ANSWERS: 2
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When you soldered the wires together, was the "in-line" fuse still installed? You might have burned the fuse up.
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The factory radio harness does not have a acc+ line. You have to be mor creative. Google for a place called ImpalaHQ. There is a power drop that has a Iginition controlled + and a Constant + and a Ground to it. You will have to run the wires there for proper ignition operation. The factory radio turns on and off from a signal sent by databus from the computers in the car. Not from a Ignition voltage. That is what allows the factory radio to stay on after the car has been cut off. P.S. the power drop is fused with 15amps.
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