I have a 2005 SSC with the ponder system and no OnStar, I'm trying to wire in an aftermarket deck. I have the dash kit and 24pin harness adapter, I'm wondering what wires connect to my new radios harness and how I get power to the amp. I can put pictures of the harness up if required. Thanks

 

there should be instructions with the harness.... but you would need to post pics and or give the model number of the radio and harness for us to help you here

 

I'll post pictures and the model number of the stereo is Panasonic CQ-RX400U.