Hi and Welcome to FRF!
Your trailer 7-pin cable should provide a charge from your tow vehicle IF you have your truck enabled to provide a charge. Sometimes a fuse or relay needs to be installed. You need to check your truck's 7-pin outlet and see if that pin is working.
Be aware that most tow vehicles only provide a trickle charge at best.
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Dan-Retired California Firefighter/EMT
Shawn-Musician/Entrepreneur/Wine Expert
and Zoe the Wonder Dog(R.I.P.)
2016 PrimeTime TracerAIR 255, pushing a 2014 Ford F150 SCREW XTR 4x4 3.5 Ecoboost w/Max Tow Package
4pt Equal-i-zer WDH and 1828lbs of payload capacity
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