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Thread: How to setup the foglights so that it CAN be on with highbeams

  1. #1
    Join Date
    Dec 2006
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    Richmond, BC
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    35

    Default How to setup the foglights so that it CAN be on with highbeams

    hey guys,

    how can I hack the lighting system so that my highbeams do not kill the foglights.... Right now the highbeams will turn the foglights off.

    The reason I want to do that is that I got some yellow highbeam bulbs AND yellow fog light bulbs that I want to use together at night on a mountain pass I usually take for the sake of running on a mountain pass

    If I can have both yellow highbeams and yellow foglights on at the same time I can be invincible LOL...

    Let me know guys if anyone has done that mod.

  2. #2
    Join Date
    Dec 2003
    Location
    Austin, TX
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    1,181

    Default

    Honestly, your fogs are pretty much useless with your high beams on. It's possible, you'll need an Aussie LKM for sure...the euro LKM's might allow this, but im not sure. If anyone has one of each they could compare, this would be a neat upgrade. I posted this very question a few years ago when i had my older E34. Nobody seemed to have a valid answer or comparison back then, hopefully someone has come up with something since.
    1995 540iA M-Sport - 76k miles. 1 of 1 auto AW3 cars.
    1995 540i/6 - Misc Parts donor for above.

  3. #3
    Join Date
    Dec 2006
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    Richmond, BC
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    Default

    it was somewhat covered but that thread went to sheet when people started complaining about people who drive around clear nights with foglights on and why NHTSA doesn't like E-code headlights.

    in that thread someone did mention they "modified" their LKM to make that possible but I lost track of who that was by page 6

    anyway I live in a snow covered city north of the US border with no lights on that particular mountain pass I run (ok fine it's for fun) so I have all the reasons to turn on all 6 lights in front of the car.

    Hopefully someone can show how to "modify" a US/Canadian LKM and don't hate. I just want the fog lights with the highbeams coz that road has a lot of loose rocks and lil animals running around all the time those things just appear from UNDER the highbeam. And on snow covered roads yellow lights give a clear advantage to white light for visibility.

  4. #4
    Join Date
    Mar 2006
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    USA
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    you could bypass the LKM for the foglights and wire in a separate relay, then run it directly off the B+ junction box in the engine compartment.

    you got HIDs in the fogs?
    Alusil, Dinan DME | ITG Air Filter | Eibach/Bilstein HD | 26/20 Swaybars | Iridium plugs | Depo/ProLumen HID | Optima batt. | no AC | Stoptech brake lines, Frozen rotors, brass bushings, Superblue

  5. #5
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  6. #6
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    Default

    my euro lkm works(its a basic one)jut see my sig .The fogs will fill in the sides a little bit,its noticeable on low but on high you dont realy notice.If iwere you i would run yellows in one or the other,then you have all bases covered,yellow is actually better in fog for the same reason you state less reflection/glare back at ya
    Last edited by Paul in NZ; 01-14-2007 at 03:41 AM.
    Gone but not forgotten

  7. #7
    Join Date
    Dec 2006
    Location
    Richmond, BC
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    Default

    Quote Originally Posted by BillionPa
    you could bypass the LKM for the foglights and wire in a separate relay, then run it directly off the B+ junction box in the engine compartment.

    you got HIDs in the fogs?
    no I don't have it

    so you are saying I just splice the wire to the highbeams and power the foglights with them as well?

    Are the bimmer headlights negative triggered or positive triggered? (i.e. when the high beam is on I closed the circuit on the ground end or the positive end of the bulb?)

    coz I'd have to wire it differently depending on that.

  8. #8
    Join Date
    Feb 2004
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    4,894

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    Since LKM controls it... it is positive trigger... What you can do is solder one wire from high beam light output on high beam relay to the source for foglight relay. I would put a fuse for this circuit too just to be on safe side,

  9. #9
    Join Date
    Jan 2006
    Location
    Connecticut, USA
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    676

    Default

    Quote Originally Posted by BillionPa
    you could bypass the LKM for the foglights and wire in a separate relay, then run it directly off the B+ junction box in the engine compartment.

    you got HIDs in the fogs?
    I was just gonna say, no need to modify the LKM, just rig up another relay
    1990 Islandgrun 535iM Sedan

    3k oil changes | Euro lights + trim | Eibach/Bilstein | EAT Chip

  10. #10
    Join Date
    Aug 2005
    Location
    Iowa, USA
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    even though i have no clue why you want to so whatever you are trying to do, i will give you a very simply solution that works.

    On my 95 525, the doofus who owned it prior to me, either by mistake, or on purpose, attached the fog lights to the wire that goes to the front bumper side marker, As a consequence the fogs were always on whenever city lights or higher was selected, the fog light switch was useless, and there was a fog light display error on the OBC. I switched it back and fixed all of that.

    But if that's something you can live with, just switch the cables for front bumper side marker lights with the fog lights

    -em
    1995 525i "Stefanie"

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