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Your ford may be different. But I had a bad "relay" that would turn my trailer lights on and off, and show disconnect on my last Ford. It was hard to find, but after $1000.00 trouble shooting, a guy on a web site, told me about the issue. It's a trailer lights/towing relay. Mine was under dash, but some years were located in engine compartment. Ford dealer never heard of it before I told them. The problem showed up after about 10 miles, then lights would go dark, and acted like it was not plugged in at pigtail.
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