Some dealerships use a "service department" power cable (so the customer's new cable stays clean and stowed). If your dealership did this, you could have a faulty power cable. One other possibility (if there's no power to anything in your trailer) is that your home outlet that you're plugging into is wired backwards and you're not getting power to the "hot side" of your trailer electrical breaker box....
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John
2015 F250 6.7l 4x4
2014 Cougar X Lite 27RKS
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