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CURT 51500 Electric Trailer Brake Controller Wiring Kit

4.3 4.3 out of 5 stars 208 ratings

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Purchase options and add-ons

Brand CURT - DO NOT USE (Use CURA7)
Item Dimensions LxWxH 9 x 6 x 3 inches
Item Weight 2.03 Pounds

About this item

  • SIMPLE TO INSTALL. This universal brake controller wiring kit allows trailer brake controller installation on vehicles not equipped with factory tow package wiring. It comes with blunt-cut wires and terminals to splice into your vehicle's existing wiring
  • RELIABLE POWER. This brake controller wiring harness is constructed with quality 10-gauge wires to ensure consistent power between your trailer brake controller, vehicle and electric trailer brakes
  • UNIVERSAL. This brake controller wiring kit is made for universal application, allowing you to splice your CURT brake controller into a variety of vehicles (brake controller not included)
  • VERSATILE USE. This trailer brake controller wiring is compatible with any CURT trailer brake controller equipped with a quick plug connector. It is intended for use with the CURT wiring harness #51515 or #51516 (sold separately)
  • COMPLETE KIT. This trailer brake controller wiring kit includes components to equip your vehicle for using a brake controller
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From the manufacturer

CURT Brake Controllers and Towing Accessories

Wherever your work or play takes you

CURT offers custom trailer hitches, electrical products and a complete line of towing accessories to get you there with confidence and enjoy every mile of the journey.

CURT Electric Trailer Brake Controllers 5th Wheel

CURT Electrical Trailer Brake Controllers

Simple installation. Sophisticated safety.

CURT offers several different trailer brake controller models to provide you with a solution that fits your unique towing setup and budget. We carry time-based and inertia-based or proportional brake controllers.

All CURT trailer brake controllers are designed for easy installation. Most use our quick plug harnesses, and each comes with its own set of features and benefits.

For a helpful guide in selecting a brake controller, see below.

Key features

  • Multiple styles to fit your needs and budget
  • Fast, easy installation
  • Easily calibrated for all towing needs
  • Time-based and proportional
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Echo Mobile Spectrum TriFlex Discovery Venturer
Customer Reviews
4.3 out of 5 stars
2,467
4.3 out of 5 stars
644
4.2 out of 5 stars
838
4.6 out of 5 stars
1,008
4.3 out of 5 stars
3,411
Activation Method Tri-axis inertia Tri-axis inertia Tri-axis inertia Time-based Time-based
Number of Brakes 2 to 4 2 to 8 2 to 8 2 to 8 2 to 6
Display Smartphone app Tri-color LEDs Digital Digital LEDs
Level Adjust Auto Auto Auto Auto Auto

Inertia-based vs. time-based

Two types of brake controllers:

CURT electric brake controllers fall into one of two categories: inertia-based or time-based. These refer to the method of activation used by the brake controller. Both types are safe and effective for stopping a trailer. However, depending on your needs, one may be preferred over the other.

Inertia-based

Inertia-based or proportional trailer brake controllers use an electronic mechanism, called an accelerometer, to detect the momentum of the vehicle-trailer combination while braking. The controller accentuates the trailer brakes in proportion to the momentum, allowing for a smooth, highly efficient stop.

Time-based

Time-based activation is less complex than inertia-based. When stopping, a time-based brake controller accentuates the trailer brakes based on whatever gain setting is input by the driver. Although simple in operation, time-based trailer brake controllers are effective and provide a more budget-friendly option.

How to select a trailer brake controller

Heavy-duty towing

If you are towing a heavy trailer or cargo, an inertia-based brake controller will provide superior control to make smoother stops and to put less strain on your vehicle.

Light-duty towing

If you’re towing a simple boat trailer or popup camper, a time-based trailer brake controller may be sufficient. CURT time-based controllers are easily adjustable for varying loads.

Frequent towing

If you’re planning to tow often, an inertia-based brake controller is recommended. The sophisticated operation will help prolong the life of your vehicle and trailer.

Occasional towing

If you only plan to tow a few times a year, such as for family camping trips during the summer, a time-based brake controller is an effective and budget-conscious option.

Product Description

It takes a lot of power to stop a moving trailer, especially when that trailer is hauling livestock, construction materials, industrial equipment or other heavy-duty cargo. Play it safe when you tow and give your trailer brakes the control they need with a CURT trailer brake controller and brake controller harness. This brake controller wiring kit is designed for vehicles that do not have an included towing prep package. It includes cables, ring terminals, cable ties and a circuit breaker to splice into your vehicle's wiring system and allow installation of a CURT trailer brake controller. This wiring kit is compatible with systems with up to eight brakes.

Product information

Technical Details

Additional Information

Warranty & Support

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Manufacturer’s warranty can be requested from customer service. Click here to make a request to customer service.

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CURT 51500 Electric Trailer Brake Controller Wiring Kit


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What's in the box

  • Replacement Parts - Undercar;Brakes;automotive-towing-brake-controls
  • Looking for specific info?

    Customer reviews

    4.3 out of 5 stars
    4.3 out of 5
    208 global ratings

    Customers say

    Customers like the ease of installation and performance of the cable assembly. They mention that it works great and that it shows up quick with all parts. However, some customers report issues with the cables and completeness. They say that the duplex wire is only 10 ft. long and that the black and white wire is way too short. Customers also say that they need an additional breaker and that there is not enough wire. Opinions are mixed on quality.

    AI-generated from the text of customer reviews

    4 customers mention4 positive0 negative

    Customers find the installation of the cable assembly to be easy if they are familiar with auto wiring and mechanics. They also mention that the kit comes with all parts and works as it should.

    "showed up quick with all parts, worked as it should.would buy again" Read more

    "Easy to install if you are familiar with auto wiring and mechanics. If not you may want to have it done at local auto repair or RV Camper shop." Read more

    "Absolutely great product. Takes the guesswork out of the lights, simple install." Read more

    "...I have a 2005 Dodge Ram and this kit made the brake controller install too easy!" Read more

    4 customers mention4 positive0 negative

    Customers are satisfied with the performance of the cable assembly. They mention that it works great and the controller works great.

    "I used it to bring power back to my 7 pin plug. Works great" Read more

    "...the installation from scratch was somewhat involved, the controller works great...." Read more

    "This seems to work great. It took me a couple of hours to install it and I am familiar with wiring. I would certainly buy it again," Read more

    "plenty of wire, worked great. Thanks" Read more

    14 customers mention7 positive7 negative

    Customers have mixed opinions about the quality of the cable assembly. Some say that it is a great product, while others say that the wire lengths should be longer.

    "...It’s a good kit for a smaller vehicle but not enough for a full sized truck." Read more

    "...to go from your brake control to the battery compartment, but none left for the run to go to the connector for the trailer...." Read more

    "Great quality kit. Wire lengths should be just a bit longer. I had exactly 2 inches of extra blue wire on my 2013 Chrysler Town & Country install...." Read more

    "...This is not a good choice for a trailer brake set up where you also need to run 12 volts to the trailer battery...." Read more

    21 customers mention2 positive19 negative

    Customers are dissatisfied with the cables. They mention that the wires are too short for a pickup truck, the duplex wire is only 10 ft. long, and the copper pair wire is not long enough. They also say that the item description does not list the wire lengths.

    "Dis the trick. Cables are a little short." Read more

    "This item doesn't have the correct circuit breakers and the duplex wire is too short...." Read more

    "There is not enough wire for a full length pickup, also this only includes the brake wire and the ground wire, the auxiliary power wire that is..." Read more

    "...Another reviewer also flagged the kit for not having enough wire for the 12VDC leg to go back to the trailer adapter plug but for some reason I..." Read more

    6 customers mention0 positive6 negative

    Customers are dissatisfied with the completeness of the cable assembly. They mention that it needs an additional breaker, the copper pair wire is not long enough, and the duplex wire is too short. Some say that the kit is missing a second fuse and an additional automatic circuit breaker.

    "This item doesn't have the correct circuit breakers and the duplex wire is too short...." Read more

    "...It was also short an additional automatic circuit breaker (typically a 40A for the active 12VDC to the trailer battery)...." Read more

    "Kit is missing a second fuse and the black & white wire I way to short idk what car it would work for.. now after I used part of this kit and after..." Read more

    "...not enough no tech screws to secure the one breaker also 2 breakers are needed not one. So the kit is a particle kit." Read more

    Top reviews from the United States

    Reviewed in the United States on December 31, 2023
    Reviewed in the United States on October 28, 2023
    Reviewed in the United States on December 5, 2020
    Reviewed in the United States on October 6, 2022
    2 people found this helpful
    Report
    Reviewed in the United States on July 14, 2016
    Reviewed in the United States on June 19, 2021
    Reviewed in the United States on May 28, 2021

    Top reviews from other countries

    Translate all reviews to English
    jean philippe
    5.0 out of 5 stars Comme décrit
    Reviewed in Canada on March 5, 2021
    MICHAEL C
    5.0 out of 5 stars Excellent.
    Reviewed in Canada on July 13, 2015
    Kevin
    4.0 out of 5 stars Good
    Reviewed in Canada on September 4, 2020
    Ian Shipmaker
    3.0 out of 5 stars Great service, questionable product
    Reviewed in Canada on July 12, 2020
    Dylan Trimble
    5.0 out of 5 stars Five Stars
    Reviewed in Canada on January 28, 2017