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Fog light wiring

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Old Jan 1, 2026 | 05:19 PM
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Originally Posted by wetskier2000
1998 C5. Trying to have the fog lights available without regard to the high/low beams.. I'd like to use them with high and low beams...
I read this three times and I still can't make sense of it.
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Old Jan 1, 2026 | 06:48 PM
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Originally Posted by lucky131969
I read this three times and I still can't make sense of it.
The stock c5 setup only allows the fog lights to be on with the low beams. I'd like to modify the car so that I can have the fog lights on with the low beams or the high beams.
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Old Jan 1, 2026 | 08:09 PM
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Vette lights sells a High 4 harness that does this I believe
https://www.vette-lights.com/product...VKi8tPQ07jzLbA
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Old Jan 1, 2026 | 09:14 PM
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Originally Posted by wetskier2000
The stock c5 setup only allows the fog lights to be on with the low beams. I'd like to modify the car so that I can have the fog lights on with the low beams or the high beams.
Having fogs on with high beams is both illegal and counterproductive. The fog light provide additional illumination in the foreground and high beams illuminate far down road. The additional light from any decent set of fog lights will provide so much foreground glare that seeing anything the high beams illuminated will be difficult.

That being said, you CAN turn on the fog lights without the headlights by moving the headlight stalk to the parking light position (one click) then turning on the fog lights.
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Old Jan 2, 2026 | 02:01 AM
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Originally Posted by wetskier2000
1998 C5. Trying to have the fog lights available without regard to the high/low beams.. I'd like to use them with high and low beams... Any way to do this?

I thought I might rewire the fog light switch to activate a new relay and wire that new relay to the fogs, but I don't think the switch works that way. I suspect it isn't really on/off 12v but a signal to the BCM instead. Anyone know?

thanks
I put my headlightswitch i Park and activate the Foglights with no issues .
Upgraded the foglights to HID and drive the car like this most of the day


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Old Jan 4, 2026 | 08:29 AM
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It looks like the 4 High harness will activate all 4 headlight filaments but doesn't say anything about allowing the fogs on with the high beams. Hidden, undocumented feature maybe?

I understand the illegal, unneeded arguments, but this car isn't your normal C5. It's been rebodied and has a ridiculous rake making the headlights pretty useless. I'm just trying to get as much light on the road as possible. The high beams are about equivalent of the low beams so illegal probably isn't a big issue. Here's a pic, the fog lights were added behind the lower grill.

I'm thinking of cutting up a spare trunk lock/fog light switch unit to change the fog light switch from a momentary BCM signal unit to a lighted rocker 12v+ switch then wiring my own relay and fog light circuit. Anyone done this? Will the BCM complain about being cut out of the equation?





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Old Jan 4, 2026 | 08:32 AM
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Old Jan 4, 2026 | 12:00 PM
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Rebodied indeed....
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