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The most likely cause is heating and cooling from the sun causing tailgate wiring to flex while parked, or on bumpy roads This drove me crazy for a year. Also had flashing or flickering "door open" light at times while driving.

Lift the tailgate and carefully pull the plastic trim down across the top area of the glass, just enough to get to the two connectors inside. Separate the two connections and clean/lubricate the connections and reinstall.

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Q: Why does your 2003 mercury mountaineer keep going off for no reason?
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