How To Activate 12V Trailer Charge Circuit On 2019 Ford Super Duty With Factory 7-Way

Question

Question:

I have installed the 30 amp fuse to the number 27 spot for charging trailer battery but am not getting any power to the plug.And I have a factory installed brake control inside the cab and my truck is a 2019 F350 super duty

asked by: Dewayne

0

Expert Reply:

If you have already added the fuse and the trailer charge circuit is not activated in the 2019 Ford F-350 Super Duty with factory integrated brake controller, then you want to make sure the trailer is connected and you press the brake according to a Ford Service Bulletin on their factory integrated brake control with trailer module 12V charging system.

There may also be a dash setting to activate the tow/haul mode on the 7-way before the 12V output is activated.

expert reply by: Heather A

0

Mike M.

7/4/2020

I also am having issue's with the charging system in my 2019 F350. Replaced the fuse #27 that wasn't blown and it still did not work. I have power to the fuse. I have replaced fuse#65 it was blown. This also didn't fix the problem. Fuse #42 a 40 amp fuse could be the issue. But everything else with the 5th wheel I pull is working. Also I do not find a setting that you have to turn on, to get the battery to charge in your trailer.

Chris R.

7/8/2020

Newer Ford trucks (including your 2019 F-350) require that a trailer is hooked up and the brake pedal is depressed before the 12V circuit becomes active. So try connecting the trailer and tapping on the brake pedal, then test the 12V pin on the 7-way to see if you get power.

James B.

7/15/2020

What happens if you are trying to hook up your truck camper.

Chris R.

7/20/2020

The process would be the same since the truck camper will still be plugging into the factory trailer harness when attached.

Tom I.

8/4/2020

I have a 2020 F 150 and mine isn't charging also. Can you tell me what pins I check?

Chris R.

8/13/2020

The 12V pin on the 7-Way is the one located in the 1 o'clock position. On your 2020 F-150 there's a 25 amp fuse located in the # 30 spot inside the under-hood fuse box that's in charge of this circuit. Check this fuse to make sure it's present and in good condition.

Sam

1/16/2026

@ChrisR #30 is the 4x4 module in a 209 Super Duty

Sam

1/16/2026

2019 Super Duty

Brian

9/5/2020

I too have a new 2020 f350 with an accessory pin that won't activate. even after selecting a trailer and depressing the brake and confirming that a trailer is detected there's no accessory voltage.. I may just have it wired to an upfitter switch and just avoid the whole mess

Jon G.

9/8/2020

You could go that route if you wanted to. The only other thing I can think of doing (if you've verified it has the fuse and no power to that specific pin) is to physically trace that wire as much as you can to see if there are any places that have breaks or any damage.

Ronald S.

11/8/2020

@Brian They key fob must be in vehicle and doors closed, for my 12v trailer jack to get power. So I can lower trailer tongue onto ball. We almost did not make it to work. trying to figure this out. this is not a desired feature, at all. :(

Tom E.

11/18/2021

I have a 2021 F250, it only charges my slide in camper in tow haul mode. It is a light camper and I don't always use that mode, so I had a few dead battery moments before figuring it out.

Answer 1

The wiring on your 2019 Ford F-250 Super Duty is a little goofy and it's something that a LOT of people have complained about with the newer Ford pickups. To get power back to your trailer jack you'll have to close your driver's door,…

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Answer 2

Since you are not getting the 12V power when your truck is running, you most likely don't have a fuse issue as you stated their isn't a specified fuse or relay in the owners manual. The issue is that your truck is computerized even at the…

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Answer 3

Hey Larry, For a 2019 Ford F-250 we have the Draw-Tite Front Mount Trailer Hitch Receiver #65076 and the EcoHitch Hidden Front Mount Trailer Hitch Receiver #306-X7904. Aside from price the major differentiator here is where the receiver tube is going…

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Answer 4

It doesn't work the way you think it does so that's probably why you think there is an issue. The circuit is usually only powered while traveling down the road and gear shifting takes place. The only way to get around this is to run a power…

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Answer 5

The power to the 12 volt pin on the 7-way of new Ford trucks like your 2019 Ford F-250 is unfortunately a common struggle so you're definitely not alone but thankfully there is a pretty simple solution. All you need to do is run your own 10 gauge…

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Answer 6

Assuming that wire you found is a 12 volt circuit that is fuse protected like you mentioned you certainly could use it to charge the tow vehicle with the #RM-156-75. You should note that the charge circuit of a 7-way is actually the 1:00 pin of the…

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Answer 7

The best solution as you alluded to is to bypass the factory "Smart Tow" trailer package which is what is responsible for only sending power to the 12 volt pin when the vehicle is in gear. This is actually pretty easy to do and we have a…

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Answer 8

Personally I wouldn't go with Timbren's for your needs. They're essentially rubber bump stops that prevent your suspension from flexing when weights placed on the rear of your Canyon. The major issue with them is comfortability when you…

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Answer 9

Hey Cres, how high of altitude are we talking? The Furrion RV Tankless Water Heater #FR98SR works well at high altitude. In fact, Furrion states, "This appliance can be used at high altitude and has been tested at up t0 4,500 ft."

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Answer 10

The reverse light pin on a traditional 7-way trailer connector, like part #PK11893 or a factory connector if that's what you have on your 2018 Ram, is the center pin. Take a look at the picture I attached that shows all the pin functions. To add…

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Answer 11

To connect back up lights you need to have a 7-way trailer connector on both your trailer and tow vehicle. On a 7-way the reverse lights are powered by the center pin. To connect reverse lights to the trailer's 7-way you can use 16 gauge wire…

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Answer 12

Ford service bulletin SSM 46257 for the 2017 F-350 indicates that the vehicles equipped with a factory trailer brake controller (TBC) utilize a trailer module (TRM) which initiates the trailer 12V charging system. For trailer charging circuit to…

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How To Activate 12V Trailer Charge Circuit On 2019 Ford Super Duty With Factory 7-Way

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