OEM Foglight Install - Submitted by 04 elantra cvvt Prior to install: First thing you will need to do is order the lights, factory multi-function switch, the factory relay, and two connectors for the light bulbs. Buy the following wire: 12 ga. yellow (20 ft.), 12 ga. Green (4 ft. should do), 16 ga. red (6 ft.) and 16 ga. black (20-25 ft.) Wiring in the relay: 1. Go to your local dealer, and ask them if you can buy four connectors out of their Hyundai Wiring Harness Repair Kit. You will need 2 of the 1/4 inch female connectors, and 2 of the 3/16 female connectors. 2. Open the relay center, and you will see the spot for the factory foglight relay. Take out the two 10mm bolts holding in the relay center, and take off the back of the box by releasing the five or six clips. You will now see all of the massive wiring harness that goes into the car! Anyway, locate the four open slots in the back for the factory relay. 3. The relay will be labeled with the following numbers on the terminals. 85, 86, 87, and 30. 4. Take the first 1/4 inch connector and attach it to a short length of the 12 ga. yellow wire. Plug it into one of the large slots, and run the other end to the large white wire that is bolted to the main fuse in the corner of the relay center. (This wire is connected directly to the battery). Connects to terminal 30 of the relay. 5. Take the other 1/4 inch connector and attatch it to the rest of the yellow wire. Plug this one into the other large opening in the relay box. This will run down to the foglights. Connects to terminal 87 of the relay. 6. Take one of the 3/16 connectors and attatch it to the 16 ga. red wire. This will run down to the driver's side sidemarker light. Splice into the power wire of the sidemarker. Connects to terminal 85 of the relay. 7. The other 3/16 connector should be wired to the 16 ga. black wire and run into the car. This will ultimately go to the multi-funtion switch, but we'll get to that. Connects to terminal 86 of the relay. Now the relay is wired. Running power to the lights: 8. Take the 12 ga. yellow wire coming from terminal 87 of the relay and run it behind the headlight down to where the foglight will be. Wire this to one of the pig-tails you got to plug into the light. I used a t-tap to splice into this 12 ga. yellow wire so I could run the rest of the 12 ga. yellow to the other side of the car for the other foglight's power. 9. Connect this to the other pig-tail. Now you have the power run to the lights. To complete this step, find a likely spot to drill and bolt down your grounds for the lights with the 12 ga. green wire you bought. Make sure you scrape the paint off of this area before connecting the gorunds. Power to the lights is complete. Wiring the multifunction switch: 10. You will need to remove the cover of the steering wheel, and remove the old multifuntion switch. Here is the multifunction wiring diagram from www.hmaservice.com: 11. Look at the wiring of the switch. You will need to bring the 16 ga. black wire you ran into the car up the steering column now. This end will be connected to terminal #12 in the connector. 12. Take the extra 16 ga. black wire and connect it to terminal #13 in the connector and run this wire back down the column to a solid ground. 13. There will be wires already connected to both of these terminals in the harness. One of them (the yellow wire) is looped to terminal 10. I just cut both of these wires. One is yellow, and the other is green. I did testing before I cut them, and everything still works. 14. Once the ground is connected under the dash, the system should work. The whole purpose of this wiring is to complete the ground for the relay. Note: Wiring the lights this way will let the fogs come on with the parking lights and stay on with the headlights (high and low). It seems like a lot of work, but it will look completely factory when you are done. As long as you hide the wires well, and use some convoluded wire loom to run the wires in. Picture of relay box: See this thread for more info on this Do It Yourself Guide.

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