MK4 VW OEM Foglight Wiring Installation

In this Steve's Garage video I wire up internal OEM style fog lights on a MK4 Jetta. This MK4 Jetta didn't come with fog lights from the factory, but they can be added by purchasing a couple parts, and doing some simple wiring.
I bought used OEM VW headlights and headlight switch, and purchased the wiring harness online. There are many websites that sell the harness to add fog lights to a MK4 VW. Just find the cheapest website, and go that route. The how-to is pretty simple, even if you've never done electrical work on your car before. If you have any questions, please let me know!
ECS Tuning Wiring Harness - www.ecstuning.com/b-ecs-parts...
As always, I am not responsible for any damage that may occur when working on your car by following the instructions in this video.
Steve's Garage Social Media -
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#stevesgarage #mk4vw #vw
Chapters:
0:00 - Intro
0:21 - Tools You'll Need to Wire Internal Fog Lights MK4 VW
0:54 - Mounting the Relay for Internal Fog Lights MK4 VW
1:57 - MK4 VW Internal Fog Lights Engine Bay Wiring
3:25 - MK4 VW Internal Fog Lights Interior Wiring
4:12 - MK4 VW Internal Fog Light Wiring to Battery
4:21 - Outro

[@-loki-7727]

Thank you! Wiring and switch was just dropped off and this was exactly what I was looking for.

[@StevesGarage]

Awesome! Hope you enjoy them. Because they're hard wired, the fogs stay on with high beams which I think is my favorite thing about these.

[@SanDiego_VDubLife]

Thanks dude. I will try this out. Didn’t realize I needed to buy the wiring for the fog light. I forgot about that. I will have to do that next time. Thanks for the detail on the PIN numbers.😊

[@StevesGarage]

No problem! Yea, the wiring isn't there, just the ability to add it is.

[@SanDiego_VDubLife]

@@StevesGarage I just finished installing the halo lights on. Now I will order the wiring from ecs to hook up the fog lights. I already have the head light switch from ecs but it’s useless unless you have fog lights. I even ordered the one for rear fog lights in case I ever get some.

[@StevesGarage]

@@SanDiego_VDubLife Nice! I finally got a set of euro rear lights so I can hook up a rear fog, but I would need wiring and a switch. Not sure I really feel like going through all that right now, but it's nice to have the option.

[@thedokey113]

Awesome video thanks

[@StevesGarage]

Glad you liked it!

[@mailjabber]

Subbed for the shout out for Volky Auto Dismantler. Tito is my go to guy for MK4 used parts!

[@StevesGarage]

Thanks so much! I've only ordered the headlights from him, but have spoken to him about some other parts before. From everything I've head he's a great dude and runs a great little shop.

[@FnkBssGroov63]

Thank you for the video ! Nice clear good explanation . Off the subject question: On this assembly there's a small light bulb wire/socket , Just Under the headlight bulb ,, Any Idea what is that one for ? " Is That "City Lights" ? thanks again

[@StevesGarage]

Glad you found it helpful, thank you for the comment! I'm pretty sure what you're talking about is the city light, and I'm honestly not aware of any purpose it serves.

[@dmajumdar2059]

Thank you! Please provide a link, if you can, of the particular headlights you got.

[@StevesGarage]

www.ecstuning.com/b-hella-parts/gli-headlight-set/mk4glihk/ These are the headlights I bought, I just got them used, since I didn't feel the need to pay the extra for brand new ones. They are OEM, are in good condition, and even came with bulbs! Let me know if you need anything else!

[@owenroch446]

greetings, Whats the blue bit that you used to plug the wire into the headlight switch

[@StevesGarage]

You might be seeing the butt connector that I used to connect the piece that plugs into the headlight switch. If I remember correctly, I messed up the end trying to feed it through the firewall, so I had to crimp on a new end.

[@micahfaria6960]

Just wondering what these things take for bulb sizes. Everywhere i look someone has said something different lol.

[@StevesGarage]

The foglight bulb is an H3.

[@chadowensby3364]

What type of connectors and where did you get the connectors that go into the factory headlight harness, and the fog light switch? Thanks for the video. Very helpful.

[@StevesGarage]

The harness I bought came wired with terminals on the end. All I had to do was plug it into the existing harness plug, and get the corresponding switch with foglight option.

[@jlw7kid]

Chad Owensby I ordered a harness and it had wrong ends so I just cut some off a harness from a parts car n I was good

[@Sampsss]

hey nice video! can you link the wiring harness you got?

[@StevesGarage]

Thanks, harness can be purchased from these guys: www.vxtuning.com/shop/wire-harnesses-2/fog-light/fog-light-wiring-harness-mkiv-golf-jetta-r32/

[@elmaz8503]

Where else could you run the positive and negative leads? Besides the battery.

[@StevesGarage]

The negative lead is just a ground, so you can run that to anywhere that's a good ground. As far as the positive lead goes, it needs to be connected to a battery or similar power source to power lights.

[@ntokozomgidi74]

I want to know how to you change the bulb when it doesn't work anymore please help.

[@StevesGarage]

The foglight and headlight bulbs are just behind the little 'door' on the back of the lamp. You pop that door of and the bulbs are inside.

[@pauliroha5506]

Hi Steve, thanks for sharing. Pls I have a bora with rear fog lights. I recently bought a new headlight with fog lights. I want to Use the existing fog light switch which has only rear fog light position to control both front and rear fog lights. How do I do that pls. Thanks.

[@StevesGarage]

In order to do that you'd have to combine the wiring that goes to the pin for the rear fogs. While I think it may be possible, I don't know enough to say one way or the other. What you'd have to do is splice the control wire for the front fog relay into the wire that controls the rear. I don't know which pin that is without looking at a wiring diagram or a google search. You could certainly try it, though the better route would be to just get the correct switch.

[@pauliroha5506]

@@StevesGarage if I have to combine the wiring from the rear fog lights, would there be any need for the relay kit? From the wiring diagram, the rear fog lights re fed by a 15A fuse, combining these wires, won't that be too much load on the fuse? How about if I increase the fuse from 15A to about 20A or so? Thanks

[@StevesGarage]

@@pauliroha5506 With a relay, the switch is just closing the relay to complete the circuit. That is a better way to wire something like lights because you don't have a full load going through the switch, the load of the lights is going through the relay. If you really want to combine them, you'd wire the front fogs properly, and have the control wire for the relay spliced into the headlight switch. That being said, I don't know how the rear fogs are wired, and it would be safer to make each it's own switch. Increasing fuse load is never a good idea. If it's wired to a 15a fuse, the wiring is probably only large enough gauge to handle that amount of amperage. Increasing by 5a might not be catastrophic, but in an extreme case it can start a fire. Also, if you have a problem with the wiring and the fuse blows, you don't know if it's an issue with the front fogs or rear fogs. Buying a new switch to accommodate both front and rear fogs would be the safest option. It's never a good idea to cut corners and start splicing things, especially cutting into OEM wiring and powering something like fog lights that have a larger draw than something like a dash cam.

[@ghabbarnoureddine]

Which number did you tie to the thread in the light switch?

[@StevesGarage]

It should be terminal 8 of the switch. You do need a switch with the foglight option.

[@gustavoaguilar9608]

It’s the same process with an auxiliary fog lights ?

[@StevesGarage]

You can absolutely use this same method for auxiliary fog lights! Makes things cleaner inside too. You might need some different connections on the lights themselves, but it should work the same once all hooked up.

[@dominicshelley1092]

Do you have a link to where you bought the wiring kit?

[@StevesGarage]

Sorry about that, I thought I had a link in the description! I bought the harness from ECS - www.ecstuning.com/b-ecs-parts/fog-light-wiring-harness-for-oe-fogs/1jo998000/

[@georgerosales179]

The yellow wire would be what?? Power?? Or simply a wire to send signal to the fog lights?

[@StevesGarage]

The yellow is a signal wire. All it's doing is telling the relay to open or close.

[@MichaelBrown-bt6hr]

I tried these type of headlights for my 2004 Golf VR6. Red wire to battery, brown wire ground, blue wire to switch #8, long yellow wire to pass. Headlight in plug #2, short yellow wire to driver Headlight plug #2. When the red wire hooked up the driver side fog light works but not passenger side. Am I missing something?

[@StevesGarage]

Are you using a relay? The red wire should go to the relay, and the yellow wires from the relay to the lights.

[@MichaelBrown-bt6hr]

@@StevesGarage yes I'm using a relay. I've been thinking about this alot and think maybe the relay is bad although it's new. Two wells ago bought a power relay for a Passat and it was bad.

[@StevesGarage]

@@MichaelBrown-bt6hr It wouldn't be the first time I've heard of that happening! Especially with these kits, the relays are usually pretty cheap and tend to be a weak point.

[@MichaelBrown-bt6hr]

@@StevesGarage I'll get another and let you know

[@MichaelBrown-bt6hr]

Do these instructions work for Golf GTI?

[@StevesGarage]

Yup! It's just a visual difference of the headlight itself, but wiring is the same between Jetta and Golf.

[@joelsonyambao5811]

One of my purple clips won’t come out and I don’t want to break it

[@StevesGarage]

The clips can be a struggle, but it should come out. Worse case scenario you could get a new clip from a junkyard or new clip. It would suck, but these cars are getting old, so plastic parts can get stuck, brittle, and break.

[@muushucanal3781]

What kind oF light does it have

[@StevesGarage]

Not exactly sure what your question is. The headlight being wired up is the GLI style that comes with the internal fog. The bulb for the fog is an H3. The rest of the headlight is the same as every other mk4 headlight.

[@SY-ml5nl]

Hi, on my car all I done was get the sport (gli) headlights an swap them with mine an also take the euro switch swap it an it all worked without adding that wire?! UK spec... Sportline edition = built in foglights including front/rear factory switch Highline edition = none foglights including rear fog light only I swapped headlights an switch. That's all Regards

[@StevesGarage]

I'm not familiar with UK cars, but for the US you have to add the wire if your car wasn't built with fogs or else there's nothing there to power them. I know of non VWs that have wiring for all the options built in (think one wiring harness for all build variations). With that type of setup if you want to add an option, it's just plug and play. Maybe because UK cars come with rear fogs the wiring is built in already? I'm honestly not sure. US cars don't need rear fogs, so there are only some euro cars come with them built in, otherwise you have to add that too.

[@SY-ml5nl]

@@StevesGarage hi, USA car don't have foglights?! So your bora/golf don't have any?! I did not know that. Regards

[@StevesGarage]

The GLIs came with front fogs. But yea, it's not law to have rear fogs here, though sometimes I wish it was. I live in a snow state, and they make a difference during a bad storm.

[@SY-ml5nl]

@@StevesGarage hi, that's crazy. If you don't have rear fogs which is the law in the UK then the fronts won't have no wire too. In the UK rear fogs are the law but the front are a extra payment option or a top spec standard item when the car is purchased new. So in the UK if you've got rear fog lights you bet you'll have the front wire already set up. I'll take a pic of my headlight swith from the back an forward it thru to you on here if it would be possible. Regards

[@StevesGarage]

Ahh makes sense. Yea in the US you only get the wiring on upper or optional trims!

[@BRVYDEN]

Is there no way to diy this? I’m not able to justify $100 on some wire and a relay from ecs

[@evoxterrier5124]

I just did this on a 2004 golf, the harness only cost me like 22 bucks from vxtuning

[@StevesGarage]

Unless the prices went up I thought it was much less. You can DIY it. Buy the wiring, relay, and terminals and make the harness yourself. I wanted to buy it pre-built so I could just focus on the install.

[@StevesGarage]

@@evoxterrier5124 Looks like VX is more than half the price of ECS, that's the move! It may be where I bought mine from, but I can't remember.

[@jlw7kid]

Would you be able to show me how the wires com off the relay cause mine are being funny

[@StevesGarage]

My relay only plugged in one way. What's going on with yours?

[@jlw7kid]

Steve's Garage mine is all hooked up and they just stay on with the switch not even on

[@StevesGarage]

​@@jlw7kid Definitely don't want that! Your power supply from the battery should be going to pin 30, fog lights to 87, ground to 86 and your switch should connect to 85. Let me know if that doesn't fix it for you!

[@jlw7kid]

Steve's Garage on the relay ?

[@StevesGarage]

​@@jlw7kid Yup