you have to make sure ALL the fuses are not blown. The fuse labeled 'Radio' is usually a 12v ignition source. You can verify by using a volt meter, turn the car on, find a 12v wire and turn the key off and see if the 12 volts is lost. Most cars have the constant 12v fuse for the radio connected to a different source and labeled something else- like interior lights. If you still are lost run a wire directly from the battery(fused) and find a 12 volt source that only has 12 volts when the key is on or, if you do not care just connect the wire from the battery to the constant and ignition wire on the back of your radio. You'll just have to remember to turn you radio off when you leave your car.
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