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Try cleaning the contacts on the 7 way cable AND the receptacle in the truck bed.
We had intermittent messages "Connected", "Disconnected".
I used # 200 sand paper and "Deoxit" contact cleaner. For the female contacts I rolled up the sand paper. Once done I took a needle nose pliers and squeezed the female contacts a bit tighter.
We haven't had a problem since.
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Daryl and Marianne,
2019 3130re 20th Anniversary Edition
2016 F350 Lariat
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