Parts Needed to Install 7-Way on 2016 Ford F-150 with 4-Way

Question

Question:

I have a 2016 f150 with factory 4 pin I want to convert to a 4 and 7 pin I found this plug part #HM40975 now I need the wiring harness to plug directly into my factory plug

asked by: Jay

0

Expert Reply:

For your 2016 Ford F-150 if your trailer does not have brakes all you would need is the part # 37185 as an adapter to convert the 4-way to a 7-way.

If you do have trailer brakes you would need the # 37185 and the install harness part # 22292. If you check out the install video I attached you will see how the connections would be made.

For a brake controller I would recommend the Prodigy P2 Brake Controller part # 90885. This is our best selling brake controller because of how well it works and how easy it is to setup.

I can't recommend the # HM40975 as a fit as it would not wire up properly to your vehicle since it doesn't have the needed harness and that's not something we carry.

expert reply by: Jameson C

0

Dennis C.

5/24/2026

The accessories are no loner offered by Etrailer.

Jameson C.

5/26/2026

@DennisC Yes and it's a bummer as the company that made basically everything I mentioned went out of business. Do you have a 2016 F-150 and want a way to install a brake controller? If so, the part # RED67CR is the way to go now which includes the install harness. Then for a 4-way to 7-way adapter you would want the part # C57672.

Dennis C.

5/26/2026

@JamesonC I had asked if RED44UR controller would work. You recommended the RED67CR. Both show as available for immediate shipment at etrailer. Can you please explain why you recommend one over the other? I want a proportional controller which will apply the brakes based upon inertia. The 7 way adapter you recommended is not suitable because it is not plug and play. I wanted the Curt C56413 which is listed on line as available from you for immediate shipment and I can buy from others if you can not ship. I will call into the store tomorrow morning to find out what is in stock so I can decide what and who to order from. Thank you

Jameson C.

5/27/2026

@DennisC I didn't see where you had asked about the part # RED44UR but it does for sure fit as well. This version of the controller has a time delayed as well as a proportional brake controller whereas the part # RED67CR is just proportional. Proportional is the way to go and you wouldn't use the time-delayed setting unless

See All (5) Replies to Dennis C. ∨

Answer 1

To add a brake controller to your 2016 Ford F-150 with the factory 4 pole, I recommend the Curt T-Connector Vehicle Wiring Harness with 7-Way Trailer Connector Item #C56413. It is a simple plug in wiring harness. I also recommend adding a No-Drill…

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Answer 2

We have actually run into this issue quite a few times in the past, and there is a simple fix. The reason the Curt Echo Wireless #C51180 locks up the brakes on your camper only at low speeds is due to it being paired incorrectly, usually plugging in…

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Answer 3

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Answer 4

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 5

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 6

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 7

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Answer 8

The difference between an load range C and load range D tire in the same size is the capacity and psi rating. The two tires will still have the same dimensions and fit on the same wheel. The D rated tire has a higher capacity. For a ST175/80D13 like…

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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

It sounds like you are speaking of the wires for the brake magnets. If this is correct, you will need to connect one of the wires to the brake controller output wire on your trailer connector and the other wire will need to be grounded to a clean…

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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

The two sizes you mentioned are pretty similar and fit many of the same 15 inch wheels. The 205/75-15 fits rim widths of 5 inch to 6 inch whereas the 225/75-15 fits widths that are 5 inch to 6-1/2 inch. The 205 is 27.1 inches tall and the 225 is 28.4…

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Parts Needed to Install 7-Way on 2016 Ford F-150 with 4-Way

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