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etrailer Trailer Wiring 7-Way Upgrade Kit w/ Junction Box and RV Style Connector
etrailer Trailer Wiring

(299 reviews)


Code: e99011

Our Price: $53.41
In Stock
  • Trailer Wiring
  • Trailer Connectors
  • Junction Box
  • Trailer End Connector
  • 6 - 10 Feet Long
  • Plug and Lead
  • 7 Round - Blade
  • etrailer


This kit includes a junction box so you can quickly and easily connect the wires from the included trailer connector to your trailer's wiring.

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etrailer 7-Way RV Style Connector with Molded Cable - Trailer End - 6' Long - RV Standard
etrailer Trailer Wiring

(70 reviews)


Code: e99010

Our Price: $25.53
In Stock
  • Trailer Wiring
  • Trailer Connectors
  • Trailer End Connector
  • 6 - 10 Feet Long
  • Plug and Lead
  • 7 Round - Blade
  • etrailer


Replaces your damaged 7-way, RV-style, trailer-end connector. Durable cable covering insulates and protects wires from the elements. Wiring codes are RV standard.

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Curt Dual Connection Socket w/ Bracket - 7-Way RV Style and 4-Way Flat - Vehicle End
CURT Trailer Wiring

(1 reviews)


Code: C36GJ

Our Price: $57.76
In Stock
  • Trailer Wiring
  • Trailer Connectors
  • Vehicle End Connector
  • 4 Flat
  • 7 Round - Blade
  • Plug Only
  • CURT


Easily connect either a 7-way or 4-way trailer-end connector with this dual-outlet socket. Simply plug this into your vehicle's OEM USCAR wiring system and mount it with the included bracket.

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Hopkins 7-Way RV Style Connector with Molded Cable - Trailer End - 8' Long - RV Standard
Hopkins Trailer Wiring

(891 reviews)


Code: H20046

Retail: $52.29
Our Price: $46.90
In Stock
  • Trailer Wiring
  • Trailer Connectors
  • Trailer End Connector
  • 6 - 10 Feet Long
  • Plug and Lead
  • 7 Round - Blade
  • Hopkins


Replace your damaged 7-way, RV-style, trailer-end connector with this molded cable. Durable cable covering resists damage. Wiring codes are RV standard.

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Hopkins 7-Way Blade Style Connector with Molded Cable - Trailer End - 8' Long - Auto Standard
Hopkins Trailer Wiring

(73 reviews)


Code: HM20041

Our Price: $82.65
In Stock
  • Trailer Wiring
  • Trailer Connectors
  • Trailer End Connector
  • 6 - 10 Feet Long
  • Plug and Lead
  • 7 Round - Blade
  • Hopkins


Replace your damaged 7-way, blade-style, trailer-end connector with this molded cable. Durable cable covering resists damage. Wiring codes are auto-industry standard.

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Curt Trailer Connector Adapter - 4-Way to 7-Way RV and 4-Way Flat
CURT Trailer Wiring

(442 reviews)


Code: C57672

Retail: $50.36
Our Price: $41.38
In Stock
  • Trailer Wiring
  • Wiring Adapters
  • Multi-Function Adapter
  • 4 Flat
  • Plug and Lead
  • 4 Flat
  • 7 Round - Blade
  • CURT


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.

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Hopkins Tow Doctor Trailer End Test Unit
Hopkins Trailer Wiring

(44 reviews)


Code: HM50928

Retail: $637.69
Our Price: $490.66
In Stock
  • Trailer Wiring
  • Testers
  • Tow Function Tester
  • Hopkins


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7-Pole Blade to 5-Pole Flat Connector Wired Trailer Adapter - Coiled Cable - 94-1/2" Long
Optronics Trailer Wiring

(222 reviews)


Code: A57CCB

Retail: $76.48
Our Price: $70.52
In Stock
  • Trailer Wiring
  • Wiring Adapters
  • Single-Function Adapter
  • 7 Round - Blade
  • Plug and Lead
  • 5 Flat
  • Optronics


Trailer adapter converts a tow vehicle's 7-pole wiring connection to a 5-pole flat pin connection for towing trailers with hydraulic brakes. Coiled cord stretches and contracts for extra flexibility. Threaded bracket ensures a secure connection.

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Curt Cold Weather 7-Way RV Style Connector - Trailer End - 10' Long - RV Standard
CURT Trailer Wiring

(4 reviews)


Code: C23RJ

Our Price: $106.04
In Stock
  • Trailer Wiring
  • Trailer Connectors
  • Trailer End Connector
  • 6 - 10 Feet Long
  • Plug and Lead
  • 7 Round - Blade
  • CURT


If you live somewhere with intense cold weather, you know that dealing with a cracked cable is a pain. This 10' long cold-weather 7-way RV-style trailer end cable can keep you from having to replace your 7-way blade connector every year or so.

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7-Way Molded Trailer Wire Connector, 4' Long
Hopkins Trailer Wiring

(365 reviews)


Code: H20043

Retail: $60.39
Our Price: $32.01
In Stock
  • Trailer Wiring
  • Trailer Connectors
  • Trailer End Connector
  • 0 - 5 Feet Long
  • Plug and Lead
  • 7 Round - Blade
  • Hopkins


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Curt 7-Way to RV Socket LED Circuit Tester - Vehicle End
CURT Trailer Wiring

(120 reviews)


Code: C73NR

Retail: $30.42
Our Price: $19.90
In Stock
  • Trailer Wiring
  • Testers
  • Circuit Tester
  • Tow Function Tester
  • CURT


This circuit tester plugs into the 7-way connector on your vehicle. LED lights indicate which functions (brake, turn, tail, stop, reverse, electric brakes, and 12V) are properly working. Color-coded LEDs make it easy to distinguish each signal.

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Pollak Replacement 7-Pole, RV-Style Trailer Connector Socket - Vehicle End
Pollak Trailer Wiring

(696 reviews)


Code: PK11893

Retail: $26.36
Our Price: $15.27
In Stock
  • Trailer Wiring
  • Trailer Connectors
  • Vehicle End Connector
  • Plug Only
  • 7 Round - Blade
  • Pollak


This 7-pole, sealed, RV-style trailer connector plugs into the factory socket on your truck or SUV. Connector is an exact OE replacement on Chevy, Ford, GMC and Nissan.

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Hopkins Endurance Quick-Install 7-Way Trailer Connector
Hopkins Trailer Wiring

(12 reviews)


Code: HM55FR

Our Price: $84.49
In Stock
  • Trailer Wiring
  • Trailer Connectors
  • Vehicle End Connector
  • Plug and Lead
  • 7 Round - Blade
  • Hopkins


This kit lets you add a 7-way, RV-style trailer connector to your vehicle with a factory tow package. Included harness plugs into existing wiring, and 7-way connector plugs into harness - no cutting or splicing required.

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25 Ft 4-Way Trailer Wiring Harness - Wishbone Style - 25' Ground
Optronics Trailer Wiring

(256 reviews)


Code: A25W2GWB

Our Price: $28.50
In Stock
  • Trailer Wiring
  • Trailer Connectors
  • Trailer End Connector
  • 21 - 30 Feet Long
  • Plug and Lead
  • 4 Flat
  • Optronics


4-Way trailer harness connects to your tow vehicle to control trailer light functions. Wishbone-style harness comes with 2 tail light wires split for simple wiring.

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35 Ft 4-Way Trailer Wiring Harness - Wishbone Style - 42" Ground
Optronics Trailer Wiring

(819 reviews)


Code: A35W42B

Our Price: $25.34
In Stock
  • Trailer Wiring
  • Trailer Connectors
  • Trailer End Connector
  • 31 Feet and Longer
  • Plug and Lead
  • 4 Flat
  • Optronics


4-Way trailer harness connects to your tow vehicle to control trailer light functions. Wishbone-style harness comes with 2 tail light wires split for simple wiring.

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Bargman 7-Way, RV-Style Connector w/ 6' Long Coiled Cable - Trailer End
Bargman Trailer Wiring

(134 reviews)


Code: WG54006-043

Retail: $73.55
Our Price: $47.06
In Stock
  • Trailer Wiring
  • Trailer Connectors
  • Trailer End Connector
  • 6 - 10 Feet Long
  • Plug and Lead
  • 7 Round - Blade
  • Bargman


This molded, 7-way, RV-style, trailer-end connector allows you to connect your trailer to your vehicle. Coiled cord extends to 6' and then contracts conveniently for storage.

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7-Way Round RV Style Trailer Connector - Trailer Side
Optronics Trailer Wiring

(348 reviews)


Code: A7WCB

Our Price: $13.74
In Stock
  • Trailer Wiring
  • Trailer Connectors
  • Trailer End Connector
  • Plug Only
  • 7 Round - Blade
  • Optronics


7-Way round plug lets you connect your trailer to the 7-way round blade connector of your tow vehicle. Interlock system keeps connections in place. Over-sized finger grips for secure disconnections. Durable ABS plastic housing.

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Pollak 7-Way to RV Socket LED Circuit Tester - Vehicle End
Pollak Trailer Wiring

(149 reviews)


Code: PK12741

Retail: $44.96
Our Price: $39.06
In Stock
  • Trailer Wiring
  • Testers
  • Circuit Tester
  • Tow Function Tester
  • Black
  • Pollak


This circuit tester plugs into the 7-way connector on your truck. LED lights indicate which functions (brake, turn, tail, stop, reverse and 12V) are properly working.

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Pollak Black Plastic, 7-Pole, RV Blade-Style Trailer Socket - Vehicle End
Pollak Trailer Wiring

(320 reviews)


Code: PK12-707E

Retail: $18.94
Our Price: $14.15
In Stock
  • Trailer Wiring
  • Trailer Connectors
  • Vehicle End Connector
  • Plug Only
  • 7 Round - Blade
  • Pollak


Establish a secure connection between your towing vehicle and trailer with this 7-pole, RV blade-style socket. Black plastic socket has non-corroding, shock-resistant interior design that eliminates shorting out and is color-coded to RVI standards.

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Bargman 7-Way, RV-Style Connector w/ 10' Heavy Duty Insulated Cable - Trailer End
Bargman Trailer Wiring

(51 reviews)


Code: 54006-059

Retail: $108.89
Our Price: $81.93
In Stock
  • Trailer Wiring
  • Trailer Connectors
  • Trailer End Connector
  • 6 - 10 Feet Long
  • Plug and Lead
  • 7 Round - Blade
  • Bargman


This molded, 7-way, RV-style, trailer-end connector allows you to connect your trailer to your vehicle. Insulated cable covering is ideal for cold temperatures. Hardwires to existing wiring.

More Information >


Explore Expert Info Our Expert
on Trailer Wiring

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for Trailer Wiring

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for Trailer Wiring

Expert Answers

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7-Way to 4-Way/5-Way Trailer Adapter for Vehicles with Lamp-Out Sensors Towing Trailers with LEDs
CURT Trailer Wiring

(107 reviews)


Code: C35FR

Retail: $28.95
Our Price: $24.63
In Stock
  • Trailer Wiring
  • Wiring Adapters
  • Multi-Function Adapter
  • 7 Round - Blade
  • Plug Only
  • 5 Flat
  • 4 Flat
  • CURT


Curt 7-way connector to 4-way or 5-way flat connector is designed for use on vehicles with Trailer Lamp-Out sensors when towing a trailer equipped with LED lights.

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TorkLift Wiring Harness Extension for 36" SuperTruss or Cannon Hitch Extender - 7-Way RV
TorkLift Trailer Wiring

(61 reviews)


Code: TLW6036

Our Price: $130.90
In Stock
  • Trailer Wiring
  • Wiring Adapters
  • Single-Function Adapter
  • 0 - 5 Feet Long
  • 7 Round - Blade
  • Plug and Lead
  • 7 Round - Blade
  • TorkLift


Designed for use with your 36" long SuperTruss or Cannon receiver extension, one end of this no-splice wiring harness plugs into your truck's 7-way blade trailer connector. The other end runs back 42" to clear your bed-mounted camper.

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Trailer Connector Adapter w/ Lamp-Out Sensor Bypass - 7-Way RV to 7-Way RV - Vehicle End
Tow Ready Trailer Wiring

(159 reviews)


Code: 20142

Retail: $47.88
Our Price: $29.19
In Stock
  • Trailer Wiring
  • Wiring Adapters
  • Single-Function Adapter
  • 7 Round - Blade
  • Plug Only
  • 7 Round - Blade
  • Tow Ready


Designed for use with vehicles that have lamp-out sensors, this adapter ensures that your trailer with LED lights does not trigger any warnings or hyperflashing when hooked up to your vehicle's 7-way, blade-style connector.

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Bargman 7-Way, RV-Style Connector w/ 8' Heavy Duty Insulated Cable - Trailer End
Bargman Trailer Wiring

(56 reviews)


Code: 54006-058

Retail: $90.46
Our Price: $74.47
In Stock
  • Trailer Wiring
  • Trailer Connectors
  • Trailer End Connector
  • 6 - 10 Feet Long
  • Plug and Lead
  • 7 Round - Blade
  • Bargman


This molded, 7-way, RV-style, trailer-end connector allows you to connect your trailer to your vehicle. Insulated cable covering is ideal for cold temperatures. Hardwires to existing wiring.

More Information >



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Trailer Wiring: Connect with Confidence

Trailer wiring is essential for ensuring your trailer's lights and brakes function properly. Whether you're rewiring a boat trailer or setting up a new RV connection, choosing the right wiring kit can make installation a breeze. Consider compatibility with your vehicle, ease of installation, and durability in various weather conditions.

Selecting the right kit depends on your vehicle's existing wiring setup and the type of trailer you have. For vehicles not prewired, a complete kit with connectors and adapters is ideal. Ensure compatibility with your trailer's lighting and brake systems, and consider kits with easy-to-follow instructions or video guides for a smoother installation.
Installation can be tricky if your vehicle isn't prewired, requiring connections under the hood and dash. Some kits may have mounting issues or require additional tools like heat shrink connectors. It's crucial to follow instructions carefully and use dielectric grease to protect connections from moisture and corrosion.
Durability is key, especially in harsh weather. Use dielectric grease on connections to prevent corrosion, and consider heat shrink connectors for added protection. Regularly inspect the wiring for wear and tear, and ensure all connections are secure to prevent separation or damage.
If the wiring doesn't fit, you may need an adapter or converter, especially if your vehicle and trailer have different plug types. Check the specifications of both your vehicle and trailer to ensure compatibility, and consider purchasing a universal adapter for flexibility.
Using quality components ensures reliable performance and longevity. Inferior parts can lead to connection failures, shorts, or corrosion, especially in challenging environments like saltwater exposure. Investing in high-quality wiring and connectors can save time and money in the long run.