What year is your trailer? Normally, the problem is just the opposite. The top DOES NOT raise on AC power - period! The motor that lifts it is a 12V DC motor that receives its power directly from the battery.
Unless some former owner rewired and rebuilt it somehow, it should not work on AC power.
- Jack
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Hi-Lo 1707T - Tire Minder TPMS on Tow Vehicle and Trailer, 300W Solar Battery Charger, Equal-i-zer WDH, Progressive Dynamics Converter, Fan-Tastic Fan, LiFePO4 battery 12V DC Electrical System
2014 F150 Platinum 4x4 3.5L EcoBoost SCrew
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