There is no official "standard" for audio systems. As long as you stay consistent throughout the system, it will work properly. It is a little known fact that most electrons are color-blind :-) Note that neither wire on a speaker output may actually be grounded, but it is understood that when we refer to ground, common, or negative - all refer to the same terminal on an amplifier's outpput. There are a few combinations that are seen a lot. While these have no basis in any published standard that I know of, you could use one of the following: * 'zip' cord with gold and silver colored conductors - silver is common. * Solid color zip cord with a colored stripe on one side - stripe is common. * Solid color zip with a raised rib you can feel on one side - rib is common. * Jacketed cable, any color plus black - black is common. * Jacketed cable, red plus any color, red is positive - other color is common. * Jacketed cable, neither red nor black - lighter color is positive, darker color is common. Zip cord is also known as lamp cord. Oh, if you are wiring a multi-output auto stereo with dozens of oddly colored wires in a factory harness, all bets are off. Consult the manufacturer's install sheet for the correct info, as colors vary among manufacturers.
The chasis is the ground. There is no wire.
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.
The red wire is the hot wire. The black wire is the ground wire. The green wire is the speaker wire. The white wire is the auxiliary wire.
The red wire is the positive wire. The black wire is the ground wire. The green wire is speaker wire. The white wire is the auxiliary wire.
The positive speaker wire is a solid color, your negative wire should have a stripe on it.
The stereo wiring color code for a 1991 to 1995 Toyota Tercel is as follows: the right front speaker (+) is green. The left front speaker wire (+) is pink. The 12v+ ignition wire is gray and the 12v+ battery wire is blue with a yellow stripe. The right front speaker wire (-) is blue, and the left front speaker (-) is purple. The ground wire is black. The right rear speaker wire (+) is red, the left rear speaker (+) is black, the right rear speaker (-) is white, and the left rear speaker (-) is yellow.
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Most will say that the white striped wire is the ground. The bottom line is that it doesn't really make a difference as long as your amp ground goes to your speaker ground. This is very important!
The black wire is the ground wire. The red wire is the positive wire. The green and yellow wires are the speaker wires. The white wire is the auxiliary wire.
The red wire is the positive wire. The yellow and green wires are the speaker wires. The brown or black wire is the ground wire. The white wire is and auxiliary wire.
The audio red wire is the positive wire. The black or brown wire is the ground wire. The green and yellow wires are the speaker wires. The white wire is the auxiliary wire.
The car stereo wiring color codes for a 1986 BMW 528e are easy to follow. The radio switched 12V+ wire is purple, the ground wire is brown. For the front speakers, the left front speaker wire (+) is yellow/red, the left front speaker wire (-) is yellow/brown, the right front speaker wire (+) is blue/red, and the right front speaker wire (-) is blue/brown. For the rear speakers, the left rear speaker wire (+) is yellow/blue, the left rear speaker wire (-) is yellow/gray, the right rear speaker wire (+) is blue/purple, and the right rear speaker wire (-) is blue/gray.