I'm not sure. I'm not really familiar with the CA tail light. That's why I asked for the pics. I'll have a better chance at bein able to help you out once you get those up tomorrow. And if I can't help you out, I'm sure someone on here has installed that light before and can help you out. Also, put a picture up on here about how they want the relay wired. I know you said it's common sense stuff, but we've all made mistakes before. Maybe it's something simple. Who knows, but I really need the pics to see exactly what you're talkin about.