Hey fellas, I think I found the original radio harness with 3 wires. Yellow (power), Black(ground) and a grey wire???. Anyone know what the grey wire would be for? Thanks guys

 

I just had this problem today. The gray wire is the radio illumination wire. If you look on the rear of the bezel all of the lights have gray wires. I noticed that after I traced the wire with the diagram in the production Assembly manual.