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Noise in auto stereo

After reconnecting the ground wire to my 12v automotive digital stereo a buzzing noise appeared along with a drop in volume through the aux input but no other problems when playing cd's or listening to the fm radio

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Check all ground if still buzzing buy a noise filler

Posted on Oct 06, 2009


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Posted on Jan 02, 2017


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GM had bad stepper motors inside the instrument cluster,2003 to 2006 . These stepper motors control the gauge needles . Sounds like you have a few different problems . Instrument cluster has nothing to do with the A/C , radio , windows , locks . One possibility mite be that they all share a common ground . Do you know what wiring diagrams are ? How to read an use one ,along with a DVOM - digital volt ohm meter to test automotive electrical circuit's ?
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Multiple wires of the same color in factory stereo, 95 lesabre

Brian, first of all, make sure you have a multimeter and let's agree on one thing: any wire that has a switched voltage or a voltage to control antenna or motor has to be DC type of voltage, right? The other ones for the speakers are AC voltages as in music, right? Therefore, I would go with a meter between the wire and ground and measure on the DC scale and turn the radio on. Keep an eye on the meter and you will see that if the voltage appears, it is a DC voltage and it will answer your question. Hope it helps.

Dec 20, 2012 | 1995 Buick LeSabre

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I am needing a diagram on the stereo wires for a 1994 Dodge Stealth RT. The stereo was gone when I purchased the car and the moron prior to my owning it cut the wires at the plug. Can you help me.

General color code for most cars is:
Yellow constant 12v power
Red 12v power when ignition is on
black ground.

It would be best if you had or got a multimeter/volt meter (sears or radio shack). then check for 12v and 12v when ignition is on.

If the speaker wires are in sets of two find out which pair goes to each speaker is pretty easy. Check at each speaker the color of the wires.
If you can't get to the speaker - Get a 1.5v D battery and with each pair, strip each wire. when you hold one wire against the - side of the battery and tap the other wire to the + side the speaker will make a light popping noise.

Hope this helps

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The wiring harness. To the stereo has been cut. I need to install oem stereo and don't know where to start to find which wire hold the ground or power.

1998 Chevrolet Malibu Car Stereo Wiring Diagram

Car Radio Battery Constant 12v+ Wire: Orange
Car Radio Accessory Switched 12v+ Wire: Yellow
Car Radio Ground Wire: Black
Car Radio Illumination Wire: Gray
Car Stereo Dimmer Wire: Brown
Car Stereo Antenna Trigger Wire: Pink
Car Stereo Amp Trigger Wire: N/A
Car Stereo Amplifier Location: N/A
Car Audio Front Speakers Size: 4? x 6?
Car Audio Front Speakers Location: Doors
Left Front Speaker Positive Wire (+): Tan
Left Front Speaker Negative Wire (-): Gray
Right Front Speaker Positive Wire (+): Light Green
Right Front Speaker Negative Wire (-): Dark Green
Car Audio Rear Speakers Size: 6? x 9?
Car Audio Rear Speakers Location: Rear Deck
Left Rear Speaker Positive Wire (+): Brown
Left Rear Speaker Negative Wire (-): Yellow
Right Rear Speaker Positive Wire (+): Dark Blue
Right Rear Speaker Negative Wire (-): Light Blue

Hope this helps (remember to rate this).

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Humming/buzzing in aftermarket stereo when accelerating vehicle.

i once installed spark plug resistors (arrestors) that are supposed to help

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Car stereo pre-out signal noise

Two things, a ground loop isolator in-line with the RCA's between the head unit and the first amp.....also a noise reducing capacitor ( $5 or$6 at an auto parts store) on the alternator 12v post will reduce or remove the hum.

Mar 29, 2009 | Pioneer KEH-P3700 CD Changer

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Buzzing noise

check where your power and ground is coming from. for best results i would stay away from factory power and ground, i would run the power (+12v NOT the switched 12v) straight to the battery and ground the unit to a known good solid ground. what your hearing might be interference from lack of solid connections. if your running amplifiers make sure the power and ground are properly connected and grounded as well. you can also try ground loop isolators on the amplifiers white and red wires.

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