I have a 95 range rover, I want to install my deck and use the factory amps and speakers. I found out that the previous owner just ran new speaker wire right from the deck to each door lower speaker. He unplugged all the other speakers.

I plugged all the speakers back in and tried hooking the deck up to the factory wiring and nothing is coming out of the speakers. Also the rear sub is gone and the plug is just laying there unplugged. So what do I need to do to hook up the deck to the factory harness and use all the speakers.

I checked both fuses and they are good and on both rear door amps I have power at the purple wire with the ignition off.

 

I think you tried everything I could think of. I suggest you to consult your mechanic .