auburn2

I am looking at the fog light wiring, based on the manual there is a purple wire which is hot with lights on, with the high beam power lead attached to the other side of the bulb (light green wire). How does that complete the circuit when in low beams or parking?

I get why fog lights won't turn on with high beams on, same voltage on both sides of the circuit, but with high beams off what is the path to ground? Is the high beam circuit grounded in the dimmer when high beams are off?

I want to rewire so fog lights stay on with high beams on. I am thinking I can cut the green at each high beam and ground the lead coming off the bulb.

Kevova

High beams and fog lights isn't legal. Fog lights are only supposed to work with low beams or parking lights

auburn2

Ok a few things.

First I did not ask if that was legal, I asked a question about the wiring. Even if it was illegal (which it isn't), there is plenty of discussion on this forum of things that are illegal, like disabling EGR, removing AIR, removing catalytic converters ..... and speeding.

Second I don't for one second believe that it is actually illegal. Can you cite a federal law that makes using fog lights with high beams illegal? What I am doing is certainly no more illegal than the numerous other running lights or aftermarket light bars I could mount on my car. If it is in fact illegal at all it is only a state or local regulation and it would likely only apply to use or operation on the road, not actually modifying the wiring.

Sorry if my tone is a bit controversial, but I don't get why you chose my post to respond like you did.

Kevova

Then figure it out. I could careless.

RWDsmoke

That should work. I do believe when high beams are off, the green wire's path to ground is through the Hi beam indicator. The early c4 fog lights are independent from the headlights and one side of the bulb is directly grounded so they work on low or high beam.

PatternDayTrader

Seems to me that the fog light relay coil is grounded through the high beam filaments in the headlight bulbs. So when you turn on the high beams, the relay coil loses its ground and the fog lights turn off. Seems to me the answer you are looking for is to ground the fog light relay coil to any other ground.

grandspt

PatternDayTrader is correct. You will have to find this relay on my 96 it was under the passenger side dash.
I posted the mode some time ago if you search through all the LED headlight questions. But after you locate the wire from the relay to the high beam filament you will want to cut it and then put some heat shrink tubing over the high beam side of the wire, you won't use it anymore.
Then take the cut relay side and connect it to a good ground.
You are done, driving lights will work fine and so will your headlights.
Yes, the driving lights can be turned on when the high beams are on. I don't know about the legal implications but speeding is also illegal and we have all done that.

Renfield

Renfield

This has been done. If you read through this thread, there are two mods suggested. The one you want snips the lt. green wire at the fog light relay in the passenger footwell and re-ground it.

Check it here, good photos and instructions. https://www.corvetteforum.com/forums...-solution.html

WVZR-1

Post #5 confirms/agrees your thoughts

You might find it helpful to mention year regardless of the question you post. Early C4 fogs vary by year. Yours I believe is an '89. This should confirm also your question. One simple post! Your thoughts were correct. On your '89 fogs (after the modification) should run I believe 'independently' requiring neither high or low. I didn't check a wiring diagram for an '89.

https://www.corvetteforum.com/forums...post1555890226

FostersPerformance

Mine is an 88. When rewiring the entire car, i had fog lights, then didnt. Thought was a bad ground, but turned out, because i didnt have the headlights in car, they wouldnt work. Ground for fog light goes through headlamp harness. Drove me crazy for a day before i realized what was going on (reminded me of Christmas Vacation when Ellen figured out the light switch was off for xmas lights lol).......IF you want to, you can ground the fog lights as they get power from the fog light switch, from the headlight switch. Good luck!

auburn2

Thanks, It will be a bit harder than I thought, but doable.

auburn2

Thanks, this makes sense, it is an 89 and it would agree with the manual.

PoprocksC4

Pink with a black stripe

i don't know if this works for you but i wanted my fog lights to come on with the ignition key.
i grabbed the power from the pink wire drivers side up front.

auburn2

So basically daytime running lights ... or all the time running lights... nice.

Not sure that will work for my year though.

PoprocksC4

Check out my thread titled
Daytime running lights?
ihatebarkingdogs helped me alot.