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Not too sure how its wired in an Expedition, but first off check for a blown fuse. If all are good check the connections on the back of the outlet. If you have a voltmeter see if you are getting 12v on the wire attatched to the center of the outlet. If so, check for continuity between the other wire and ground(any metal under the dash should do). Let me know how you make out.
Anyone know how to get the 12v outlets to switch on and off with the key. If not what is the best place to wire in a radar detector to switch on and off with the key.
Rezvani's Latest Post-Apocalyptic Monster Is a Ford F-150 Raptor Underneath
Slideshow: Called the Fortress, the 850-horsepower pickup combines Raptor underpinnings with military-inspired features, survival equipment, and a starting price of $285,000.