Can 2018 Ford F-150 Run Power From Battery Directly to 7-Way

Question:

Hello, I just learned my 2018 F-150 SuperCrew with tow package will not charge the trailer batteries while driving. The RV dealer checked the 7-pin Aux 12V and it showed no power. I spoke with a Ford service tech and he stated in order to have power the truck needed to be parked and you had to keep your foot on the brake pedal. He then hooked up a device that simulated a towed trailer and when the brake was not pressed there were zero amps at the 7-pin., but when the brake was pressed it showed 6-7 amp at the 7-pin. What are your thoughts on running a 16 gauge wire directly from the truck battery to the 7-pin Aux to have constant power to charge the towed trailer batteries? Thanks for your help!

asked by: Ed S

Expert Reply:

You can absolutely do that; in fact that's a pretty common thing because Ford's have that power issue to the 7-way like you said. Instead of 16 gauge wire though what you'll do is use 10 gauge wire # 10-1-1 as well as 40 amp In-Line Circuit Breaker # 9510 and run the wire from the positive battery terminal through the circuit breaker to the 12 volt pin of your F-150's 7-way.

expert reply by: Kyle S