After market stereo issues

[Chappie]

Hi, can anyone help please. I am trying to fit an aftermarket stereo in my a3 8p, but no matter which wiring harness I use from Halfords, the rear speakers do not work. I am told they are powered by a separate amp power supply. Has anyone been able to find a harness that will work as I don’t want to be splicing wires. 

[cliffcoggin]

If you bought the stereo from Halfords I suggest getting them to fit it, even if it costs a bit more. Let them have the problem of finding the right wires and connectors and fittings and screws and brackets.