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On most radios there is an additional wire called "keyed power" or "switched power" or something similar. That needs to be connected to the accessories circuit (if you want the radio to turn off when you turn the car off), or to 12v power (if you want the radio to stay on when the key is turned off).

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Q: When you connect your new radio to the 12v wire and ground it correctly you still get no power what could be the problem in a 90 Buick Lesabre?
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