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Truckdoc,
Is the problem only when you are towing? More than likely it's in the wireing. I've had the same problem three times in my 06 F250. Once it was in the add on female plug, in the pickup bed. Another time it was a loose wire under the trailer. The last time I couldn't find it myself and took the rig to our local dealer. They found two bad magnets in the trailer wheels.
Good Luck,
Jerry
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