto lecky..

    Ades
    Silver '04 KZJ120~Manual~GXL~Dobinson/Kings lift~Custom valved Ironmans~Detroit Locker~Endless Air~X9 Superwinch~Madman EMS1~TJM Dual Battery~Rhino Roof Tray~120W solar panel~Foxwing awning~Bushskinz UVP~Long Ranger water tank~Bushman fridge~Steinbauer P-Box~Beaudesert 2 3/4"~Airtec Snorkel~TJM Sliders~Prico Boost Gauge~BFG-KO2s~TPMS~GME TX3420~Front and Rear Cameras~Ultimate Camper hanging off the back!

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    • #3
      Originally posted by adrian5800 View Post
      Sounds to me like you have a bad earth there. You need to trace the earth back from the tail lights and I'm guessing the horn shares the same earth. Do you have the factory manual? The increased load from the incandescent globes is causing the bad connection to fail whereas the minimal current load from the led's doesn't. IMO

      WRT to the brake and taillamps being hard to recognise if they are working, check they are wired correctly. Sounds like the brakelights are coming on with the parking lights.

      Or you could take it to an auto lecky..

      Ades
      I know im late with this but I agree on you. It's the wiring thing as what had happened to me with the tail light bulbs not recognized but i have an idea that the fuses might also be considered.

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