So I have a 2005 Jaguar XJ8 L, and I’m I stalking a navigation cd radio unit and taking ou the basic unit they have in it. Everything was good until down on the passenger side in front of the gearbox and kinda under the ashtray there’s a big grey plug on the harness that’s on the car has a bunch of wires running in it but on the wire harness for the nav unit only has one wire running into it and won’t power the u it just light up the CD player part. Can someone please help me as to what steps do I need to take with this matter.