I'm kinda confused. Are you asking about the fog lights or Headlights?
When I installed... well exchanged the bulbs from stock to sylvaina silverstars I just replaced the bulbs which was pretty simple task that took me about 1 min. on each bulbs also no wiring harness was involved.
If your talking about Foglights then I don't know because I left them alone because I rather be able to see during actual foggy night.