To get mine to work reliably, I had to run a harness directly from the battery and they fired up every time. That was with a dem kit. I have since went back stock until I do a proper retrofit, it was more for testing purposes. You could try a cabbie kit maybe from trs and you may not need to run power from the battery, I haven't tested that yet.
Pretty much what happens is, HIDs run at lower power than halogens, but to turn them on or trigger them, it takes a little more initial power than stock lights. So the relay pulls from the battery to help with triggering them on.
2012 Jetta SE with Conv. and Sunroof
But that's neither here nor there. If you want really bright fogs, projectors are the way to go, even if they use halogens.
Never, ever put HIDs in foglamps. Ever wonder why absolutely ZERO OEM manufacturers have HID fogs? Im talking $100k Mercedes, $300k Ferrari etc. Nobody does it. Ever consider why?
HID is inherently unsuitable for foglights, and you are creating INSANE amounts of glare for all other drivers around you, especially in the rain. Talk about a dick move. Stick with halogen, and the lower color temperature the better....unless you really are going for the "Hey everyone look at me, I have a $30 set of TOTALLY COOL blue ebay HIDs...glaring your brains out"
2012 GLI | 2005 WRX | 2006 DAYTONA 675