Originally Posted by Nasty Evolution

Here is some info for now, just to get the ball rolling.

I know there is another proclaimed how to for making the OEM fog lights work, but well it doesn't work. You have to make this MONSTER multi relay set up and it looks like total fail. I have figured out how to use the single stock fog lamp relay, stock switch, even the stock fuse if you want to go all out. There are several ways to do do this, depends what parts you can obtain from a donor car, and how much time you want to spend making it look 100% stock

I'm still in process of finishing up the install so this will be "how to" in progress until then. I have already tested everything and it works like a charm. Turn on the high beams and the fogs shut off just like stock even!

Best of all it's fairly easy, the hardest thing will finding some of the donor parts. Here is list of the parts you will need if you want to do it like stock.

H11 male harness plugs with pig tails, can be from an EVO or any car with H11 bulbs. Mine came from an EVO.

OEM fog light relay, this is a 4 pin relay.

OEM fog light switch.

If you want to do it perfectly you will want to acquire a complete fuse box from an HID EVO, you don't need the box but rather some of the female connectors inside the box that the relay plugs into, the fuse plugs into, and terminal 1 on the front ecu plugs into. Your other option is to find the appropriate size female spade plugs and snap them into the underside of the fuse box.

The only other thing you will need is some 3/8th wire loom about 6 feet of it, about 6 feet of red/black 2 conductor wire to provide the power to the H11 pig tails. In my case I will also solder the wires, and heat shrink.


First things first. Even though your EVO didn't come with fog lights the interior wiring and harness is under the dash. Simply find the harness taped up under the dash, it's down near the coin box/ dimmer switch. There is also a harness for the hid levels, but I chose not to install those. They were so pointless when I had them on my old VIII. Plug in the switch and figure out which of the dummy switch fillers you want to remove and install the switch in place. Your switch should light up now when the lights are turned on, but that's about it.

Next step is to pop the top off of the under hood fuse box (the big one)
You will see a long rectangle box, with release tabs on the side. This is called the front ecu. It works in conjunction with another SWS ecu inside the cabin (not the engine ecu) Anyways. When you remove the front ecu, you will see a bunch of male and female electrical connectors. The non HID cars are missing 1 of the connectors. This connector sends a signal from the front ecu to the fog light relay to turn on the relay and to turn off the relay when the high beams come on.

The next step is a tad tricky at first. You will basically need to get the fuse box away from it's mounting location and gain access to the inside of it. Remove the two 10 mm bolts that secure the fuse box to the body of the car. Now you have to seperate the smaller relay box that is attached to the fuse box. This is done by releasing two taps and pull up on the relay box. The tabs are easily pushed over with a screw driver from the top. I will post a pic of the tabs when I get a chance. Now you will have to wiggle the relay box up, it's touch because it has some short wires coming out from the bottom of it, just take your time, and be easy. Once you get it free the fuse box can be moved from its mounting location. This will allow you to work around it and split it open. It too has release tabs that most be pushed over and pulled to separate the fuse box halves. There is one tricky tab which I will try and get a picture of also.

Once you have the box in half you will have access to the inside of the fuse box. This is where having a donor box will come in handy, you will need to remove some terminals from the donor box. You will want to locate the 4 terminals with wires from the fog light relay, they have some push release tabs on the top side of the fuse box. Push tab and pull out from the bottom. The fog light relay has 4 wires, two of them are 12v + getting power from the battery through the fog light fuse. Or any fused wire if you don't have the oem fuse box parts mentioned above just run 4 wires up through the bottom of the box and put female spade ends on the wires that will slide over the relay pins. The OEM relay looks identical to all of the other relays in the fuse box, just install it to match the others. I will post up a diagram of what wires to go which pin on the relay.

I will be adding more to this tomorrow

Originally Posted by Ryan.Kauz

Bumping this up to see if a complete "how to" was ever finished...

Originally Posted by golruss

+1 want to know too!!

Originally Posted by spaceman

please update with a tutorial and/or some pictures.

Much appreciated!