I recently purchased a set of Projector Headlights from APC and they came with no diagram for install. Has anyone out there installed these that could tell me where I can get a wiring diagram or give me some pointers on how to wire them properly? Should the projectors be wired so they only come on if parking lights are on or only when the headlights are on, or does it not matter? Is that what the relay is for? Any help would be appreciated. Thanks!