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It's posible somewhere a wire was crossed that should only see ignition voltage (12v only when the ignition is on). If this was crossed with a 12v constant, it could be running through the entire wire harness to anything connected to it, or activating a relay that's normally off.
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even though you did nothing behind the dash, the wire harness runs throughout the entire car like a highway system. A bad connection anywhere could affect other parts of the car.
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