Never had to deal with replacing a stereo in one, so I can't tell you off the top of my head... what you need to do is get a test light and use that to determine which one has power. Once you establish which one has power, you keep the probe to the hot wire, and you can use the clip end of the test light to find ground by hooking it to the other wires until it lights up again.
http://www.modifiedlife.com/1998-ford-explorer-car-radio-stereo-wiring-diagram/ Color codes for factory wiring
http://www.modifiedlife.com/2003-hyundai-sonata-car-radio-stereo-audio-wiring-diagram/
Here is a link that gives numerous vehicle diagrams http://www.modifiedlife.com/2005-chrysler-300-car-stereo-wiring-diagram/
this is a tough one to answer without knowing more about it. is it a factory radio or an aftermarket? has it just started, or has it always made this buzzing? generally, buzzing occurs when someone's installed a new stereo, and/or amplifier & speakers, and either by lack of knowledge or lack of care, has either wired it up using existing wiring, or wired it up not realizing it's a corvette & the body isn't a good place to ground stereo equipment. 99 out of 100 buzzing noises on aftermarket setups happen because the installer failed to ground all components properly AND all components to the SAME point. this will cause a voltage potential difference between the battery & the power at the stereo/amp that will amplify that difference. if it's a factory unit, & someone has been working on the car at some point for something like adding a new alarm, or working on some controls either in the center console or the dash, they may have inadvertently disconnected the factory stereos ground wire. also, in both cases above, even if the stereo's ground is completely removed, the stereo will still work as long as the antenna is plugged into the stereo (because it will ground thru the antennas ground shield. again, this causes a difference in ground potential, and will cause an unbelieveable amount of noise.
Not too difficult. It will require about an hour and a basic understanding of car audio. This is not fully detailed, just the basics. You will need to purchase 2 things. 1. Vehicle Specific Mounting Kit (http://www.crutchfield.com/S-2G4tD0QgWhJ/m_750/Car-Stereo-Installation.html) 2. Vehicle Specific Wiring Harness (same website) The process goes like this: 1. Remove the factory stereo 2. Install the mounting kit which will include a little plastic compartment to fill in the extra space created by having a smaller-than-factory stereo. 3. Connect the wiring harness to the vehicle's existing harness. This should be compatible with your replacement stereo (make sure they are compatible) 4. Connect your new stereo to the harness (which goes between your new stereo and the vehicles current wiring harness) and slide the stereo into place. Done! Enjoy.
ground is the black...
The 2001 Toyota stereo wiring uses five different colors. The red wire will be for the positive wire. The black wire is the ground wire. The stereo speaker wires are yellow and green. The auxiliary wire is white.
Able stereo wiring diagram, for your Mazda, can be obtained from most Mazda dealerships. The wiring diagram will make wiring your stereo much easier.
The stereo wiring diagram for a Ford is a drawing showing the wiring placement for the stereo. The diagram will be different for various cars and trucks.
There are for stereo wiring color codes. The red wire is the positive wire. The black wire is a ground wire. The green wire is the speaker wire. The white wire is the auxiliary wire.
Black-ground red- antenna blue/white- turn on
The 1999 monster truck stereo wiring diagram can be obtained from most Mazda dealerships. The stereo has a wiring harness consisting of five wires.
color code of car stereo wiring
Connect the wiring harness to the back of your 1995 Buick LeSabre stereo. Secure the stereo with the stereo retaining screws.
A pioneer wiring diagram will show wiring placement for the installation of the stereo and the speakers. This diagram is included with the purchase of the stereo.
The Mazda stereo wiring consists of five different colors. The red wire is the positive wire. The black wire is the ground wire. The purple and yellow wires are the speaker wires. The white wire is the auxiliary wire.
You can get a Ford Fiesta stereo wiring diagram at a website called modifiedlife. It also lists all the wire colors for each component that is needed for wiring the stereo.