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Old 04-10-2007, 02:03 AM   #1
Fail Wagon
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98 Silverado

Default Aftermarket fog lights on regular light switch.

hey guys so i have after market fog lights and when i turn off my car the fogs will stay on. so i am wondering if there is a way that i can splice into the wires that run my regular headlights so if my headlight switch is off then even if the foglight switch is on they wont come on. but if the headlight switch is on then the fogs can come on. basically i want controll of my fogs to be built in to my regular light switch so it turns them off if i turn off the lights but i want to be able to run the lights without fogs on too. hopefully that wasnt too confusing
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Old 04-10-2007, 04:38 AM   #2
Cougar4
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You can do that by tieing the return (ground) side of a relay coil to the light switch. You will need to install a fused power lead to the main power lead from the battery. Then tie the power lead to one side of the switched contacts of a relay. Tie the other side of the swtiched contacts to the fog lights and the other lead of the lights to a good ground. For the relay coil, tie one side of the coil to the power lead with the fuse on it. For the other side of the coil tie a lead to it with a switch in series. Mount the switch where you want it and tie the other side of the switch to the light switch. The wire color you need to tie to for the light switch will depend on if you have day light running lights or not. If you have them, the color of the wire on the light switch should be black/red. If not, the color should be blue/black.

With this setup you will be able to turn the fog lights on or off only while the headlights are on.

There may be a spare relay socket in the power/relay panel you could install a relay in.That would be a slick setup. You will need to figure out the wiring of the socket though. I may be able to use my data to figure it out if you have one.
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Old 04-10-2007, 01:47 PM   #3
Fail Wagon
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damn, i was hoping it was going to be more simple like putting the fog ground into the regular light ground and that would be the trick. i guess not haha
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Old 04-10-2007, 03:10 PM   #4
rougeben83
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You'll need a relay to run your fog lights anyway. Tying the positive of the foglight switch to the headlight so that the only way the foglight will get power is when the headlight switch is on, is all you'll be adding
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Old 04-10-2007, 04:17 PM   #5
pinkrobe
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There's a great writeup of how to do this sort of thing on www.scoobymods.com.
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Old 04-10-2007, 09:22 PM   #6
Cougar4
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Quote:
Originally Posted by sirbikealot7 View Post
damn, i was hoping it was going to be more simple like putting the fog ground into the regular light ground and that would be the trick. i guess not haha
You don't want the light switch to have to run the high current the lights use so you need the relay. This really isn't much of a job to do and is pretty standard for what you want to do.
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