Perhaps the electrical gurus can help. I wired up my VTEC light correctly but it doesn't work. I think the problem lies in the grounding location -- I grounded it to a metal bracket near the strut tower brace. Is this a good place?
Haha...then maybe you didn't wire it correctly ehh?
Well, first things first, always have a multimeter when doing electrical work. Set it to test you ground and do just that. Then you'll know if the ground is good or not. You can get a multimeter at radio shack and any other store like that.
As for were to tap it into...no clue. I've never installed a light for that.