Thread: Fog lights coming on when i step on the brakes?

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  1. #1 Fog lights coming on when i step on the brakes? 
    SE Level Member KadenGT's Avatar
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    i have after market Fog lights connected into my stock harness using a quick connect which has a plastic tubing over it and thats sealed shut with electrical tape. and i recent installed LED bulbs into my taillights which i do have the rear side marker as an LED also, it has the sequential tail light mod listed on here. but whenever i step on my brakes my fogs come on not every time only when i first start braking then my digital climate control goes blank and the gear indicator in the gauge cluster dims also then i let off the brakes and it goes back to normal but then the digital climate control also flickers when i use my turn signals and it only started this when i put in the LEDs for my brake lights. so i am thinking there is something up with bulbs or the wiring for the mod needs to undone and the wire needs to be soldered with heat shrink put over them. I am just curious as to why that would make my fog lights come on.. and if you guys think its the wiring of the bulbs. i also had the battery tested at work with a systems test. and my battery needs to be replaced could that be another factor? i wouldn't think LEDs would draw that much current they are all 12V bulbs from GPThunder so just some input would be nice..sorry for all the grammatical errors in this.
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  2. #2 Re: Fog lights coming on when i step on the brakes? 
    GrandPrix Junkie SeanGTP's Avatar
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    brakelight mod is buggerish. undo it. I did mine and it only created odd problems.
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  3. #3 Re: Fog lights coming on when i step on the brakes? 
    Donating Users Bronco Boy's Avatar
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    Being that the problem started with the install of the LED bulbs, I would guess that they are backfeeding. Sounds like your "stop light" circuit is backfeeding to the "park light" circuit, which can go everywhere. Try a diode on the "park light" wire at each tail light socket.



    Chris B
    2009 CX-9
    ** SOLD ** 2002 GT
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  4. #4 Re: Fog lights coming on when i step on the brakes? 
    SE Level Member KadenGT's Avatar
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    Quote Originally Posted by Bronco Boy View Post
    Being that the problem started with the install of the LED bulbs, I would guess that they are backfeeding. Sounds like your "stop light" circuit is backfeeding to the "park light" circuit, which can go everywhere. Try a diode on the "park light" wire at each tail light socket.



    Is there a certain diode should get?
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  5. #5 Re: Fog lights coming on when i step on the brakes? 
    Donating Users Bronco Boy's Avatar
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    Quote Originally Posted by KadenGT View Post
    Is there a certain diode should get?
    I used 1N4006 on mine.
    Chris B
    2009 CX-9
    ** SOLD ** 2002 GT
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  6. #6 Re: Fog lights coming on when i step on the brakes? 
    GXP Level Member z3r0's Avatar
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    i'm gonna say its the sequential tails

    as backinblack himself reports problems like this especially with digital climate

    Quote Originally Posted by TLSheff View Post
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