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DRL dimmed with headlights on (How to Guide)

Discussion in 'VF Holden Commodore (2013 - 2017)' started by veessv, Mar 31, 2014.

  1. veessv

    veessv New Member

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    Hey guys finaly got around to fitting a dimmer relay, after a few ups and downs she working.
    I bought ones of these dimmer relay off ebay

    Now I had a few problems when wiring up the white wire that is designed to dim the DRL was connected to parker it caused the DRL's to flicker so I had to connect up a 4 pin or 5 pin relay what ever you have handy.

    The next problem came the next day when I had thought everything was working great I notcied the DRL werent working what I forgot to realise is that the dimmer relay is voltage sensing meaning it will turn on or off when the voltage raised or droped below 13v.
    Now coz the VF's alternator switches off when not needed meant it also droped below 13v and the DRL's turned off so to fix that I connected the orignal DRL wiring to the BLUE AND YELLOW wire from the Dimmer Relay designed to be used for indicators to the 12v+ from the factory wire that went into the DRL and that fixed it.

    But in doing all this I have now worked it all out and I hope I have made the diagram easy enough that anyone can do it. If I could find the plugs that the DRL's have I could make up a loom for people but for now you will have to follow the diagram

    Things you will need is the ebay dimmer relay, a relay and some extra wire for the relay
     

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    Last edited: Apr 3, 2014
  2. Flukey

    Flukey New Member

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    Pretty cool.
     
  3. Tasmaniak

    Tasmaniak Not a valid input....

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    Fwiw... you can buy relays with diodes across the coil inbuilt... or a resistor!
     
  4. lacks creativity

    lacks creativity New Member

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    I like it! nice work & thank you for sharing.
     
  5. veessv

    veessv New Member

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    Yes your right you can buy relays with a diode in it but all that does stop kickback or back emf through the circut you have tap into, the resistor also helps with voltage spikes so not sure how that applies as I only used a relay to get rid of the flickering when dimmed.

    If you were to use resistors to drop the voltage to dim the DRL you would need a few in series on how many I dont know until you would think it has enough dim also I would also worry about the heat it dissipates. What you really need is a voltage regulator, and is probably what is in this ebay kit or it could be a chip circut as it also has the ability to be used as flashing turn signals and in all honesty for 10 bucks i went the easy way and got the kit. You can get a voltage reg to drop the voltage with lights on and do it that way but you still will need to put a diode on the factory 12v input to the DRL or risk it and see what happens and you might still get the flickering so you will need another relay as the flikering only happened when it was connected to the parker and didnt happen when connected straight to 12v hence why the relay
     
  6. rhino6.0

    rhino6.0 New Member

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    Stupid question time...Why would you want to do this? It's very clever I just don't get it.
     
  7. Tasmaniak

    Tasmaniak Not a valid input....

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    Sorry mate, I was under the impression the diode was to protect the bcm from when the relay coil breaks down
     
  8. kyled2012

    kyled2012 I.T. Technician

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    The Gen-F HSV's do this, and so do most euro's with DRLS. I like the look, and it increases night time visibility without being blinding.
    In my opinion, it's mostly a personal taste modification.
     
  9. Benboy

    Benboy Well-Known Member

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    What do the ADR's (Australian Design Rules) have to say about running DRLs (Daylight Running Lights) during hours of darkness ?

    I was under the impression that when the headlights were turned on vehicles with factory DRLs, the DRLs were extinguished.

    I do know that it is illegal to drive at night on a road in a Municipality or built up area with more than two lights showing to the front.

    For example, you cannot drive in those areas at night with high beam on.

    You cannot drive at anytime with headlights and fog lights on at the same time (4 lights). M'mmm seems to me you could have some roadworthiness issues !!
     
    wombat tow likes this.
  10. B-Man

    B-Man Member

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    if all you wanted to do was run the DRL when the headlights were on could you not of just run a diode from the parklights to the DRL relay pin #85?
     
  11. veessv

    veessv New Member

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    I wanted it to run at half brightness You could just wire it up from the headlight but it would be bright
    ADR states that the DRL's need to dim when headlights are on and that you can't have more then one set of parking lights so if the DRL's dim then you need to take out your parkers as they are now your park lights just like the HSV's
     
  12. B-Man

    B-Man Member

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    ah ok makes sense
     
  13. Flukey

    Flukey New Member

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    I like it.
    veessv, you seem like you are pretty good with electronics. What is involved in getting the LHS mirror to dip on reverse?
     
  14. kyled2012

    kyled2012 I.T. Technician

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    The fact that most euro's and all Gen-F HSV's only dim the DRL's when headlights come on makes it reasonably believable that this will be fine. Also sounds like the laws you are quoting are more specific to Fog lights and Spotties, rather than DRL. I would bet that Euro's driving through SA at night would not get defected for the factory DRL's being on at night.
     
  15. veessv

    veessv New Member

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    Ill have to have a look into it I know some people have done it on the VE as the calais has it but it was connected to the memory seats module so I think they used the whole setup. almost need a timer for when it was switched into reverse the mirror went down for a few secs then when out back up for a few secs hmmm
     
  16. 426Cuda

    426Cuda SUBLIME!

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    Any luck with the mirror dipping in reverse?
     
  17. 426Cuda

    426Cuda SUBLIME!

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    Veessv,

    This is a very cool mod IMO. I've just purchased the DRL dimmer relay harness. I'm handy enough with auto electrics but will be getting someone who knows what they're doing to set this up for me. Any chance of posting up some pics of the install? I want to ensure the wiring is all concealed properly and located in the best place.

    Have you had any issues with this since your last post?

    Cheers and thanks for your pioneering efforts :spot on:
     
  18. profat

    profat Member

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    to answer BEN BOYS query earlier regarding running DRL and head lights at once and to clear up any and all confusion

    The third edition ADRs only allow white daytime running lights.

    (5) Daytime running lights must be wired so they are off when a headlight, except a headlight being used as a flashing signal, is on.
     
  19. 426Cuda

    426Cuda SUBLIME!

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    I must be missing something then? How is it that many euro's and our HSV's have DRL's and headlights on together?
     
  20. Zeussy

    Zeussy SSM11K

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    Think those rules must be out of date, or have more to them?

    Factory Gen-F Clubsport has DRL, which stay on when headlights are activated. Hard to believe a brand new car would be made so it doesn't comply with current ADR's.
     

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