If you experience alternator and ignition noise with your installed aftermarket iPod, AUX-In, USB, or any other adapters - you will need this filter.
The C-GNF12 12 Amp noise filter supresses Alternator and Ignition Noise.
This noise filter helps buffer rapid transient power drops.
Power Line Noise Filter connects to the power line of the receiver and helps reduce noise from the source.
Download the installation instructions in .pdf format here >>>
Noise filter- 12 amp power line