Changing from 4 pin to 7 pin

Hello All
Need some advice please
My truck is 7 pin, my trailer is a 4 pin. Want to change trailer to 7 pin
Presently there is no set up to charge the trailer battery from the truck while driving
Trailer has a WFCO Inverter with a 12v battery
The hot wire (+) from the truck 7 pin connects where ???
To the battery or to the WFCO Inverter

Thanks
mike

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