after market head light ?

got after market light for my jetta

can't get the fog lights to work.
there is only the oem style plug, is the factory headlight harness not wired for tthese lights?
I have euro headlight switch install.

If the car didn't come with factory fogs, you'll need to run a wire from the back of the switch to the headlights.

See this post for more info:
http://forums.tdiclub.com/showthread.php?t=37585

Just to clarify, if the car did not come w/ fogs originally, you'll need to run a wire from the headlight conx to a relay and power from the relay to the headlight. You want to trigger the fog from the headlight switch, not power it from the headlight switch.

Good info in the link above.

Just did this on the daughter's wagon. Hardest part was snaking the trigger wire in to the cabin (and then over to the switch): the term "pushing on a string" comes to one's mind.

I got a nice kit w/switch (off of ebay I believe) for $44. No messing with wire lengths and such; the fit is excellent. Came with relay and, as noted, the dash switch (claimed to be an actual VAG one). Had a ton of other work to do, so having something plug-and-play was worth the savings in time for me.

RexNICO said:

Just to clarify, if the car did not come w/ fogs originally, you'll need to run a wire from the headlight conx to a relay and power from the relay to the headlight.

Click to expand...

....this will involve adding another terminal wire to the plug that plugs into the headlight switch, since the harness is not likely wired for fogs.

Best way to get the specific terminal wire is to buy a "repair wire kit" from the dealer... a yellow wire about 18" long with a terminal on each end. Which you then cut in half to give you two terminals.

Some additional wiring hints here... including which specific headlight switch terminal you need to add the wire to (pin 8) and the dealer part number for the "repair wire kit":

http://forums.tdiclub.com/showthread.php?t=37585

You can also just buy a fog light wiring kit, which generally comes with the correct terminal, a relay, fuse, etc. Here's one example:

https://www.ecstuning.com/b-ecs-par...Wbqv6XUzZ2SUUlrSM3v6MM7fqUMmlpOzVChoC9D3w_wcB

car did not have factory fog lights
so do I have to rewire the headlight plug or can I add a wire to the oem plug?

To me "rewiring the headlight plug" and "adding a wire to the oem plug" are kinda the same... but in any event "adding a wire to the oem plug" is more descriptive of what you actually do.

You add a new terminal (with attached wire) to pin 8 of the oem headlight switch plug, which you then connect to a relay you install... that supplies power thru a fuse you install... to a wire that you run to your new headlights.

Dunno what you'll need to do to run this new wire into the fog lights themselves... it depends on the harness your aftermarket headlights are expecting...but if it has the factory plug-in you'll need to add a new terminal there too. Many after-market kits have a separate wire for the fogs, so no additional terminal required. Mine had a separate wire to the fogs.

It's not plug-and-play: you've got to install a relay, a fuse, additional terminals, and then do a bit of wiring including a run thru the firewall to the front of the car... which is why many people buy a wiring kit.

As per the thread I linked above.

the lights have all the bulbs wired to the oem style plug

zukin said:

the lights have all the bulbs wired to the oem style plug

Click to expand...

Ok, then the second post / first picture in the thread I linked to shows you where you'll need to add an additional terminal to the headlight plug itself... top row, pin 2.