How To Install 7 Way Trailer Wiring

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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, brake lights and other necessary electrical systems.

If your vehicle is non equipped with a working trailer wiring harness, there are a number of different solutions to provide the perfect fit for your specific vehicle. Consummate with a colour 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, check out our trailer rewiring guide.

3 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 supersede damaged wiring connectors

Option A: Custom Wiring Installation

Custom wiring is the ideal 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 whatever spicing required and provides a standard connector output, such as a 4-way flat.

All CURT custom wiring comes with the exact components needed for a complete installation on the vehicle, including vehicle-specific plugs and an electrical converter, if needed.

Custom Wiring Harness Installation Case Video

Ii 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 associates, drawing power direct from the taillights or from a direct bombardment connexion and providing a standard trailer light wiring connector. While custom wiring harnesses usually require two or more connection points, splicing and soldering are withal not needed.

Custom Wiring Connectors

While some vehicles may not exist equipped with a standard trailer wiring connector, they may have 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

Another type of custom wiring is original-equipment (OE) wiring or USCAR wiring. Select vehicles come with a standardized USCAR socket that provides a connexion point for a Short OE wiring harness.

Similar 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-style apartment or 7-manner RV blade.

Larn more near USCAR wiring

Choice B: Taillight Converter Splice-in Wiring

If custom wiring is not available for your particular make and model, a taillight converter may exist 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 four-mode apartment. The converter converts the vehicle's circuitous wiring system to exist compatible with your trailer's simple wiring organisation. To learn more about vehicle wiring systems, 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 tin 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 can exist spliced into your existing tow wiring. Find the trailer lite wiring diagram below that corresponds to your existing configuration.

If you are rewiring your trailer completely, cheque 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 incorrect colour wires volition outcome in mismatched taillight functions and confusion on the road.

Use this iv-pin wiring diagram to properly wire your 4-wire trailer plug.

• Green Correct plough / brakes
• Yellow Left turn / brakes
• Brown Taillights
º  White Footing

4-Wire Trailer

Annotation: The ground wire colour for a 4-flat plug is white and should exist properly grounded at the trailer tongue. Read the consummate rewiring guide for more.

5-Pin Trailer Wiring Diagram

5-pivot trailer wiring is very similar to 4-pin wiring, simply it adds in a blue wire for the reverse or backup lights.

Not all trailers have reverse lights, so consider your own trailer as you wire in a 5-way plug.

• Blue Opposite lights
• Green Correct turn / brakes
• Xanthous Left turn / brakes
• Brown Taillights
º White Ground

6-Pin Trailer Wiring Diagram

6-pivot trailer wiring introduces 2 new functions, a wire for connecting trailer brakes and a wire for +12-volt auxiliary power.

6-style wiring is nigh common on gooseneck trailers and allows for apply with a brake controller.

• Dark-brown Taillights
• Blue Electric brakes
• Green Right turn / brakes
• Xanthous Left turn / brakes
º White Ground
• Blackness +12 volt

Round seven-Pivot Wiring Diagram

The 7-way round trailer plug is to be distinguished from 7-style RV bract plugs. The wiring connections and placement are different.

Be certain to review your own trailer connector before wiring.

º White Ground
• Brown Taillights
• Green Right turn / brakes
• Red Auxiliary power
• Yellow Left turn / brakes
• Black Reverse lights
• Bluish Electric brakes

RV Blade 7-Pin Trailer Wiring Diagram - SAE

The SAE configuration of a vii-fashion RV blade plug should not be confused with the traditional configuration. Different wire colors are used for unlike functions.

Review your own trailer before wiring.

• BrownishTaillights
• YellowLeft plow / brakes
º WhiteGround
• BlueElectric brakes
• GreenCorrect turn / brakes
• Orange+12 volt
• GreynessOpposite lights

RV Blade vii-Pivot Trailer Wiring Diagram - Traditional

seven-pin trailer wiring is one of the nigh popular wiring configruations, particularly the traditional configuration versus the SAE J2863.

Use this 7-pin trailer wiring diagram to properly wire your 7-pin trailer plug.

• Greenish Taillights
• Ruby Left turn / brakes
º White Ground
• Blue Electric brakes
• Brownish Right plough / brakes
• Black +12 volt
• Xanthous Reverse lights

7-Wire Trailer (RV Blade - Traditional)

Note: Not all trailers are equipped with reverse lights (yellow wire). The position of this wire may vary for your own specific setup.

Trailer Wiring Colors & Diagrams

Note: The basis wire color on all trailer plug types is always white.  Other colors vary in function, depending on the configuration.

Download consummate table

seven-Way RV Bract - Traditional Configuration

• Light-green Taillights
• Red Left plough / brakes
º White Ground
• Blue Electric brakes
• Brown Right plough / brakes
• Blackness +12 volt
• Yellowish Reverse lights

7-Way RV Bract - SAE J2863 Configuration

• BrownTaillights
• YellowLeft turn / brakes
º WhiteBasis
• BluishElectric brakes
• GreenRight turn / brakes
• Orangish+12 volt
• GreyReverse lights

Differences in 7-Pin Trailer Wiring

Traditional configuration

The traditional 7-manner RV blade format is typically used on 5th bicycle trailers, travel trailers and campers. The trailer wiring colors for this configuration are unlike than those on the SAE configuration.

SAE J2863 configuration

The SAE J2863 7-way RV blade format is typically used on gooseneck trailers, utility trailers, cargo trailers and equipment trailers.

seven-Style Round

º White Ground
• Brown Taillights
• Dark-green Correct turn / brakes
• Red Auxiliary power
• Yellow Left turn / brakes
• Black Reverse lights
• Blue Electric brakes

six-Mode Circular

• Brown Taillights
• Blue Electrical brakes
• Green Right plow / brakes
• Xanthous Left turn / brakes
º White Basis
• Blackness +12 volt

half dozen-Way Square

º White Ground
• Red +12 volts
• Blue Electric brakes
• Xanthous Left turn / brakes
• Brown Taillights
• Green Correct plough / brakes

5-Way Flat

• Bluish Contrary lights
• Light-green Right turn / brakes
• Yellow Left plow / brakes
• Brown Taillights
º White Ground

4-Way Round

• Greenish Right turn / brakes
º White Ground
• Yellowish Left plow / brakes
• Brown Taillights

iv-Way Apartment

• Green Correct plow / brakes
• Yellow Left turn / brakes
• Brownish Taillights
º White Ground

Common Connectors by Trailer Blazon

Trailers are equipped with dissimilar plug types based on their electrical components. The chart below provides examples of mutual trailers and the types of plugs they typically apply.

Trailer Type	Mutual Connector Blazon	Alternative Connector Types
Utility trailer	four-way apartment	6-way round	7-mode RV blade
Boat trailer without surge brakes	4-mode flat	7-fashion RV bract (rarely used)
Boat trailer with surge brakes	5-way flat	6-way round	7-way RV bract
Popular up camper	6-way square	half-dozen-way round
Travel trailer	seven-style RV blade	6-way round	seven-style round
fifth wheel trailer	7-mode RV blade	6-mode round
Gooseneck trailer	six-way round	7-way RV bract
Learn more nearly different trailer types hither. Refer to the wiring diagrams above for functions of trailer wiring colors.

Towing 101 Table of Contents

Source: https://www.curtmfg.com/towing-electrical-wiring

Posted by: tobiasfolisn.blogspot.com

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