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Nilight

Nilight 4 Way Flat to 7 Way Round Blade Trailer Adapter Wiring Harness 4 Pin to 7 Pin Electrical Connect Wiring Plug Connector with Mounting Bracket for RV Truck Factory Tow Package

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Availability: In Stock.
Fulfilled by Amazon
Arrives Sunday, Jul 26
Order within 20 hours and 39 minutes
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Color: 4Way to 7Way Adapter


Features

  • Compact Traction Adapter: This adapter converts 4 way flat vehicle end to 7 way blade trailer end, makes tight connection between vehicle socket and trailer plug, no wiggle-room, no loose fittings. Transfers the power from the vehicle to trailer.
  • Function: 4-pin flat socket designed to be converted to the 7-pin blade round type socket. Works on most vehicle wiring component like turn signals, brakes,reverse light and auxiliary power.
  • Durable Construction: Heavy duty black plastic construction prevents rusting, enhances appearance. Well sealed spring loaded cover increases protection against dust, moisture and corrosion. Protects the inner contacts from rust or damage. The black wire loom keeps the wiring contained and protects the harness for long lasting use.
  • Easy to Install: The 4 way to 7 way trailer adapter equipped with mounting bracket, screws, and nuts,conveniently connect the trailer wiring adapter to your trailer hitch or bumper and just find the right position to install and tighten the nut to install successfully.
  • Wide Application: Come with 1 x Trailer Adapter Plug, 1 x Mounting bracket 6 screws & 6 nuts, 1 x User Manual. Perfect for most trailers, semitrailers, caravans, RV. Commonly used with T-connectors or tail lamp converters with 4-way flat car end connections

Description

Nilight Trailer Plug AdapterNilight 4-Way Flat to 7-Way Round Blade Trailer Adapter with Mounting Bracket for RV Truck Factory Tow Package is made to convert 4-way flat vehicle end to 7-way blade trailer end, makes the tight connection between vehicle socket and trailer plug, no wiggle-room, no loose fittings. Transfers the power from the vehicle to the trailer. Package Included: 1 x Trailer Adapter Plug, 1 x Mounting bracket 6 screws & 6 nuts, 1 x User Manual.

Brand: Nilight


Material: Plastic


Item Weight: 0.29 Kilograms


Connector Type: 4-way Flat to 7-way Round Blade


EU Spare Part Availability Duration: 2 Years


Brand Name: Nilight


Manufacturer: Nilight


UPC: 840323903363


Warranty Description: 2 Year Warranty


Global Trade Identification Number: 63


Part Number: 50303T


Model: 50303T


Unit Count: 1.0 Count


Included Components: 1PC 4-Way Flat to 7-Way Round Blade Trailer Adapter


Item Type Name: 4-Way Flat to 7-Way Round Blade Trailer Adapter


Item Weight: 0.29 Kilograms


Connector Type: 4-way Flat to 7-way Round Blade


EU Spare Part Availability Duration: 2 Years


Material Type: Plastic


Cable Type: Trailer Wiring Harness


Frequently asked questions

If you place your order now, the estimated arrival date for this product is: Sunday, Jul 26

Yes, absolutely! You may return this product for a full refund within 30 days of receiving it.

To initiate a return, please visit our Returns Center.

View our full returns policy here.

  • Klarna Financing
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  • Affirm Financing
  • Afterpay Financing
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  • Financing through Apple Pay
  • Financing through Google Pay
Leasing options through Acima may also be available during checkout.

Learn more about financing & leasing here.

Similar Products

Top Amazon Reviews

    • Works Perfectly
Color: 4Way to 7Way Adapter
Easy Installation, Comes complete with everything needed to convert any Vehicles 4 Way Flat to a 7 Way Round for bigger trailer plugs. You can also very easily still use your 4 Way Flat by simply unplugging your adapter. I had to purchase due to the lack of other adapters having the mounting bracket which is very well made and extremely sturdy. I’m very satisfied with this purchase. ... show more
Reviewed in the United States on May 3, 2026 by Jared
    • High quality and great value...!!!
Color: 4Way to 7Way Adapter
This item works perfectly and is literally plug and play. It is high quality and also a great value..! I compared this item at a local retail store where it is sells for double the price that it is on Amazon.
Reviewed in the United States on May 1, 2026 by ERIC DAMM
    • hard to find at a good price
Color: 4Way to 7Way Adapter
This wiring harness adapter worked great. Attached to both the trailer plug and the tow vehicle plug without difficulty. It is hard to find a 4 flat adapter with a hole for the ground and prongs for the lights which our vehicle plug took. Both ends fit just right. The adapter looks good. The harness feels like it has quality wires and appears to be made to last. I would recommend this adapter harness to anyone who is in the market for this type of connecter. Mike ... show more
Reviewed in the United States on November 21, 2025 by michael slatter
    • Good quality and price
Color: 4Way to 7Way Adapter
Works perfect on my truck
Reviewed in the United States on May 22, 2026 by Amazon Customer
    • Solid, Easy Upgrade from 4-Pin to 7-Pin – Works Exactly as Expected Solid, Easy Upgrade from 4-Pin to 7-Pin – Works Exactly as Expected
Color: 4Way to 7Way Adapter
Review Image by James Mc
This Nilight 4-Way Flat to 7-Way Round Blade Trailer Adapter is exactly what I needed to step up from a basic 4-pin setup to a full 7-pin connection on my truck with a factory tow package. Right out of the box, everything felt well-built and durable—no flimsy plastic or loose connections. Installation was straightforward and didn’t require any guesswork. The included mounting bracket is a big plus—it made it easy to secure the plug neatly to my hitch area so it looks clean and stays out of the way. The wiring harness length was sufficient, and the connectors fit snug with no issues. Once installed, all functions worked perfectly—brake lights, turn signals, running lights, and electric trailer brakes. That’s the key difference compared to a 4-pin, and this adapter handled it without any problems. It’s clearly designed for trucks that already have a tow package, so if you’ve got that, this is a plug-and-play upgrade. Another thing I appreciated is the weather-resistant construction. The housing feels sealed well enough to handle rain, mud, and road grime without corroding or failing over time. Overall, this is a reliable, affordable solution if you need to convert from 4-pin to 7-pin without replacing your entire wiring system. I’d definitely recommend it to anyone towing RVs or trailers that require a 7-way connection. Great value and solid performance. ... show more
Reviewed in the United States on March 27, 2026 Reviewed in the United States on March 27, 2026 by James Mc
    • It Works
Color: 4Way to 7Way Adapter
Makes it an easy install for vehicles that already have the four way plug, it mounts in the area of your choosing and looks like a stock part from the factory and has been on my truck for some time now and is very durable to conditions.
Reviewed in the United States on March 4, 2026 by Christopher W. Carter
    • Great for the price
Color: 4Way to 7Way Adapter
No issues putting it in works great no connection issues
Reviewed in the United States on May 28, 2026 by Dillon Harrington
    • Buy it
Color: 4Way to 7Way Adapter
Great product, easy to install.
Reviewed in the United States on May 4, 2026 by Mathew Rice

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