your problem. You may have a burnt fuse on the either of the two power wires. Try with the key off to see if the radio will come on when you connect both radio wires to the (Z) yellow wire. If it doesn't come on then the yellow is dead. If it does then hook both radio wires to the (Z) blue wire and turn on the ignition to see if the radio comes on. If it doesn't then the blue is dead. Or you can save all the hassle and get a 3$ test light from autozone
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