First question is; has it ever worked?
Second, the only way to test the output with your F150 is with the trailer connected, and the truck running (it might even have to be in gear, I don’t recall). This is to prevent the trailer from draining the truck battery.
When I had my F150 it had the max tow package and there was nothing to set up, it just worked (and it worked very well). You cannot “boost” power output to the trailer because the auxiliary power wire in the truck and to the 7-pin plug is pretty small, and only permits a limited amount of amperage. That being said, if it was working at all, you would not only not drain the trailer batteries, but actually charge them while driving down the road.
I have heard of an empty slot in the under hood power center that doesn’t always come equipped with a fuse and if that is the case, it is an easy fix. Like I said, mine had it so I can’t tell you which one it is, and I don’t have that truck any longer. But you can google it and find plenty of links to guide you.
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Rob & Amy
2019 Passport 240BH SL (for sale)
2024 Cougar 29BHL (Taking delivery 5/11/24)
2022 Ford F250 7.3L Godzilla Crew Cab FX4
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