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There are 3 fuses in the interior fuse panel that feeds radio.
no. 11(10amp) is ignition switch power to the radio it comes into radio on the TN/LB wire.
no. 27 (10amp) is hot at all times and comes in on OG/LG wire.
no. 12 (5amp) is hot in run or accessory and comes in on YE/BK wire.
Check these with 12V test light at fuse and at radio connector.
What won't come on? Is this a radio that won't come on or an amplifier? If it is a radio not turning on, check all radio fuses (both at fuse panel and under hood). If these are all good and the radio still doesn't turn on, then you'll need to remove the radio and check power behind it. If you have an amplifier that isn't turning on, you need to first check power on the fused power wire coming from the battery. You can use a 12 volt test light (available from an auto parts store) to check for power at the amplifier power connections. Test the 12v constant power and then the 12v remote turn-on power. If either of these are out, check fuses on the main and make sure the radio is delivering 12 remote turn-on power. If you are still having difficulty, please see a professional car stereo shop. They will be able to diagnose the problem usually in less than 1 hour for a small troubleshooting fee. Hope this was helpful.