My A4 had a Audi Chorus system stock in it. When i bought the car it had somekind of crappy player in it, so i bought a new Kendwood player for it. Rear speakers were working fine when it had the audi chorus player in it but when the shitty aftermarket player were swapped instead rear speakers stopped working, and the new player's memory kept resetting. I swapped the new kenwood to it and the new player had the same problems. I've found out that i might need some kind of adapters to get the rear speakers working, so i have couple questions:

1) What kind of adapters i need and how do i install them?

2) What wire i need to connect and where to to prevent my player from resetting its memory every time i take the key out?

Also; i haven't found a audio wire diagrams for my car. If somebody could provide me a list of wire colors etc. it would be helpfull.