Aftermarket DRLs on a diesel engined car
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Thread: Aftermarket DRLs on a diesel engined car

  1. #1
    Fellow Frogger! 505604's Avatar
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    Icon8 Aftermarket DRLs on a diesel engined car

    Hi, wise, electronically minded people!

    I'm wanting to fit DRLs to my cars. I can easily mount the lights, but when I have talked to auto electricians, no less than 3 have shied away.

    "It's too hard.", is the complaint.

    All of them have said that the modules that can be purchased off eBay etc won't work properly with a diesel engine, and trying to wire up the lights to come on when the engine starts and then go off when the engine stops is too difficult and/or time-consuming. I couldn't afford their bill (without them telling me how much it would cost).

    So, what's so difficult about it? Why wouldn't the ready-made modules work with a diesel engine?

    Thanks in advance,
    Andrew

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  2. #2
    1000+ Posts dmccurtayne's Avatar
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    Default Aftermarket DRLs on a diesel engined car

    What sort of car I donít really get what they are avoiding you can just turn lights on always in the bsi
    Unless they are avoiding PWM systems that pulse the lighting power when the engine is running to regulate voltage from 308 / c4 on

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    I am looking at doing similar, but have petrol engine.

    Whats' wrong with KOLO (Key on, lights on)?

    Simple relay turning on separate DRL's (presumably LEDs) with Ignition ON. I have heard that people have them turn OFF when headlights are turned on, which also doesn't sound too hard to arrange through the relay (or a separate relay), but why not leave them on?

    I have read (unconfirmed) they need to be less than 1200 candela to avoid being foglights or driving lights. Proper DRL lights should comply, I see Hella, Narva and Philips do them.

    May be other legal issues.

    I had them in my ex-Telstra BA Falcon wagon, they were using the low beam headlights, with a special module integrated into the headlight system. I found my headlight globes didn't last too long, even with Long Life globes, and when the module failed, I disconnected it. I would now use separate LED DRLs in the Territory.

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    COL
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    I have installed DRL's on my 2002 Renault Laguna. My car is a petrol engine, but I can't see it being to hard for a diesel.

    I hooked the lights up to the fuel pump relay and also through a NC relay which is turned off when the low beam lights come on.

    Here is a link from Hella about DRL's

    https://www.hella.com/techworld/au/T...g-lights-740/#
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    Quote Originally Posted by dmccurtayne View Post
    What sort of car I don’t really get what they are avoiding you can just turn lights on always in the bsi
    Unless they are avoiding PWM systems that pulse the lighting power when the engine is running to regulate voltage from 308 / c4 on
    I haven’t even started talking to any of them about the 307!

    They’re complaining about the 406, and that’s got virtually no electronics by comparison.

    What’s the PWM?

    I did get some information once from an auto electrician who was working for a Peugeot dealer in England about the 307 and DRLs.

    A very small number of 307s in the UK had "dim-dip" headlights, but following objections from the UK vehicle approval authority Peugeot had to drop that feature.

    Subsequently they introduced a form of day running lights which were controlled by the cars electronic control unit and the rain sensor mounted near the rear view mirror. There are no physically different light units to achieve this, it is all done by programming the control unit.
    But no dealer I’ve spoken to in Australia knows about this and neither do they want to find out about it and turn them on for me. They cite the rules about not using fog lights during normal weather driving as their reason.
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    Quote Originally Posted by Fordman View Post
    but why not leave them on?
    Not legal in NSW, unless they came from the factory like that!

    Seriously, there are rules which are okay for cars from the factory, but if you have these things fitted aftermarket, they are illegal. Certain darkness of window tinting is just one of those things.
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    Quote Originally Posted by 505604 View Post



    But no dealer I’ve spoken to in Australia knows about this and neither do they want to find out about it and turn them on for me. They cite the rules about not using fog lights during normal weather driving as their reason.

    The question has being answered by dmccurtayne in post #2 , long term Psa sevice tech . Just hook them up to the BSI .
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    What’s the PWM?
    Pulse width modulation for regulation. See, eg, https://en.wikipedia.org/wiki/Pulse-width_modulation

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    Quote Originally Posted by Rally View Post
    The question has being answered by dmccurtayne in post #2 , long term Psa sevice tech . Just hook them up to the BSI .
    Oops.

    I should not have been posting last night. I knew that I wasn’t fully awake. I had meant to ask Dave for more information about that when I quoted it. But I think that you have partly answered my question.

    But I’m still not sure what the PWM is.
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  10. #10
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    Default Aftermarket DRLs on a diesel engined car

    Pulse width modulation basically switches the power to a load to maintain a certain voltage an easy way to see if a car has this is the headlight will have battery voltage when engine not running then when the engine starts the voltage can drop to 12.5 odd volts . So on and off multiple times a second so what happens is if you attach a module / relay to control led /hid lights the relay can fail early or not turn on at all due to the uneven power supply.


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    Last edited by dmccurtayne; 29th October 2019 at 09:00 AM.
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  11. #11
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    Personally, I think Col's suggestion is the way to go.
    Or just drive with your headlights on all the time. That's what I've been doing for my entire driving career. If visibility is the objective, then your headlights are better than DRLs. Especially when driving on highways out near Junee. Plus you will never end up driving around with no headlights on at night, as I see so many doing.

    Andy

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    Fellow Frogger! 505604's Avatar
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    Quote Originally Posted by 1972Ren View Post
    Personally, I think Col's suggestion is the way to go.
    Or just drive with your headlights on all the time. That's what I've been doing for my entire driving career. If visibility is the objective, then your headlights are better than DRLs. Especially when driving on highways out near Junee. Plus you will never end up driving around with no headlights on at night, as I see so many doing.

    Andy
    Thanks for your thoughts, Andy.

    I don’t know what to think about your suggestion about driving all the time with low beam headlights. Did you (or did anyone) read the Hella link about the comparison between low beam lights and DRLs?

    They make the case against low beam lights quoting increased fuel consumption figures. Yes, I was surprised, not that it would cause an increase, but the amount of that increase.

    What is it about the Junee area that you think will be a better fit for headlights rather than DRLs?

    Andrew
    Current cars: Peugeot 307 HDi Touring; Peugeot 306 Cabriolet; Peugeot 406 HDi, Peugeot 505 Familiale
    Previous cars: 1965 Peugeot 404; 1972 Renault 16TS; 1970 Peugeo 504 1800; 1978 Peugeot 504 GL; 1976 Peugeot 504 LTI; 1984 Peugeot 505 Familiale; 1982 Peugeot 604 (converted to TD) 1999 Peugeot 306 Cabriolet

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