Start with replacing the bulb and make sure the grounds are good. It's a problem that can happen to any brand not just a Ford. My Chevy pickup did it and it was a bulb. I've also seen the wrong bulb being installed can cause the problem.
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05 FX4 Extra Cab
2010 Edge SEL all wheel drive
71 Chevy Impala Sport Coupe
69 Camaro SS 350 Coupe
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