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How long after you replace the fuse does it blow? How long have you left the deck unplugged to verify it doesn't blow when its unplugged? You're not going to get any "high" voltages. If it truly does it only when the decks connected, I would inspect the illumination wire looking for any nicks or cuts including the tape that you put on there. The only thing that blows a fuse is overcurrent. More than likely by grounding out. If your headunit was blowing 15a fuses, whatever was wrong with it would be obvious.
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