2000 eclipse stereo - no radio display
 

Hi,

My OEM stereo was playing fine. I purchased an after market stereo which played fine but not an overall improvement over the my stock unit so I took it back for a refund. When I re-installed my original Infinity unit now I have a display (no radio), can load a CD but will not play CD. The cigarette lighter works as though. The small 8-pin connector with 4 wires supposedly controls the display pod. The is no voltage reading from the ground/red wire...should there be 12 volts there?

What am I missing? What to do?

Thanks in advance.