Compass stuck in "SOUTH" position
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never had the problem on the F150, but the Explorer does this once every 6 months. In the owners manual it said there is a pin hole next to the compass. you push a pin thru the hole, gauge starts blinking, then you drive around in a circle in a parking lot about 3 revolutions and it is "set". not sure on the F150, but probablyl says something similar in the book. Is this how you are resetting?