How should I wire my amplifier? (Continued)   You can also run the power wiring under panels, tracks, and carpet. But make sure your wires aren't running where a screw will go through them and cause a short. Never run power wire on the same side as the RCA wire. DC power wiring can cause induced signals to be applied to the signal as noise, pops, clicks, or alternator noise   Also plan to ground all additional components other than the head unit to the same point. This will prevent ground loop oscillations from presenting themselves.   If possible, use a screw or nut that's already in the vehicle. Unscrew it and take a scrapper or sand paper and clean paint and other things from the metal tell it is nice and shinny.   Don't forget to run the remote wire with the power wiring. It connects to the blue wire on most head units. Refer to your head units instructions for which wire to use to remotely turn your amplifier off and on via your head unit. I use crimp type closed end terminals to connect smaller wiring to the head unit,  amplifier, EQ., or electronic crossover, etc.

The Transformer
 
What does a ground loop isolator do?

It basically isolates the signal by using a transformer to pass the signal to the amp by effectively separating the signal into two distinctively separate circuits. Transformers are made of two conductivity separated coils, primary and secondary.  A one to one transformer has the same number of turns of wire for primary and secondary coils. Transformers basically transforms magnetic fields into relative AC voltages. The higher the amplitude of the magnetic fields the higher the relative voltages. There are two cycles to AC signals, one is the up wave or positive and the other a down wave or negative. When the up cycle of the wave presents itself to the primary side of the transformer, it causes a magnetic field to grow to the point of saturation then the field is at max for the input signal. During the process of switching between the up and down wave causes the collapse of the magnetic field and a voltage to be induced on the secondary winding of the transformer. So, rising and falling magnetic fields in the transformers produces an isolated signal to be produced on the secondary winding of the transformer exactly relative to the input on a one to one transformer.
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