Fangrui Product Details Add A Amplifier Plug Play Harness Fits For Forvc Factory Radio. This Is An Part. With Quality Control And Testing. This Wire Harness Provides A Line Out Converter For Connection To One Set Of Cables To Provide An Audio Signal To An External Amplifier. Also Pre-installed On The Harness Is A Remote Amplifier Turn On Wire. This Wire, Along With A Set Of Cables, Is Run To Your Amplifier. All Thats Left To Do Is Connect Your Own Main Power Wire From Your Battery And A Ground. Instruction Not Included. Converter Adjustment Instructions: After Completing All Of The Necessary Connections, Turn The Adjustment Pots All Of The Way Down By Rotating Them Completely Counter-clockwise. Turn The Stereo System On And Adjust The Main Volume Control On The Stereo To Approximately 3/4 Maximum Volume. Select One Of The Adjustment Pots And Turn It Slowly Clockwise Notice Audio Distortion And Then Stop. Turn The Remaining Pot To The Same Position As The Previously Adjusted Pot. Compatibility Notes: Audio Volume To The Ampl