I have a 2005 pontiac grand am and cant seem to hook it up. the wire installation kit that advance auto parts sold me Metra autoworks stereo wire harness. the wire harness number is AT-WHGM3. The clarion...
Ok, relax. The purpose of the harness is to wire you radio to it, then be able to plug into the factory harness without cutting wires. Let's start from scratch. The harness you have should have all the wires you need IF you told the retailer all the specifications of your vehicle. Basically the harness should have a positive, negative, switched power, and speakers (4 sets). Speaker wires are generally grey, green, white, and purple. Constant power is red, switched power is yellow, and ground is black. However, you unit may have other wires coming off of it, such as remote turn on (usually blue), RCA outputs, and will have an antenna jack that you may need an adaptor for. Sometimes factory harnesses have two plugs. Sometimes they are not required for the radio to be functional (it may be the output and return for an external amplifier that you are currently bypassing). So follow the instructions on the package. Don't feel like you have to be stuck in your car to hook your radio to the harness either. Hope this helps.
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