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I think crutchfield used to sell a wrap you could put around power wires to reduce the interference. If you have a ton of extra wire route it as far away as possible from the radio, antenna, speaker wires, and amp wiring. If you run it alongside any of them it picks up the interference. Then get rid of any extra wire length and solder the connections.
Might want to call a couple car audio install shops and see what they have.
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