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Thread: Someone Double Check My Relay Suggestion

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    Forum Moderator Leemarksmith's Avatar
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    Red face Someone Double Check My Relay Suggestion

    Cheers 1st of all to Robsey for pointing me in the right direction

    But does the below attatchment look right considering the power sources - As both come on with key-fob?

    Which pin will overide when the key fob is pressed/car unlocked... Obviously on an unlocked car (dash off) and doors open, interior light feed is main power to LED'S, then shut doors and put side lights on, dash light feed then powers the LED'S.

    But if the 2 sources are live for the 10 or so seconds when fob is pressed, which feed or PIN is primary if any? or does the relay just fail until only 1 source is live - so after the 10 second delay :

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    Regular Member ScotsDragon's Avatar
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    You can just use a permenant 12v sourse instead of dash illumination then the led strip will light when the the interiior light is on ie locking, unlocking and when you press the switch.
    But using a relay to power the leds you will lose the fading effect of the interior light they will just switch off.
    I would just wire led directly to interior light, if all lights connected to interior light circuit are led including interior bulbs front and rear they will be using less power than the 4 501 bulbs the the circuit normally powers.

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    Forum Moderator Leemarksmith's Avatar
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    The only problem with that is the LED's that are being powered are these...

    http://www.vectra-c.com/forum/showthread.php?t=112369

    Thanks for the suggestion but I dont want to make these permanent DRL's so discounted the 12v way already. Its either the above works, or i'll probably leave it TBH.

    The sidelights and fogs already come on when unlock at min as wired to dash illumination. Then stay on when headlights are put on... so thats fine but...........

    I'm now putting LED's into the rear lights, but i cant or dont want to use the same dash illumination as i dont want the rear LED's on when lights are on if get me... so i thought the interior light would be the best option...

    Only thing is if i leave the fronts alone and just do interior light feed for rears. The dash and int light time delays are different, plus int light stays on if doors are open so rear LED's also would, fronts wont.

    So I wanted to add another power feed for the fronts. so the front and rear LED's both have the same time delay, on with doors (so pretty much like footwell lights) but the the relay overides the front back to dash illumination feed - hence needing the relay...rear LED's are just going to be fitted like footwells, straight feed.


    Hope this all makes sense to people, lost my way 3 times writing this lol...

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    Regular Member ScotsDragon's Avatar
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    even with a 12v fed instead of dash illumination the relay is activated by the interior light,
    when the interior light is on that powers the relay and it connects pins 30 to 87 completing the 12v to led circuit,
    when the interior light is off the 12v to led light circuit is broken.

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    Regular Member ScotsDragon's Avatar
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    just been thinking about this one,
    Am i right in thinking you want the rear led lights to come on with the dashboard illumination but only when the interior light is on and not when the lights are on.

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    Forum Moderator Leemarksmith's Avatar
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    Quote Originally Posted by ScotsDragon View Post
    just been thinking about this one,
    Am i right in thinking you want the rear led lights to come on with the dashboard illumination but only when the interior light is on and not when the lights are on.
    Kinda... i just want the rear lights to come on when i unlock the car... thats pretty much it...

    fronts do now, but are then perma on when use headlight switch, but i would not want the rears to do this...

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    Regular Member ScotsDragon's Avatar
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    Wire up the relay like you diagram but swap round dashboard illumination and interior light, this will turn on the rear led when dashboard lights are on only when the interior light is on ie locking, unlocking, door open or switched on inside



    This way you are using the interior light to power led and the dashboard lights as the relay trigger to switch them on

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    Forum Moderator Leemarksmith's Avatar
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    Yeah but the relay is needed for the front led's only...

    The rear one i'll just take a direct feed from interior light, thats easy... The fronts need to be key fobbed on from the light, then lit from the dash. thats where the problem lies... would the above solve that?

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    Regular Member ScotsDragon's Avatar
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    just use a permenant 12v source for front lights instead of interior light (pin 30), this means the front lights will be on whenever the dashboard lights are on.

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    Forum Moderator Leemarksmith's Avatar
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    Looks like it'll have to be that then... cheers

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