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

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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.

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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

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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.

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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. :(

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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?

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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.

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James B.

7/15/2020

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

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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.

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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.

Reply

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.

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Answer 1

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…

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Answer 2

All 2017 F-Super Duty vehicles equipped with a factory trailer brake controller (TBC) utilize a trailer module (TRM) which initiates the trailer charging system. For trailer charging to operate, the TRM must detect a trailer is connected and a brake…

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Answer 3

I would be happy to help. Since you replaced the Trailer Tow Parks Lamps Fuse 53 in your 2019 Ford F-150 and are now not getting any power to your 7-way connector, I recommend checking fuse 43 as it is for the trailer tow park lamps module. If that…

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Answer 4

A lot of times the 12 volt accessory circuit isn't active on vehicles for the trailer wiring. Sometimes it's just a matter of inserting or replacing a fuse under the hood of the vehicle. Or in other times a relay has to be installed.…

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Answer 5

Your charging system on your 2019 Ford F-350 will regulate the battery voltage for the truck battery. That will regulate the voltage that the trailer battery has preventing it from overcharging when connected to the truck.

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Answer 6

It's possible. Here's Cargo Towing Solutions troubleshooting procedure for if the actuator won't run, or runs continuously: Verify that the trailer and tow vehicle are wired according to the electrical schematic shown below. Perform the…

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Answer 7

In order to install a two wire breakaway switch like the Replacement Breakaway Switch with Cable and Pin part #3802348 to an existing trailer battery you will want to attach one of the wires to the brake output signal (usually blue) on the trailer…

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Answer 8

You can definitely run constant power to the 7 way if needed. All you would need is a length of wiring and a circuit breaker. Twenty feet of the Deka 12 Gauge Primary Wire #12-1-1 would give you a bit of excess, but it never hurts to get a little…

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Answer 9

For rear suspension enhancement that is a confirmed fit for your 2019 Ford F-350 and is also compatible with the in-bed factory rail kit your truck has we have the Timbren kit part #TFR350SDJ which would fit and work well. This gives you the rear…

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Answer 10

No, you could use another system like the Brake Buddy Select 3 Portable Supplemental Braking System #HM39524 which uses an inertia sensor to activate the brakes. This system applies your towed car's brakes with an intensity that matches your…

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Answer 11

In order for the 12 volt circuit on the 7-way in your 2018 Ford F-350 to receive power, you will need to activate this in the information center on your dash. Please note that once this is done the 12 volt circuit on the 7-way will still not show…

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Answer 12

I really wish we had an easy solution, but the smart tow setup of your 2019 Ford F-150 won't allow the 12 volt circuit to be active without an actual trailer connected. That said I do have an option to bypass the factory wiring and give you an…

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

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