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I don't think any of the Ford stock stereos have a security feature when you remove the power. Maybe check the fuse and make sure the harness is pluged in tight.
I wasn't aware of any of the US models doing it either, but after I disconnected power to it (checking fuses, etc), it locked up! oh well, I'm going to transfer my other stereo over in a few weeks anyway. Thanks
This Hennessey Takes the Expedition Tremor's Off-Roading Capability to the Next Level
Slideshow: The VelociRaptor Expedition gains a lift, upgraded suspension, Brembo brakes, and trail-ready equipment while retaining the stock 440-horsepower EcoBoost V6.
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