Thanks for the help guru's
I think the common ground will be the problem. I asked my auto elec and he says he did try direct ground but did not disconnect the common ground at the time.
Peter, currently the blue/white wire is not connected because we dont know what to connect it to or where it goes to. We think it might be for the trip computer on the XR8 dash?
I'll let you know how things turn out. For now I am just going to get it registered as is.