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Thread: Retro fit Daytime Running Light Wiring

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    Default Retro fit Daytime Running Light Wiring

    Hi, a while ago I started seeing these DRL thingys on other cars and thought that it was a good idea of showing other road users that my vehicle is operational (apart from the fact that it is usually moving ) aka motorcycle users. I carried out some research on DRL's and found out that under the European Directive 76/656/EEC, as ammended by 2008/89/EC, all new type approved passenger vehicles after February 7th 2011, should have some sort of DRL.

    I then purchased some DRL's complete with a relay, fuse, etc. I removed the front bumper, cut out the top part of the fog light blanks and fitted them to the bumper. Having threaded the necessary wiring up to the area of the battery compartment I refitted the bumper. Standing back, I looked at the job so far and in my opinon I thought that they looked smart.

    So on to the wiring. I studied the wiring diagrams and fitted the relay, fuse, etc as directed. So with the job complete, it was time to do some testing. With the key out of the ignition, no lights, so that was a good start. Turned on the engine, still no lights, hang on I thought, are they meant to be on now? Turned on the sidelights and the DRL's came on. Don't get me wrong, the DRL's looked smart!

    But, what's the point in having the sidelights on aswell as the DRL's? Just would be cheaper to use the sidelights with no DRL's! So I checked the wiring and everything was ok. The relay was powered by the sidelights circuit (as I was wiring I thought this seemed a bit odd). Solution, do away with the sidelight circuit and use a live feed that is powered by once the key is turned in the ignition, so I used the live for the cigarette lighter. I thought well if the original setup was allowing the DRL's to be on whenever the sidelights are on, then it should be ok for them to be on at night aswell as daytime use.

    The next thing I'm going to say is something experienced by many modifiers (if I can add myself to that group?). A few months go by and all is well until....... I am driving behind a van with a pair of West Yorkshire's finest down an uneven road at night. They pulled over and I legally overtaken them, before they immediately started following me. Approximately 1/2 mile later they flash their lights. After going through the usual, they ask me about my 'fog lights' that were 'dazzling' him. I calmly and politely explained that they were not fog lights and that they were DRL's to match the legal requirements of all new passenger vehicles and that they were boxed as DRL's and fitted as per the instructions blah di, blah di, blah! They one by asking me to turn them off, so I removed the fuse there and then and they were more than happy to let me on my way.

    So that got me thinking

    I want my DRL's to come on as soon as I turn on my ignition. The DRL's I see through the day are not bright nevermind dazzling, but through the night I could see their point. So, as soon as I turn on my sidelights, I want my DRL's to turn off. My solution was to fit a relay with the DRL's accross the common and normally closed contacts, and the sidelight circuit accross the actuator side of the relay. This would break the circuit for the DRL's once the sidelights are on.

    Job done, I think lol,

    How does that sound?

  2. #2
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    sounds like a good plan mate..
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    All sounds good

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    The police were right - DRLs are supposed to automatically switch off when sidelights or dipped beam are switched on, so you would not expect to see DRLs at night, unless the driver has forgotten to switch his lights on.

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    thats how they are supposed to be wired up isn't it on with ignition off with the sidelights to be legal .

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    ya beat me to it

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    well you wired it wrong ...

    as 1 should be ignition live, 1 should be to sidelight/parking light, 1 should be ground.

    and the DRL should be to the last pin of the relay, and ground.

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    Quote Originally Posted by Rebellion View Post
    The police were right - DRLs are supposed to automatically switch off when sidelights or dipped beam are switched on, so you would not expect to see DRLs at night, unless the driver has forgotten to switch his lights on.
    Thats how I expected them to work to be fair.

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    Quote Originally Posted by kenp View Post
    well you wired it wrong ...

    as 1 should be ignition live, 1 should be to sidelight/parking light, 1 should be ground.

    and the DRL should be to the last pin of the relay, and ground.
    The original relay was wired up correctly and there was no other way to wire it up and work. Trust me, I work on central heating controls that make good use of relays, so I know how they work. The first relay closed the DRL circuit when the sidelights were operated instead of opening (breaking) the circuit.

    I used a 12VDC octal relay, maybe overkill, but I use them at work so I have trust in them.

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    Quote Originally Posted by plasma View Post
    sounds like a good plan mate..
    Quote Originally Posted by Rob12 View Post
    All sounds good
    Thanks fellas!

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