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Okay, I have a 2009 Chevy cobalt with onstar if that matters that I’m switching to an aftermarket radio. I used an aftermarket radio harness for it. When I connected all the wires, no power. I connect the constant and the ignition wire (red&yellow) I have power to the radio but then my cluster won’t function correctly, I also have no sound at though the speakers. What do I need to do to get power as well as sound?
 

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Usually using the Metra LC-GMRC-LAN-03 takes care of the installation of aftermarket stereos. Do you have the Pioneer stereo with the amplifier in the trunk. If so, you may need to do some different things to get it to work.
 
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