Valentine One with Invisicord

I have a valentine one that I am installing with a blendmount and an invisicord, the only thing is, my 2004 auto dimming mirror has 3 wires. Red, White/black stripe and Black. When I plug it into the red and white/black strip, it works, the only problem is the power is constant and does not turn off with the car. When I try to use the red wire and the black wire, nothing works, I guess cause it is not ground. Anyone have any ideas what to do about this? Can I be missing something? Its only 3 wires hah.