what type of trailier wiring do you need for lights to work on trailier
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Equipping Your Vehicle with Proper Tow Wiring
Any vehicle towing a trailer requires trailer connector wiring to safely connect the taillights, turn signals, restriction lights and other necessary electrical systems.
If your vehicle is not equipped with a working trailer wiring harness, there are a number of dissimilar solutions to provide the perfect fit for your specific vehicle. Complete with a color coded trailer wiring diagram of each plug type, this guide walks through each available solution, including custom wiring, splice-in wiring and replacement wiring.
If you're looking to replace the wiring on your trailer, bank check out our trailer rewiring guide.
three Options for Installing Trailer Wiring on Your Vehicle
A. Custom wiring
Vehicle-specific plug-and-play harness that requires no splicing and provides a standard trailer connector
B. Splice-in wiring
Taillight converter that splices into your existing vehicle wiring and provides a standard trailer connector
C. Replacement plugs and sockets
Trailer plugs and vehicle sockets to splice in and replace damaged wiring connectors
Option A: Custom Wiring Installation
Custom wiring is the platonic solution for installing trailer low-cal wiring on your vehicle. A custom wiring harness or 'T-connector' is a vehicle-specific harness that plugs in without any spicing required and provides a standard connector output, such as a 4-fashion apartment.
All Curt custom wiring comes with the verbal components needed for a complete installation on the vehicle, including vehicle-specific plugs and an electrical converter, if needed.
Custom Wiring Harness Installation Example Video
2 Types of Custom Wiring
Custom Wiring Harnesses
A custom wiring harness has multiple plugs that are used to 'T' into the vehicle'due south taillight assembly, drawing power directly from the taillights or from a direct battery connexion and providing a standard trailer light wiring connector. While custom wiring harnesses usually require two or more connection points, splicing and soldering are still not needed.
Custom Wiring Connectors
While some vehicles may non be equipped with a standard trailer wiring connector, they may accept a special socket specifically intended for installing wiring, provided by the vehicle manufacturer. A custom wiring connector uses a single plug to plug into this factory socket and provide a standard trailer wiring connector.
Original Equipment Trailer Wiring for USCAR
Some other type of custom wiring is original-equipment (OE) wiring or USCAR wiring. Select vehicles come with a standardized USCAR socket that provides a connection point for a CURT OE wiring harness.
Like a T-connector, an original equipment wiring harness plugs into the USCAR socket without any cutting, splicing or soldering required, and it provides a standard trailer wiring output, such as a iv-fashion flat or 7-way RV blade.
Learn more than nigh USCAR wiring
Option B: Taillight Converter Splice-in Wiring
If custom wiring is not bachelor for your detail brand and model, a taillight converter may be required to equip your vehicle with the proper trailer light wiring connection.
A taillight converter or electrical converter splices into your vehicle and provides a standard trailer plug wiring connector, typically a 4-manner apartment. The converter converts the vehicle'due south circuitous wiring system to be compatible with your trailer's simple wiring organisation. To learn more nigh vehicle wiring systems, bank check out our vehicle wiring systems guide.
Splice-In Wiring Installation Example Video
Option C: Replacement Vehicle and Trailer Wiring
If the trailer plug wiring on your vehicle or trailer is damaged or not working correctly, you can replace the connector with a CURT splice-in plug or socket.
Plugs (trailer side) and sockets (vehicle side) are available in all standard formats and tin exist spliced into your existing tow wiring. Detect the trailer light wiring diagram below that corresponds to your existing configuration.
If you are rewiring your trailer completely, check out our trailer rewiring guide.
How to Wire Trailer Lights
iv-Pin Trailer Wiring Diagram
Following the standard method for wiring a trailer connector is vital to the safety of your vehicle while towing. Connecting the wrong color wires will issue in mismatched taillight functions and confusion on the road.
Employ this 4-pivot wiring diagram to properly wire your iv-wire trailer plug.
• Green Correct plough / brakes
• Yellow Left plough / brakes
• Brown Taillights
º White Ground
4-Wire Trailer
Notation: The ground wire color for a four-flat plug is white and should be properly grounded at the trailer tongue. Read the complete rewiring guide for more.
5-Pin Trailer Wiring Diagram
5-pivot trailer wiring is very similar to 4-pin wiring, merely it adds in a blue wire for the reverse or backup lights.
Non all trailers accept contrary lights, so consider your own trailer as you lot wire in a 5-style plug.
• Blue Reverse lights
• Dark-green Correct turn / brakes
• Yellowish Left plow / brakes
• Brown Taillights
º White Ground
half-dozen-Pin Trailer Wiring Diagram
6-pin trailer wiring introduces two new functions, a wire for connecting trailer brakes and a wire for +12-volt auxiliary power.
six-way wiring is almost common on gooseneck trailers and allows for use with a restriction controller.
• Brown Taillights
• Blue Electric brakes
• Greenish Right turn / brakes
• Xanthous Left plow / brakes
º White Ground
• Blackness +12 volt
Round 7-Pin Wiring Diagram
The 7-way round trailer plug is to be distinguished from vii-manner RV blade plugs. The wiring connections and placement are different.
Be sure to review your own trailer connector before wiring.
º White Footing
• Chocolate-brown Taillights
• Green Right turn / brakes
• Red Auxiliary power
• Yellow Left plow / brakes
• Black Reverse lights
• Blue Electrical brakes
RV Blade vii-Pin Trailer Wiring Diagram - SAE
The SAE configuration of a 7-way RV blade plug should non be confused with the traditional configuration. Different wire colors are used for dissimilar functions.
Review your own trailer before wiring.
• Chocolate-brownTaillights
• YellowLeft plough / brakes
º WhiteGround
• BlueishElectric brakes
• GreenCorrect turn / brakes
• Orangish+12 volt
• GrayContrary lights
RV Bract 7-Pin Trailer Wiring Diagram - Traditional
7-pin trailer wiring is i of the nearly popular wiring configruations, particularly the traditional configuration versus the SAE J2863.
Use this 7-pivot trailer wiring diagram to properly wire your 7-pin trailer plug.
• Light-green Taillights
• Carmine Left turn / brakes
º White Ground
• Bluish Electrical brakes
• Brown Correct turn / brakes
• Black +12 volt
• Yellow Reverse lights
seven-Wire Trailer (RV Blade - Traditional)
Note: Not all trailers are equipped with reverse lights (xanthous wire). The position of this wire may vary for your ain specific setup.
Trailer Wiring Colors & Diagrams
Notation: The ground wire color on all trailer plug types is ever white. Other colors vary in role, depending on the configuration.
Download complete tabular array
7-Style RV Blade - Traditional Configuration
• Dark-green Taillights
• Ruby-red Left turn / brakes
º White Ground
• Blue Electric brakes
• Brownish Correct turn / brakes
• Blackness +12 volt
• Xanthous Reverse lights
7-Way RV Bract - SAE J2863 Configuration
• BrownTaillights
• YellowLeft turn / brakes
º WhiteGround
• BlueElectric brakes
• GreenishCorrect turn / brakes
• Orange+12 volt
• GreyContrary lights
Differences in seven-Pin Trailer Wiring
Traditional configuration
The traditional 7-way RV bract format is typically used on fifth wheel trailers, travel trailers and campers. The trailer wiring colors for this configuration are different than those on the SAE configuration.
SAE J2863 configuration
The SAE J2863 vii-way RV blade format is typically used on gooseneck trailers, utility trailers, cargo trailers and equipment trailers.
vii-Mode Circular
º White Ground
• Brown Taillights
• Dark-green Right turn / brakes
• Ruddy Auxiliary power
• Yellowish Left turn / brakes
• Black Reverse lights
• Bluish Electric brakes
six-Way Circular
• Brownish Taillights
• Bluish Electric brakes
• Green Right turn / brakes
• Yellowish Left plow / brakes
º White Ground
• Black +12 volt
6-Style Foursquare
º White Ground
• Red +12 volts
• Bluish Electrical brakes
• Yellow Left plough / brakes
• Chocolate-brown Taillights
• Green Right turn / brakes
5-Way Flat
• Blue Contrary lights
• Light-green Right turn / brakes
• Yellow Left plow / brakes
• Brown Taillights
º White Ground
4-Way Round
• Dark-green Right plow / brakes
º White Basis
• Yellow Left turn / brakes
• Brown Taillights
4-Way Flat
• Green Right plow / brakes
• Yellow Left plow / brakes
• Dark-brown Taillights
º White Footing
Common Connectors by Trailer Type
Trailers are equipped with dissimilar plug types based on their electrical components. The chart below provides examples of common trailers and the types of plugs they typically use.
| Trailer Type | Common Connector Blazon | Alternative Connector Types | |
| Utility trailer | four-style apartment | 6-way round | 7-way RV bract |
| Boat trailer without surge brakes | 4-style flat | vii-way RV blade (rarely used) | |
| Boat trailer with surge brakes | 5-way flat | six-fashion circular | 7-style RV blade |
| Pop up camper | six-mode foursquare | 6-mode round | |
| Travel trailer | 7-way RV blade | 6-way round | 7-way round |
| fifth cycle trailer | vii-mode RV blade | vi-way round | |
| Gooseneck trailer | 6-way round | seven-way RV blade | |
| Larn more virtually different trailer types hither. Refer to the wiring diagrams to a higher place for functions of trailer wiring colors. | |||
Towing 101 Table of Contents
Source: https://www.curtmfg.com/towing-electrical-wiring
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