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Power source question

This is a discussion on Power source question within the Stereo and Electronics forums, part of the General Help category; I've tried searching around, still not sure.. I have aftermarket fog lights that are taking their power straight from the ...

  1. #1
    Member Selride's Avatar
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    Power source question

    I've tried searching around, still not sure.. I have aftermarket fog lights that are taking their power straight from the battery. There's a switch to them that is ran through the firewall and into the cab. Sometimes i'll forget to switch them off.... bam, dead battery...

    Is there a power-source under the hood that will give out good juice, and will only be hot when the ignition is on? I'd rather not try and mod the switch, but just want to re-run the power to something other than the battery.

    Thanks!

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    Member Mike's TA's Avatar
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    The connections for the factory fog lights?

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    Member Selride's Avatar
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    These are 50$ autozone specials, technically "driving lights". I have them mounted behind a billet grille. There is a power going to my battery, then a hard-wired switch that runs through my firewall into the car.

    I thought about getting some kind of relay that will splice into the power. Then run the trigger wire to a fuse under the hood that's only hot when the ignition is on.

    Last edited by Selride; 02-11-2008 at 11:58 AM. Reason: added picture for eye candy

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    Senior Member bigrondownhiller's Avatar
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    Quote Originally Posted by Selride View Post
    These are 50$ autozone specials, technically "driving lights". I have them mounted behind a billet grille. There is a power going to my battery, then a hard-wired switch that runs through my firewall into the car.

    I thought about getting some kind of relay that will splice into the power. Then run the trigger wire to a fuse under the hood that's only hot when the ignition is on.

    Click for full size
    You should definatly run a relay. The lights are probably pulling more current than the switch is rated for.

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    Member Selride's Avatar
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    The lights came in an all in one box, switch, relay, lights, everything. I just want to connect the power to something that is only hot when the ignition is on.

    I went to autozone today and explained what kind of relay I wanted: something inline on the power, that could receive a signal to flip on and off. Same analogy as the remote line to an amp to have it power on and off with the ignition. They said they don't even make such a thing

    I just spent the last hour wiring the power to the Air Pump power in the fuse box under the hood. I have headers and had the air pump removed, so there's a 30amp current just begging to be used. I spliced into the Air Pump wire under the box with a 30amp inline fuse, which is perfect because the fog lights are rated at 30 amps.... wtf, the air line is hot all the time too......

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    Senior Member bigrondownhiller's Avatar
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    This is what you want http://store.classicgarage.com/hellarelay.html. Most auto parts stores have them near the fog lights or near where they have wiring products.

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    Member Selride's Avatar
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    Update: purchased a relay from the local radioshak, can't remember the price, but it didn't break the bank.

    Works like a charm, goodbye to dead batteries!!

    I've included a short short write up for anyone looking to do something similar:

    Inside the driver side fuse-box closest to the headlights there are 3 banks of 10-20amp fuses. Most of them are only hot when the ignition is on, but I would check with a voltmeter before splicing.


    I chose the front most fuse because it was the easiest to get at when you pull the box up to get underneath. I used a inline splice to run my trigger wire back over to the battery side of the car.


    You'll have to get the proper slide-on connectors at auto-zone, but connection to the relay is fairly straight forward. Connect the trigger wire, run the opposite side to a ground screw. Then run the "30" to your battery with an inline fuse, and it's opposite side to whatever you're trying to power.



  8. #8
    Senior Member bigrondownhiller's Avatar
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    Good job. They probably work great.

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