The original headlights on my 2002 and 2003 Jetta MkIVs were no longer clear, and didn't have fog lights.
Having lived in Germany I knew that the European models had both a "city light" and fog lights. So, there
were a things needed, the Euro light switch and the Euro lights (click here). I don't recall if
I bought mine on ebay or through Amazon. But wiring up the Euro lights was not nearly as challenging as it seemed.
The pictures below show the connectors. However, the US model only needed one wire inserted to power the fog lights,
and I added one splice to illuminate an led ring that lit up the lower valence fog lights when the parking lights or headlights were on.
The OEM Euro Head Light Switch For VW Golf Jetta MK4 was easy to install. You pop it out, disconnect the connector, and connect the new switch. The only thing I changed was rerouting the DRL wire. You could also just remove that pin from the connector to disable DRL completely.
I added an aftermarket set of fog lights to the lower valence, the VW Bora Jetta Mk4 Lower Bumper H3 Fog Light Set with Relay, so when I installed the VW GOLF GTi JETTA 4 MKIV EURO SWITCH + WIRING ADAPTER WIRE FOR HEADLIGHTS
I rerouted the DRL setup to those lower fog lights, leaving the Euro fog lights in the HELLA 963660521 Volkswagen Jetta MkIV Headlight Combination Assembly for regular use via the EURO SWITCH and then used a SPDT or DPDT switch with center off so that I could run the lower fog lights as DRLs, or turn them off, or run them with the factory fog lights by applying power through the switch.
The lower valence fog lights I purchased had an led ring around the fog light portion, so I used a 3M Scotchlok Electrical IDC 560B-BOX, Double Run or Tap, Flame Retardant, Blue, 18-16 AWG (solid/stranded), 14 AWG (stranded (Pack of 100) to splice into the parking lamp (which goes to the city lights on the Euro lamp) and ran the wire to the ring on the foglights.
I was able to get the headlights out without removing the aftermarket skid plate, but did have to remove the front bumper. The factory skid plates are plastic and primarily reduce drag, and offer little protection against road debris or curbs or potholes. I've lost one oil pan by not having one. The heavy duty aluminum skid plates are outstanding, and a must have for your TDI.
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