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What is Alternator Noise? What you are experiencing is most likely alternator noise, the power to your outlet is not cleaned up as it is for the stereo so the sound is transmitted through the power cord and out through the audio out jack to be amplified by the stereo. By installing a noise filter or the much cheaper "capacitor" on the power wire that is connected to the outlet you can eliminate the problem, a stereo store can sell you a noise filter and radio shack can sell you the capacitor. its an easy do it yourself. heres an explanation of alternator noise Alternator noise is a high pitched whine caused by the car's electrical system. When the engine spins the alternator around, the alternator induces an AC voltage that is converted to DC and used to charge the car's electrical system. It acts pretty much as an inverted electric motor (motion is put in, and voltage comes out). The problem is that a small amount of AC voltage remains in the system. Frequencies change accordingly to the engine's RPMs. If the engine spins faster, noise frequency is higher. That is why you would hear alternator noise coming from mids and tweeters, but not subwoofers, since subwoofers only play low frequencies. What causes it? well when a wire has current through it, a magnetic field circles around it. Conversely, if there is a magnetic field perpendicular to a wire, current will be induced. If you have your RCA wires going from the radio or equalizer to the amp running in parallel to your power wires, an AC current will be induced and added to the sound signal. The sound signal travelling to the amp is a low voltage signal (in the mV range - thousands of a volt). The induced signal will be amplified along with the music. Avoiding this problem is very simple: DON'T run power and RCA wires together. If there are points in which they do have to cross, try to place them perpendicular to each other. Run the power wire from the battery to the amp on one side of the car, and the RCA wires along the other side of the car. On most cars it is better to run RCA's on the passenger's side, and power wires on the driver's side. Note that noise may be also be induced by factory harnesses, car computers and other electronic equipment

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Q: How do you stop a ground noise when listening to your Ipod when it is on the vehicle power supply 92 legacy?
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