Anyone try to test there 7 way plug with 5th wheel prep package? All pins check good power, except 12 volts charging pin (trailer charge). That’s checking at 5th wheel receptacle in box and rear bumper receptacle. No power from 12 volt pin.

Manual says a trailer has to be connected to truck and then touch the brakes to activate 12 volts power at 7 way receptacle. Anyone else try and check the 12 volt power?

 

It is some new "smart" power system that only supplies power when a trailer is connected, engine running and brake has been applied. If you haven't done those steps... then there is no power.

 

As stated and I verified at the RV dealer. I got it to work by tapping the brake, others have said turning the lights on will work as well.

 

If you can find the trailer tow module you could easily jumper power so you have it full time.

 

I just had the wife turn on lights and hold down the brake pedal, and no power to the 12 + pin. Maybe it’s wired wrong or something. I’m baffled.

 

How are you checking it? It has to be connected to work, in other words you cant test it by putting a tester on the pin and hitting the brake, the trailer has to be plugged in, if thats what you are doing that is..

 

Wish it was turned on by unliffter switch. Guess I need to get an 7 way tester with trailer emulator. I would think Ford could test it?

 

Thats how I tested mine, they had a box that simulated a trailer, no power at hookup, tap the brake I had power. It will work, dont sweat it.

 

Mine only seems to work when it is taken out of park.

 

Try activating the electric brake controller

 

I'm following this thread to see what happens , I was at the rv dealer and was told my truck wouldn't charge , then the ford dealer tested it and told me there is a change in these new trucks that would not charge unless plugged in to the trailer . So all this is now comming back to me I was left thinking about it because it didn't seem right that the tester at the dealer couldn't read charge, however I do understand that today's technology is getting more and more "smart" and we are getting more and more ...well.. .. I would like one of the upfitter switches that aren't Realy doing anything be able to manually charge the rig would be nice . But I guess this truck is smarter than I, so I don't have to do that just let the truck do it for me.

 

IF you would like to make the wire always hot, please follow these instructions, under the section marked "additional instructions"

There is a trailer command box in the drivers footwell, and you can activate the relay to always on.

 

 

https://www.ford-trucks.com/forums/1...-location.html

I had the same question early last year.
Mine worked fine after hook and applying brakes.
I just used a volt meter on the trailer batteries. 12v unhooked and after plugging in, starting and applying brakes it tested almost 14v so I knew the charge circuit was working