4-Flat Trailer Wiring Harness For A 2021 Ford F-150 With Existing Factory 7-Way

Question

Question:

I have a 2021 Ford F-150 XLT and want to install a 4-pin flat connector. Do you know if anyone makes a custom connector that plugs into the existing wiring harness of the truck? Thank you for any help you can give me.

asked by: Glen

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Expert Reply:

When choosing the correct 4-flat wiring harness for your 2021 Ford F-150 that already has the factory 7-way I recommend The Curt T-Connector Vehicle Wiring Harness with 4-Pole Flat Trailer Connector # C75WR. I like this harness because it is constructed using surface-mount technology that gives it a consistent, reliable performance. This harness will plug into your vehicle's wiring harness, which is located behind the driver's-side and passenger's-side tail lights.

Just a quick note that this harness is intended for vehicles without LED tail lights and will not work on models that have the backup sensors installed. I attached a review video link below explaining more features of the harness. If you have any other questions please reach back out to me and I will be more than happy to help you further with your towing endeavors.

expert reply by: Noah E

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Answer 1

The only possible option we have that would work with your 2023 Ford F-150 without LED's is the Curt item #C75WR. This custom fit T-connector plugs in behind your tail lights but only works if your truck came from the factory with a 7-way…

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Answer 2

I do have an option for you that will allow you to not have to splice into your taillights, but we do not have a product that is similar to the Leer 300200 harness. The Tekonsha T-One Vehicle Wiring Harness #118384 will connect in line of the factory…

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Answer 3

All the brake controller needs to sense a trailer connection so that you can test it is a slight amperage draw on the output circuit. For that you can use a circuit tester like the part #PTW2993 with one pin grounded and the other on the output pin.…

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Answer 4

The difference between the Class II and Class III hitches has to do with their Gross Trailer Weight (GTW), their Tongue Weight (TW), and their Hitch Receiver Size. Class II trailer hitch receivers have a 1-1/4 inch receiver and can be rated up to…

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Answer 5

A 4-Way trailer connector has the basic lighting functions only; running lights, left turn signal and brake lights, right turn signal and brake lights, and ground. A 7-Way has these functions and a 12 volt circuit, a circuit for electric trailer…

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Answer 6

In order to determine the torque rating for the lug nuts on your trailer you will need to know check out the chart I attached that shows all of the torque specs for all the trailer lugs available based on stud size, wheel material and wheel size.

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Answer 7

According to Blue Ox, it'll take an experienced installer about 4 to 5 hours to complete the installation of their #BX1128 Base Plate Kit on a 2016 Jeep Grand Cherokee. The install isn't what I'd call super-difficult, but the installation…

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Answer 8

Hey Andrew! Yes, Furrion does have a Chill Cube model with a heat pump. This was actually just released for aftermarket sale. You will need a complete system to make the switch, new R32 units aren't backwards compatible with old R410A systems.…

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Answer 9

The OEM prep package consists of 4 "pucks" in the bed of the truck that will allow you to drop in puck style hitches for easy installation and removal, that gives you a completely clear bed when not in use. The B&W Companion OEM 5th…

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Answer 10

Yes, it will work. You'll just need to cut the Lance 6-pin connector out and rewire it into the etrailer Trailer Wiring 7-Way Upgrade Kit w/ Junction Box and RV Style Connector item #e99011. Here are the individual functions of that Lance 6-pin:…

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Answer 11

If you just need a 4-pin to 7-pin trailer wiring adapter, then you can use part #C57672. This will plug into the 4-pin trailer connector on your brother's vehicle and give him the 7-pin socket for the trailer. Keep in mind, this will only give…

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Answer 12

Since wire color codes are NOT universal, we always recommend wiring by function, rather than wire color. If you look at the Trailer Wiring FAQ article I have linked you to, you can see some diagrams showing the proper way to wire a vehicle and…

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4-Flat Trailer Wiring Harness For A 2021 Ford F-150 With Existing Factory 7-Way

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