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Buy a wiring harness - simply plugs into the stock harness plug and then gives you the wires clearly marked out. That way, you don't wreck the connector in the car, and you can swap with another HU later (or even put the stocker back in).

Besides, it's a pain in the butt to work on the wiring in the car - the harness lets you build it all up inside the house, so you just plug it into the car later.

Of course, if some idiot cut the connector already, then you probably can't use this advice. In which case, I advise searching here and at Probetalk.com as I am sure the answer is already posted.
 

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Here's another one....

Car:...........Aftermarket Radio:.............Function
blue/white......red.....................................+12V ignition [switched]
blue/red..........yellow................................+12V battery [constant]
orange............orange...............................+12V headlight switched [for dimmer function]
red/green........blue/white.........................+12V remote/power antenna lead
blue/green......white.................................Left Front Speaker (+)
blue/black.......gray..................................Right Front Speaker (+)
blue................white/black.......................Left Front Speaker (-)
blue/orange....gray/black.........................Right Front Speaker (-)
green/black.....green...............................Left Rear Speaker (+)
green/orange..green/black......................Left Rear Speaker (-)
yellow/green....purple.............................Right Rear Speaker (+) <---may have been green/yellow hard to tell
green..............purlple/black......................Right Rear Speaker (-)
 
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