This is probably a general auto radio question, but I am asking for a 97 Nissan PU. Is there a standard for automobile radio wiring? In other words, is the radio wiring standard on all make and model vehicles/radios? For example, there are three power wires, Red, Black, and Yellow. Is Black always ground, Red always switched (ignition) power , and Yellow always unswitched (battery) power? Likewise for the speaker pairs. Grey and Grey/Black stripe is always RF? Violet and Violet/Black stripe is always RR ? White and White/Black stripe is always LF ? Green and Green/Black stripe is always LR ?
I don't always use the conversion plugs, and didn't on my last radio installation in this vehicle, so I want to make sure I am placing the radio's unplugged wires into the car's plugs. I am matching the wires to the previous wiring job I did.