I have a 2007 Ford Focus with the stock radio I put a aftermarket radio in the car and cut the harness and spliced in the harness from the aftermarket radio but the aftermarket radio I got was complete crap so I bout the OEM HARNESS to wire back up the the harness I cut so I could put the OEM radio back in and it work fine but the illumination wire has no power at all now even with lights on so in the dark I can’t see the buttons on the radio the only thing that lights up it the screen how can I fix this !!!!!!