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Thread: Discovery 3 LED trailer lights

  1. #321
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    Quote Originally Posted by Tombie View Post
    You can reduce this heat by using a 25w 6.8ohm resistor instead of the 50w units.

    My next batch will be tested using these.
    Since the wattage rating of a resistor is its ability to handle the power of the circuit, using a lesser rated wattage resistor would produce more heat and would be more likely to fail.
    Having said this the 25W resistor is adequate as 6.8ohm resistor draws about 1.9A at 13 volts. P=VA 24.7watts.
    The resistor mimics a nominally 21watt turn indicator bulb

  2. #322
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    Quote Originally Posted by Grappler View Post
    Since the wattage rating of a resistor is its ability to handle the power of the circuit, using a lesser rated wattage resistor would produce more heat and would be more likely to fail.
    Having said this the 25W resistor is adequate as 6.8ohm resistor draws about 1.9A at 13 volts. P=VA 24.7watts.
    The resistor mimics a nominally 21watt turn indicator bulb
    Correct. And as the system only needs ~15w to trigger, this should be more than adequate and far more compact to build.

  3. #323
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    Quote Originally Posted by Tombie View Post
    Heck. I best get busy Discovery 3 LED trailer lights
    That would be great, thanks.
    Mine - modified MY03 LT L318 Discovery 2a HSE Td5 15P
    Hers - MY12 L319 Discovery 4 2.7L TDV6
    Dads - MY12 L319 Discovery 4 2.7L TDV6
    Sister-in-laws - MY98 LJ Discovery ES 3.9L V8

  4. #324
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    When it came to me wiring up my caravan which has 12 pin flat plug to work with the round plug of the D4, I just added one resistor to one indicator wire to the conversion lead. I read that people seem to think the resistor gets very hot. All I can say is mine is mounted to the flat plug on a "heat sink" of strip metal I found lying around. I am sure if the heat generated by this resistor gets as hot as people say on this post, then I would notice some melting of plastic. In have not. I can only assume that the resistor gets hot when its working, which is in reality only when the indicator light is activated. I would assume for it to get so hot it melted plastic it would have to be working for a considerable time, and a lot more than we usually have our indicators working. What I did notice once I attached the resistor, my car behaved quite differently in regards to gear changes, no reversing chimes etc. I was surprised as I would have thought the only time the car would know a van is attached is when the resistor doing its job.
    2016.5 TDV6 Graphite D4,Corris Grey,APT sliders,Goe air comp plate,UHF & HF radio,Airflow snorkel,Discrete Winch,Compo rims with 265/65/18 KO, LLAMs,Traxide dual battery with winch set up,EAS emergency kit,Mitch Hitch EGR blank & delete,ECU remap

  5. #325
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    Quote Originally Posted by dirvine View Post
    When it came to me wiring up my caravan which has 12 pin flat plug to work with the round plug of the D4, I just added one resistor to one indicator wire to the conversion lead. I read that people seem to think the resistor gets very hot. All I can say is mine is mounted to the flat plug on a "heat sink" of strip metal I found lying around. I am sure if the heat generated by this resistor gets as hot as people say on this post, then I would notice some melting of plastic. In have not. I can only assume that the resistor gets hot when its working, which is in reality only when the indicator light is activated. I would assume for it to get so hot it melted plastic it would have to be working for a considerable time, and a lot more than we usually have our indicators working. What I did notice once I attached the resistor, my car behaved quite differently in regards to gear changes, no reversing chimes etc. I was surprised as I would have thought the only time the car would know a van is attached is when the resistor doing its job.
    You have a D4. This thread is related to the D3 and LED trailer lights. The D4 and the D3 behave differently. The D3 is continually pulses the trailer indicator lights. So if you had done what you say you did on a D3 your trailer LED lights would flicker and your resistors would be worked even though you have not activated your indicators. Since they are continuously being pulsed they would be heating also. How hot they might get I can't say but the point being on a D3 they are not worked only when the indicator light is activated as you have assumed, they are worked all the time.

    People with D3's need to consider the difference between the D3 and the D4 with respect to the behaviour of load resistors and LED trailer lights.
    2011 D4 3.0 SDV6
    1999 D2 V8, in heaven
    1984 RRC, in hell

  6. #326
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    I recently had the left hand circuit in my Liner electronics trailer module fail, so I rebuilt a whole new one, costs less than half the price of buying a replacement.
    Shane
    2005 D3 TDV6 loaded to the brim with 4 kids!
    http://www.aulro.com/afvb/members-rides/220914-too-many-defender-write-ups-here-time-d3.html

  7. #327
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    Quote Originally Posted by shanegtr View Post
    I recently had the left hand circuit in my Liner electronics trailer module fail, so I rebuilt a whole new one, costs less than half the price of buying a replacement.
    Nice vid bloke.

    Easy to make aren’t they!

  8. #328
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    Quote Originally Posted by Meken View Post
    Unless you have some switches to disconnect the "Australian" socket the car will see the resistance and think there is a trailer attached all the time even when there isn't. This will affect car systems such as transmission changes and learning mode, stability control, off-road height (don't think you can select with trailer attached)
    Is that true that off-road height can't be selected with a trailer attached (and recognised by the car - I've bought a Narva load resistor, but not sure where to hook it in to my Stockman Pod trailer which has such nice, tucked away wiring!)?
    Now 2016 D4 HSE 'Leo' and Steve the Triumph Speed Twin
    Then 2010 D4 3.0 HSE 'James'
    Then 2010 RRS TDV8 'Roger' w traxide DBS, UHF, Cooper Zeons, Superchips remap
    Then 2010 D4 TDV6 'Jumbo' w traxide DBS
    First love 2002 D2 TD5 'Disco Stu'

  9. #329
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    Discovery 3 LED trailer lights

    Quote Originally Posted by Stuart02 View Post
    Is that true that off-road height can't be selected with a trailer attached (and recognised by the car - I've bought a Narva load resistor, but not sure where to hook it in to my Stockman Pod trailer which has such nice, tucked away wiring!)?
    No. The car won’t select offroad height automatically - so as not to throw a trailer bum down in the ground.

    You can still manually select the lift.


    You can wire it anywhere on the indicator power feed - behind the light will work if you like. Just between indicator power feed to earth
    Last edited by Tombie; 27th January 2022 at 09:24 AM.

  10. #330
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    Is there any benefit in fitting a resistor on the tail light power feed ?
    MY08 TDV6 SE D3- permagrin ooh yeah
    2004 Jayco Freedom tin tent
    1998 Triumph Daytona T595
    1974 VW Kombi bus
    1958 Holden FC special sedan

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