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I'm not sure if they are the same or not, but I had the same problem with a 2000 Ford Ranger. The fix given on another web site for the Ranger is to spray the door latch (in the hole on the edge of the open door that mates with the latch device on the door jamb) with WD40. If the Expedition system is like the Ranger, the light switch is in door latch & WD40 will fix it for a few months, at least. Hope this works.

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βˆ™ 2005-01-21 19:00:59
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Q: Why would the exterior and interior lights stay on in a 1999 Ford Expedition?
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