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The switch that controls the interior lights is in the door latch not the A post and it gets gummed up with stuff causing the switch to indicate open even when the door is closed. Take the WD-40 and spray it in the latch, don't be stingy-some people have had to shoot so much in that it runs out the weep holes at the bottom of the door. After it is juiced up open and close the doors half a dozen times.

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โˆ™ 2005-02-06 14:36:39
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Q: Why would a 1999 F150 cargo and interior light stay on and the door ajar light on the dash stay on occasionally?
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