Supra Forums banner

1 - 20 of 25 Posts

·
Stock Twins King
Joined
·
4,397 Posts
Discussion Starter #1 (Edited)
To All:
I have finally figured out how to wire the Fog Lights, so you can turn them on when ever you want. You can even turn them on all by themselves. This is what you need to do: I will attatch 3 jpg.'s
1) Fuse panel location (next to battery)
2) Fog relay wire diagram
3) How to splice

First thing to do is to remove battery cable. Open the lid to the fuse box(Fuse panel next to battery). Remove the 3 nuts that hold the fuse tray to the car frame. Don't forget there is a nut under the red lid. Pull up and out the fuse tray. You will need to lift up the wire harness out of the tray, so you have room to lift up and flip over the fuse panel. You need to work on the back side of the fuse panel.
Locate the "Fog Relay" (bottom center)
You will see 4-wires, pins 1,2,3,5,
The task here, is to CUT the "red/black-stripe" wire (see drawing). Take the cut end of the red wire the connects to the relay itself, and splice it into the Green/red-stripe wire on pin 3 (or any way you can splice it into green/red-stripe wire). You no longer need a connection from the other end of the red wire you cut. That used to go to the "headlight" relay. Hence the reason you needed to have your headlights on in the first place.
What I did was to scrape a small portion of the sheathing away on the green/red-stripe wire so i could wrap the red/black-stripe
around it. I "soldered" this, but I suppose you could just tape it up. I also put a small piece of tape around the end of the no longer needed cut end of the red/blk-stripe wire so it would not touch anything. The final goal here is "bridging" Pins 1 & 3 together.
That would do it! Put everything back, and enjoy!


Edit: Jan 2004

I noticed today that my fog lights did not work. I spend an hour researching the problem. It turned out to be something I didn't mention in this original thread. Under normal conditions, when you push your headlight switch forward to high beam, it cuts the power off to the fog circuit. Well, for some reason, when I last drove my car, I had the high beam switch on. So when I reached in the drivers window to turn the fog lights on, they didn't work.
All I needed to do was flip the switch back to *low* and they went on! So this mod will not allow the fogs to be on when you are in High Beams.

Here is a file with all the Info:

http://97supraturbo.com/Tech%20stuff/Fog%20Light%20Mod/Fog%20Light%20Mod%20File.pdf




 

·
Super Moderator!!ON PATROL ALL OVER!!
Joined
·
10,459 Posts
very very nice props too you i think mkiv.com should use your idea!
 
J

·
Guest
Joined
·
0 Posts
I think the fogs go off when you turn on your high beams. Am i right?

jw,
Josh
 

·
Stock Twins King
Joined
·
4,397 Posts
Discussion Starter #11
Attatched JPG of my Fogs "on", with nothing else on. Keep in mind, that when you turn you fogs on, your instrument lights will not go on. You just have to remember that they are on in the daylight.
There is no "auto" shut-off with these.
They WILL stay on when you turn you highs on. Basically, this mod allows you to do where, what, and when to use them.
 

·
Highway Demon
Joined
·
2,869 Posts
i did this mod about 3 or 4 months ago by using a test light to figure out which prong on the relay needed to be powered to turn on the foglights.. and what i did was instead of wiring a constant power to the foglights i T taped it to the side marker on the front side of the bumper.. so the foglights can be turned on when the driving lights were on.. that way it will turn off automaticaly with the car when you open the door after the key was out of the ignition.. basicaly i just did this so it would be independant of the headlight.. so you can turn them on with the driving light instead.. if you just run a constant power to the prong then what if you forget to turn off the foglights one day? your battery will be gone.. i should have thought about writing a tech article about this just as you have but i guess i wasn't thinking about that when i had done it the first time.. i'm glad someone had decided to write about this though.. my mod was a little bit more simple though because instead of working under the fuse panel i just pulled out the relay and figured which prong needed the power for the fog lights to turn on.. i then bent that prong outward so it would not touch the connector that keeps the foglights dependant on the lowbeam had a wire attached to that and ran the wire along side the fuse box and out the opening that was ment for the wires to exit the box.. then connect that wire to the wire harness that is right behind the driverside headlight that runs to the sidemarker..

Brian
 

·
Super Moderator
Joined
·
46,550 Posts
Nice tech work Stu. My secrets out!!!!!!!!!!

I did this mod back on my 94 in 94,and did it on the 98 also.

My Master Tech at my dealer and I had figured it out.

I had done this mod on my 84,86.5,87,89,and 92.

It took a while to figure out on the 94 but was well worth it!

I also installed 100wt bulbs on the fog's and found that for city driving it had provied enought light for crusing around,and it looks cool!

For today I asssume a lot of you MKIV guys are going to be in the garage !!!!!
 
J

·
Guest
Joined
·
0 Posts
What bulbs are in the fogs? can they be xenon'd? I'm a big fan of xenons and having tri xenon headlights would be awesome :D

Lates,
Josh
 

·
Stock Twins King
Joined
·
4,397 Posts
Discussion Starter #17
Brian,
I think your mod would be more desirable. You are correct about the auto turnoff. That happened to me today. Daylight is a problem/ There is no prob at night, because you will see them.
Keep in mind that if you mess with the intergration relay that is used to tell you one of your lights are burnt out, you'll fry it, and they cost $300+ to replace. They are extremely sensitive to current draw. That is why I did not wire them to my running lights cause of the IR. You can do that if you re-wire everything with 12ga wire. Then you will not draw any excessive current.

As far as Josh's question, I am running PIAA's Super Whites. Although I am waiting for my new H3's Fogs from UK. I ordered the 100W "Rally Lights" They are supposed to be Ex bright, I think thats what Brian uses. They just don't last long cause of the exisiting wire gauge in the car. If you re-wired at 12ga they would last forever.
Later

Stu
 

·
Highway Demon
Joined
·
2,869 Posts
when i did my mod the first time i noticed a problem because i didn't bend the prong and it was still in contact with the connector thus sending a little bit of current to the headlight lowbeams.. but by cutting the side of the relay and bending it forward so it dosn't touch it solved the problem.. just a little bit of explanation as to why i had to bend it.. oh yeah and i havn't had any problems thus far at all since i had done this to my car.. maybe i'm just lucky or maybe not but all i know is that my car is fine and so is my friends car.. that i've done this to.. but thanx for the tip though i trust your tech nology more then mine because i'm still learning... i'm not a newbie anymore but can and will always learn new things :)

Brian
 

·
Registered
Joined
·
759 Posts
stumove said:
Brian,
I think your mod would be more desirable. You are correct about the auto turnoff. That happened to me today. Daylight is a problem/ There is no prob at night, because you will see them.
Keep in mind that if you mess with the intergration relay that is used to tell you one of your lights are burnt out, you'll fry it, and they cost $300+ to replace. They are extremely sensitive to current draw.

Stu
In the event that you do fry your integration relay (like i did while i was wiring my alarm) you can repair the board by soldering in new resistors (you'll be able to tell which ones because they'll be all burnt and smoky.) You'll have to find a specialty electronics store though. . .radio shak doesn't carry enough of a variety of resistors.

Whatever the case. . .$4 in resistors sure beats $300 for a new relay (and you can't find 'em in parts yards. . .)
 
1 - 20 of 25 Posts
Top