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Buyers Products Trailer Connector Adapter - 4-Way to 7-Way RV and 4-Way Flat

Buyers Products Trailer Connector Adapter - 4-Way to 7-Way RV and 4-Way Flat

Item # 337TC1474P
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337TC1474P - Multi-Function Adapter Buyers Products Wiring
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This multi-function, vehicle-end connector converts any 4-way flat, vehicle-end plug to a combination 7-way outlet and 4-pole flat outlet. Lowest Prices for the best wiring from Buyers Products. Buyers Products Trailer Connector Adapter - 4-Way to 7-Way RV and 4-Way Flat part number 337TC1474P can be ordered online at etrailer.com or call 800-298-8924 for expert service.
  • All Info
  • Reviews (6)
  • Q & A (3)
  • Videos (2)
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Buyers Products Wiring - 337TC1474P

  • Wiring Adapters
  • Multi-Function Adapter
  • Plug and Lead
  • Buyers Products
  • 4 Flat
  • 0 - 5 Feet Long

This multi-function, vehicle-end connector converts any 4-way flat, vehicle-end plug to a combination 7-way outlet and 4-pole flat outlet.


  • Adapts 4-way flat to both 7-way RV and 4-way flat
    • 4-Way flat output connects tail lights, brake lights, and turn signals
    • 7-Way connects tail, brake, reverse, turn signals, and auxiliary power
  • Dust covers are dirt and weather-resistant
  • Split loom keeps wires contained and protected from the elements
  • Simple installation
    • Wiring harness plugs into existing 4-way flat connector and hardwires to existing wiring to get additional functions needed for 7-way
  • Included hardware and metal mounting bracket secures wiring to the vehicle or trailer hitch
  • 1-Year warranty


  • Distance between bracket mounting holes center to center: 2-1/4"
  • Harness length: 10"
  • Yellow wire is for reverse lights
  • Blue wire is for brakes
  • Black wire is for 12 volt power
  • White wire is ground

57672 Connector Diagram

TC1474P Buyers Products 7-Way Dual-Plug Trailer Connector with 10 Inch Prewired Harness

Video of Buyers Products Trailer Connector Adapter - 4-Way to 7-Way RV and 4-Way Flat

Videos are provided as a guide only. Refer to manufacturer installation instructions and specs for complete information.

Video Transcript for Review of Buyers Products Wiring - Wiring Adapters - 337TC1474P

Today we're going to take a look at the Buyers Products four-way to seven-way RV and four-way flat trailer connector adapter. Now, this multifunction vehicle end connector will convert any four-way flat vehicle end plug to a combination seven-way outlet and four-way flat outlet. The four-way flat output will give you your taillights, brake lights, and left and right turn signals. And the seven-way RV gives you the taillights, brake lights, left and right turn signals, along with electric brakes, auxiliary backup lights and 12 volt power. The dust covers, you can see, there's a spring loaded one here on the seven-way. They're dirt and weather resistant.

Also, you have covers on the four-way right here and on this one also.Helps the split loom on this right here. This will help keep your wires contained and protected from the elements. It is a very simple installation. Basically this wiring harness right here will plug into your existing four-way flat connector on your vehicle and then the hard wires will exit wire to your existing wiring to give additional functions needed for the seven-way. It included everything laid out here on the table.

Includes the mounting bracket, the metal mounting bracket for the seven-way. Includes the mounting hardware to install the bracket to your vehicle and to install the seven-way to the mounting bracket.Does come with a nice set of detailed installation instructions on how to install this. Now the distance between the mounting bracket holes right here, center to center, is 2-1/4". Harness length on this is about 10" and the extra wires back here that gauge on them on the yellow wire. This is a 12 gauge yellow wire which is for auxiliary or back up lights.

There's a 12 gauge blue wire which is for your electric brakes. So 12 gauge black wire for 12 volt power and then the white wire with the eyelet on it, that's a 10 gauge size which is for your ground.So basically once you plug this into the four-way on your vehicle, attach these wires, then you have an operational seven-way and also a four-way also. And what will happen is you'll take your mounting bracket, what you want to do is slide all these through here and then slide your mounting bracket up. Get it through all the wires and then once you slide it up, you want to get it your four-way back through here. And then you can see this will slide up, the hose will line up.

Use your mounting hardware to install this to the metal bracket and then there's two screws here that'll attach the bracket to your vehicle. And then your four-way will just slide right on there. So you'll have a seven-way right here and a four-way if needed right there. So it gives you both plugs.But that should do it for the review on the Buyers Products four-way to seven-way RV and four-way flat trailer connector adapter.

Customer Reviews

Buyers Products Trailer Connector Adapter - 4-Way to 7-Way RV and 4-Way Flat - 337TC1474P

Average Customer Rating:  4.8 out of 5 stars   (6 Customer Reviews)

This multi-function, vehicle-end connector converts any 4-way flat, vehicle-end plug to a combination 7-way outlet and 4-pole flat outlet.

- 337TC1474P

One of the Best online ordering experience I have ever had the pleasure doing. Barry handled the transition from the beginning till the end and not knowing much about what I was talking about,he walked me though the entire process. It says a lot about a company when their employees take such pride and knowledge in their job performance. Again it was my first time working with your company and it definitely wont be the last Thank you so much for all the help the great product and the fast delivery 694233

- 337TC1474P

Perfect for my application. I give it 5 stars. Quality is good and the price is reasonable. 703675

- 337TC1474P

This installed very easy on my Ford Escape after market Draw Tite hitch. Watched the videos and didn't have any questions. Product was delivered fast. 797207

- 337TC1474P

Great item for the price. The 4-wire connector loosely slots into the side of the bracket, and doesn’t inspire confidence that it will stay there when the weight of a trailer harness is on there. Both of the self tapping screws snapped when I tried to attach it to the rear crossmember of a 2020 wrangler. I even drilled a pilot hole to give them a chance. They are probably only designed for light sheet metal. 754815

- 337TC1474P

5 th purcase from them always order is exactly what i orderd. Shipping is great get it on time or early 724663

- 337TC1474P

This is a solid 7 way adapter which I would recommend. You will need to buy a 12V wire and fuse to connect to your battery, or buy a kit that comes with these parts. I did not need those as this was a replacement for 7 way adapter I had already installed but damaged. 4 stars because - The 4 way plug just pops into a slot next to the 7 way connector but there is nothing that keeps it there. So it feels like it could fall out. - The included crimp connectors are the standard type, not the water resistant type. 672053


Ask the Experts about this Buyers Products Wiring

  • Can I Use Buyers Products Trailer Adapter For Just the 4-Way Functions
    Yes, you can plug your existing 4-way into the 4-way pigtail of the Buyers Products Trailer Connector Adapter part # 337TC1474P and ground the 7-way plug to a clean bare metal surface on the frame. You can tuck the black, blue and yellow wires away. The 4-way plug on the adapter will allow you to plug in a trailer that uses a 4-way trailer connector.
    view full answer...
  • 2018 Ford F150 Hitch 4-way to 7-way Trailer Connector
    If you need to connect to a trailer that has a 7-way but does not have or need brake signal, 12V power, or a reverse signal then you can the # 337TC1474P connector. It plugs into your existing 4-way and then you can tape the other wires up out of the way. I have included a video of this being installed with another kit on an SUV and at the very end of the video you can see this 7-way being installed. To get a fully functional 7-way on your 2018 Ford F-150 with a factory 4-way, you will...
    view full answer...
  • Trailer Hitch For 2018 Lincoln MKT For Towing a 4,000 Lb Trailer
    I was able to confirm that the Draw-Tite Max-Frame Trailer Hitch Receiver part # 75679 is a fit for the 2019 Lincoln MKT which is the only option. It is a great option with a custom fit design that does not require drilling into the frame of the Lincoln MKT. This will give a 2" receiver on the Lincoln that can tow 4,000 lbs however you do want to check the owner's manual to make sure you can tow 4,000 lbs safely. For the trailer wiring, I recommend 7-way plug part # A10-7072VP which...
    view full answer...

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Info for this part was:

Edited by:
Lindsey S
Video Edited:
Jeff D
Video Edited:
Chris R
Test Fit:
Robert C
Written by:
Kristina F
Video by:
Aidan B

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