Hi Guys, im new round here (from leeds in the uk) I have a 2000 model S3 and have been messing round with the HeadUnit etc. Its the bose fully amplified model. basicly i had taken the factory fit HU out and was messing with a new multiblock i had purchased and was hooking some RCA in plugs to go to the amp. anywas my new head unit worked fine so i took it out and left it for a day while i got one with some other stuff. when going back to finish the job nothing would power on. i could eject cds from the HU when the ignition was on but thats it. i disconnected it all and hooked up the fatory fit HU. this was dead. wouldnt do jack. on further inspection / testing with multimeter i notice the 12v perm live is no longer perm it just comes 12v when the ignition comes on ??!?! i checked all fuses etc and cant find any blown. i made sure i didnt touch the standard audi plugs and only changed things on the harness i purchased.. im lost. can anyone help?