man, i tried the h4 high beam this with the rrelays but it wouldnt work. I would just get constant high beams off thte H4. I dunno if it was the realy that was wrong or what but everything was wired right, it just didnt work. Only bad thing about the depo's is the way the light bulbs go in them. They are a ***** to remove and change for the frist time. afterwards you get used to it but if you unscrew that screw all the way, which usually happens, you're kinda screwed. Luckly the metal attaching arm will still lock into place somehow, but not as god as it prolly could be