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Allow me to look up the wiring diagrams to see if there is a separate circuit or fuse. I need to know some more information first. Which engine is in this, the 5.4 or 4.6?
I found these fuses, all in the central junction box, fuses 4, 7, 22 and 31. 4 and 31 should be hot all the time and 7 hot with the key on start, so I don't think it would be that one and 22 hot with the accessory delay relay energized.
Yeah, especially if the key was left in the ignition.
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No, I would not add or remove a fuse with the key on but you can try removing the fuse and putting it back in with the key off. Them fuses 4 and 31 are supposed to be hot all the time anyhow. So, to answer your first question you could test both sides of each fuse when it is supposed to be hot with a voltmeter or 12 volt test light. You may also want to check the interior light fuses cause I seen a mention of the interior lights in the wiring diagram.
That would be fuse 6 in the central junction box, hot all the time.
Here are the wiring diagrams, if all the fuses are ok, I do see any audio on connection to the cd player from the radio, so it may be a problem with the power from the radio itself,
I don't know what else to think. Did the dealer try to retrieve any codes from the vehicle?