jrprich

Wondering if anyone knows a way to keep the fog lights On when the brights are On as well?

Thanks in advance,

Jim

Never mind, found this excellent harness by Toque:

post #1, pic #5

https://www.corvetteforum.com/forums...rojectors.html

Thanks Toque ;^)

Vetteman Jack

Here's a file that talks about that mod.

jrprich

Thanks,

I guess age is putting a huge muffler on my memory as I had forgotten all the effort in that process back in 2008
I had all 6 lights working fine after all that back in 08 so I am guessing that when I added a new relay harness for the new HIDs to my high beams earlier this year (2015) I somehow undid part of the 2008 mods as my fogs returned to Not turning On with the high beams.
I apologise to all who helped back in 08 for somehow messing up what we had worked out in 08
Getting older sure sucks

Jim (jrprich)

jrprich

Well age is what I am blaming for my inability to puzzle this out

Torque's great pic doesn't indicate just which relay contact each wire connects up to (85,86,87,30) so I am wondering if anyone has this info.

I am concerned that if I hook the relay up wrong I will fry something else.

Also, does it matter which leg on the fuses 6 and 22 are used?

Thanks in advance,

Jim

feeder82

Download this file it has the info you need, post #2

jrprich

Thanks all,

Mark replied back with the specifics.

Jim

Relay Pin 30 - Connect directly to 12v battery + terminal. (make sure you fuse this with 20a)
Relay Pin 85 - Connect directly to Chassis Ground.
Relay Pin 86 - Connects to High Beam Fuse #12. This is your Trigger voltage. Engages the contactor in the Relay.
Relay Pin 87 - Connects to Fog Light 20Amp Fuse #6. This is your 12v that turns on the Fog lights.
Relay Pin 87a - Not used.

BADBIRDCAGE

Knew it could be done. Also know that in every state I have lived in requring annual vehicle inspection it is illegal to have fogs on with high beams. That's why factory systems are designed to turn fogs off when high beams are engaged.

Doesn't seem to impact the guys with high-rider 4x4's and the 12 plow lights on the bar sticking above the cab though.

Toque

Jim

I added all the above information to my web site last night. I'm glad you asked me this question. It helps me make sure I have good information on my site.






Here is a good picture of a typical 12 Volt Relay



Relay Pin 30 - Connect directly to 12v battery + terminal. (make sure you fuse this with 20a)

Relay Pin 85 - Connect directly to Chassis Ground.

Relay Pin 86 - Connects to High Beam Fuse #12. This is your Trigger voltage. Engages the contactor in the Relay.

Relay Pin 87 - Connects to Fog Light 20Amp Fuse #6. This is your 12v that turns on the Fog lights.

Relay Pin 87a - Not used.


Basically what happens is this....

1.) Once you turn on your HIGH BEAMS.... pin 86 will be supplied 12v
2.) Pin 85 is grounded so it will ENGAGE the contactor built into the relay.
3.) Pin 30 has 12v power on it at all times, and because the contactor triggers, it will allow voltage to travel from pin 30 to pin 87 .... thus supplying power to the Fog lights.


Toque

LoneStarFRC

Excellent write-up and pictures.

Just as an extra comment to all members desiring to use this mod, the relays Toque used are very common design/style and are available from a very wide variety of sources these days under all sorts of different brand names, a TON of those being cheapos from China. This particular design/style was originated (or at least widely popularized) by Bosch Co. and are often referred to a "Bosch" relays, even though they may be of another brand name. IOW, the term "Bosch" has become almost generic.

Takeaway here: Don't be lured by some $1.99 or $2.99 cheapo price. USE THE BEST QUALITY YOU REASONABLY AFFORD i.e. Bosch, Tyco, etc. If you have a choice of sealed vs non-sealed, buy the sealed. It lives under the hood subject to heat and humidity (code for corrosion), etc.
You will only spend a little bit more ($6 or $7.00 to $10.00 range~) but with relays that you want to be durable, "less" is DEFINITELY not "more".

Toque

Very good information...

Toque

LoneStarFRC

Don't mention it. You always have good info in your how-tos and you do things the right way. It takes a lot of time to document, photograph, make diagrams, collate, edit, post, etc. and your efforts have not gone unnoticed, at least not by me anyway and I always look forward to your posts.

Toque

Thank you LoneStar !
I'm an engineer and rather detailed at my work.
I'm the same way at home with my hobby too.
Its just what I enjoy.....

Toque

Vetteman Jack

Good additional information that was added. Saved it to my file.

jrprich

Well guys, I have tried to make this mod work many times using Toque"s excellent info.........but for some reason it won't on my setup

Yes, I have checked and re-checked the wiring, fuses, and tried multiple relays more times than I can count.
When I turn on my High Beams the Fogs go OFF, I can hear the relay in the mod click. The same thing happens when the mod relay is not installed.

Perhaps it is my setup, so here is what I have:

Modified original ACA projectors that have 35w Phillips HID bulbs.
Each low beam HID has it's own relay harness that is connected to the battery and triggered from the stock Low Beam wiring harness. This is just as the kit came from ACA way back in 2008. In the stock ACA set up a Diode is used to allow the Halogen High beam bulbs to operate along with the HID Low beams.

Stock Chevy fog lights with aftermarket 55w HIDs fed by two ballasts. Both Fog HID ballasts are fed by one relay harness that is connected to the battery and triggered from the stock Fog Beam wiring.

Everything changed when I removed the Halogen High beam bulbs and replaced them with HIDs which are fed by one relay harness that is connected to the battery and triggered from the stock High Beam wiring.

Under this configuration, the HID Fogs go OFF as soon as the new HID High beams are turned ON.

Adding Toque's excellent relay harness to allow the HID Fogs to stay ON with the HID High beams has not been successful. ;^(

Suggestions would be greatly appreciated.......and many Thanks in advance

Jim