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Wiring of 12N plug for trailer lights

  • 26-02-2013 2:49pm
    #1
    RazDaz
    Registered Users, Registered Users 2 Posts: 3 ✭


    Hi
    I'm looking for some help please!

    I've tried to wire new LED lights to my car trailer. I've replaced everything - wiring, lighting units, 12N plug, the lot! Everything working OK, except for indicators! The trouble is only when the tail lights, brake lights and indicators are on at same time! The left/right indicators start to blink faster than normal, as if a bulb is blown!! When tail lights are switched off, the problem disappears! Similarly, when tail lights and indicators are on, there's no problem. :confused:
    I should also mention that when towing at night (ie tail lights on) my car gives me an error message every time I hit the brake pedal - "Indicator lamp(s) faulty". I drive a Peugeot 407.

    Can anyone shed some light on this for me please?? (no pun intended!) I suspect it is to do with the earthing, but I'm not sure.

    Thanks in advance.


Comments

  • #2
    Chiorino
    Registered Users, Registered Users 2 Posts: 622 ✭✭✭Chiorino


    RazDaz wrote: »
    Hi
    I'm looking for some help please!

    I've tried to wire new LED lights to my car trailer. I've replaced everything - wiring, lighting units, 12N plug, the lot! Everything working OK, except for indicators! The trouble is only when the tail lights, brake lights and indicators are on at same time! The left/right indicators start to blink faster than normal, as if a bulb is blown!! When tail lights are switched off, the problem disappears! Similarly, when tail lights and indicators are on, there's no problem. :confused:
    I should also mention that when towing at night (ie tail lights on) my car gives me an error message every time I hit the brake pedal - "Indicator lamp(s) faulty". I drive a Peugeot 407.

    Can anyone shed some light on this for me please?? (no pun intended!) I suspect it is to do with the earthing, but I'm not sure.

    Thanks in advance.

    Sounds like the problem lies with the towing vehicle electrics. Was a bypass relay fitted when the towbar was fitted and wired?


  • #3
    galwaytt
    Registered Users, Registered Users 2 Posts: 12,822 ✭✭✭✭galwaytt


    If you're confident the trailer is wired right, have you tried plugging into another cars' towbar electric socket, and see if the problem manifests itself then, too ? If so, trailer is at fault - if not, could be issue with the car's socket wiring.

    Bear in mind, switching to LED light units can cause issues sometimes, due to the very low capacitance of LED's. I have heard of people leaving in one std bulb, hidden & wired, to avoid flasher units going nuts wrt LED units.

    Ode To The Motorist

    “And my existence, while grotesque and incomprehensible to you, generates funds to the exchequer. You don't want to acknowledge that as truth because, deep down in places you don't talk about at the Green Party, you want me on that road, you need me on that road. We use words like freedom, enjoyment, sport and community. We use these words as the backbone of a life spent instilling those values in our families and loved ones. You use them as a punch line. I have neither the time nor the inclination to explain myself to a man who rises and sleeps under the tax revenue and the very freedom to spend it that I provide, and then questions the manner in which I provide it. I would rather you just said "thank you" and went on your way. Otherwise I suggest you pick up a bus pass and get the ********* ********* off the road” 



  • #4
    Cmar-Ireland
    Registered Users, Registered Users 2 Posts: 2,340 ✭✭✭Cmar-Ireland


    This should sort it out.


  • #5
    RazDaz
    Registered Users, Registered Users 2 Posts: 3 ✭RazDaz


    Cmar-Ireland wrote: »
    This should sort it out.

    Thanks a mill for all your help.

    So I connected the trailer to another car - it worked perfect!
    Also connected my car to another trailer with LED lights and all the lights were flickering! Problem is obviously with may car so!

    Now, forgive my ignorance here. I'm at the limit if my capability on this - but what does that transistor thing do, and how/where should it be installed???

    Thanks again folks!


  • #6
    galwaytt
    Registered Users, Registered Users 2 Posts: 12,822 ✭✭✭✭galwaytt


    RazDaz wrote: »
    Thanks a mill for all your help.

    So I connected the trailer to another car - it worked perfect!
    Also connected my car to another trailer with LED lights and all the lights were flickering! Problem is obviously with may car so!

    Now, forgive my ignorance here. I'm at the limit if my capability on this - but what does that transistor thing do, and how/where should it be installed???

    Thanks again folks!

    Yay :D

    You don't need the transistor if it works on other cars I'd imagine.

    I'd say there's just a fundamental problem with the socket on the car. Damaged or incorrect wiring is where I'd start.

    Ode To The Motorist

    “And my existence, while grotesque and incomprehensible to you, generates funds to the exchequer. You don't want to acknowledge that as truth because, deep down in places you don't talk about at the Green Party, you want me on that road, you need me on that road. We use words like freedom, enjoyment, sport and community. We use these words as the backbone of a life spent instilling those values in our families and loved ones. You use them as a punch line. I have neither the time nor the inclination to explain myself to a man who rises and sleeps under the tax revenue and the very freedom to spend it that I provide, and then questions the manner in which I provide it. I would rather you just said "thank you" and went on your way. Otherwise I suggest you pick up a bus pass and get the ********* ********* off the road” 



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  • #7
    dougie-lampkin
    Closed Accounts Posts: 677 ✭✭✭dougie-lampkin


    Do you have the socket wired through a bypass relay or just spliced into the tail lights? A 407 really needs the relays to avoid issues like this. You risk doing damage to your BSI otherwise. Any half-modern car with bulb out warnings must have relays fitted, or else go to the dealer to have the factory 12N harness fitted if it was available.

    You don't need to spend a fortune on a kit either like some sellers suggest, I made a relay kit for my last car by using 4 standard automotive relays. The only thing it needed was a permanent live brought back from the front. Cost me €8 I think and about 20 mins to fit.

    The resistor posted above won't help you, that's used for adding load onto a flasher relay if you replace your indicators with LED bulbs to stop the rapid flashing of a bulb out.


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