I bought a Ipod connector (the Connects 2 one CTAADIPOD003) after installing it it works fine but when I am driving it creates and electric whine, the pitch gets higher the faster I drive. I thought it was a grounding issue, ive checked where I was grounding it and it all seems fine (grounding to the icon that looks like an upturned tree on the wiring diagram) I have a 98 A4 2.8 with I believe the concert 2 (tape player, cd changer in boot no amp / sub.
the back of the stereo is exactly the same as a previous post Upgrading from Bose in 8L S3
tried moving the lead from the Connects 2 box to the ipod from the drivers side to the passengers, but again didnt seem to solve anything.
am I missing something stupid?