alpine era-g20 digital eq

The ground wire can be grounded there in the trunk. I dont know what kind of car you have but Im sure there is a bolt or screw of some kind you could use there. Be sure to grind off the paint where it makes contact. As far as the 12v power wire , you probly need to run a single wire for that to the front of the car to a 12v sorce. Maybe the cig. lighter , fuse block , the head unit.....ect.ect. Is there a remote turn on for that unit ? If so you will need to run a wire for that as well.