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Question:

How to install an aftermarket radio in my 2007 single cab 2wd Colorado, With Out a wiring harness?

I accidentally cut the stock wire harness piece out thinking, that i would just strip the wires and twist them in witht the coenciding colors to my Aftermarket radio, then none of the wires matched. And now all i see is to use a wire harness but that option is out since i cut the wires free from the small harness plug thing that was origanally attactched. any help would greatly be appreciated.

Answer:

you have to find a wiring diagram for your car and the wiring diagram for the radio you want to put in .
You are going to need a multimeter Set it to 12 volts dc ( probably will be 20V, which works for this.) Ground the negative cable on the meter, to a secure ground. I like to stick it in the ignition, myself. DO NOT strip any wires at all, you can stick the point of the meter in just to make contact and get a reading without exposing any Hot wires. Slowly check each wire for 12 volts. ( if none read that, check your fuse box) that will be your constant 12v, or yellow. Then reground the meter, insert ket, turn to acc, then re meter all of the lines, looking for 12v again ( for red/switched +12v on the harness.) After finding that, switch it to Ohms, or the horseshoe looking one. Pick a wire as a starting point, and stick the other end of the meter in until it either reads a number, possible 2 - 8, and that's a speaker ( I would also write all of the colors down for this) And keep repeating until you fine all 2 to 4 plus speakers. Having cut the plug can also have done excessive damage, like to Onstar, if installed, or any security system also. using metal cutters, cutting through power/ground/speaker/ and other wires all at once, and sometimes be catastrophic to vehicles, seeing how much technology is in them. I hope the best for you, and next time, pony up for ther harness ;) Good Luck! P.S. if that seems too much to do, a hardwire goes for a couple hundred from a shop, as pure labor. just as a heads up.

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