My guess would be the illumination wire (the wire that tells your deck to dim a little when you turn your headlights on). Your deck probably isn't compatible with it. Try cutting that wire or just remove it form the connector and tape it off to see if it cures the problem. If it does, either heatshrink/tape it off, or remove it from the harness all together (preferred method).
Also, never replace a fuse with one that has a higher rating (like you did replacing a 10 amp fuse with a 15 amp one). That's almost a sure fire way to ruin something, or burn your car to the ground. Yeah, it's that serious.
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