Trailer Hitch & Components

  • Trailer Hitch Plug Receptacle Dorman 924-307

    Ships Same Day for orders placed by 4pm ET

    $34.95
    6
    Save 31%
    List: $50.95 Save: $16.00
    Part #: 1AZMX00012

    IN STOCK

  • Trailer Hitch Plug Adapter Curt 57240

    Ships Same Day for orders placed by 4pm ET

    $18.95
    Save 37%
    List: $29.95 Save: $11.00
    Part #: CTTHR00151

    IN STOCK

  • Chevy GMC Cadillac Vehicle Side 7 Way Trailer Wiring Socket Curt 56415

    Ships Same Day for orders placed by 4pm ET

    $29.95
    5
    Save 29%
    List: $41.95 Save: $12.00
    Part #: CTTHR00174

    IN STOCK

  • Ford Lincoln Mercury Trailer Hitch Plug Receptacle Dorman 924-308

    Ships Same Day for orders placed by 4pm ET

    $33.95
    Save 36%
    List: $52.95 Save: $19.00
    Part #: 1AZMX00078

    IN STOCK

  • Chevy GMC Class 3 Receiver Hitch Curt 13322

    PART DETAILS

    • Receiver Tube Size: 2 Inch Receiver
    • Trailer Hitch Class: Class 3

    Ships Same Day for orders placed by 4pm ET

    $174.95
    1
    Save 39%
    List: $286.95 Save: $112.00
    Part #: CTTHR00013

    IN STOCK

  • Lexus Trailer Towing Receiver Hitch Cover Lexus 00228-60966

    PART DETAILS

    Ships Same Day for orders placed by 4pm ET

    $23.95
    Save 39%
    List: $38.95 Save: $15.00
    Part #: LXTHR00001

    IN STOCK

  • Chevy GMC Class 3 Receiver Hitch Curt 13301

    PART DETAILS

    How-to video
    • Receiver Tube Size: 2 Inch Receiver
    • Trailer Hitch Class: Class 3

    Ships Same Day for orders placed by 4pm ET

    $178.95
    Save 39%
    List: $293.95 Save: $115.00
    Part #: CTTHR00012

    IN STOCK

  • Vehicle Side 7 Way Trailer Wiring Socket Curt 55415

    Ships Same Day for orders placed by 4pm ET

    $26.95
    Save 27%
    List: $36.95 Save: $10.00
    Part #: CTTHR00173

    IN STOCK

  • Mercedes Benz Trailer Towing Receiver Hitch Cover Mercedes Benz Q-6-31-0005

    PART DETAILS

    Ships Same Day for orders placed by 4pm ET

    $43.95
    1
    Save 37%
    List: $69.95 Save: $26.00
    Part #: MBTHR00001

    IN STOCK

  • 2009-14 Ford F150 Trailer Wiring Harness Ford OEM 9L3Z-15A416-A

    PART DETAILS

    Ships Same Day for orders placed by 4pm ET

    $99.95
    2
    Save 35%
    List: $154.95 Save: $55.00
    Part #: FDTHR00006

    IN STOCK

  • Toyota Trailer Towing Receiver Hitch Cover Toyota OEM PT22835960HP

    PART DETAILS

    Ships Same Day for orders placed by 4pm ET

    $19.95
    Save 36%
    List: $30.95 Save: $11.00
    Part #: TYTHR00001

    IN STOCK

  • Ford Chevy GMC Class 3 Receiver Hitch Curt 13028

    PART DETAILS

    • Receiver Tube Size: 2 Inch Receiver
    • Trailer Hitch Class: Class 3

    Ships Same Day for orders placed by 4pm ET

    $192.95
    Save 39%
    List: $316.95 Save: $124.00
    Part #: CTTHR00098

    IN STOCK

  • 2005-14 Nissan Frontier Trailer Wiring Harness Nissan OEM 999T8-BR020

    PART DETAILS

    Ships Same Day for orders placed by 4pm ET

    $93.95
    Save 38%
    List: $150.95 Save: $57.00
    Part #: NSTHR00001

    IN STOCK

  • Ford Dodge Class 3 Receiver Hitch Curt 13310

    PART DETAILS

    How-to video
    • Receiver Tube Size: 2 Inch Receiver
    • Trailer Hitch Class: Class 3

    Ships Same Day for orders placed by 4pm ET

    $176.95
    Save 39%
    List: $290.95 Save: $114.00
    Part #: CTTHR00040

    IN STOCK

  • Chevy GMC Class 3 Receiver Hitch Curt 13332

    PART DETAILS

    • Trailer Hitch Class: Class 3
    • Receiver Tube Size: 2 Inch Receiver

    Ships in 1-3 Business Days. Delivery times vary.

    $186.95
    Save 39%
    List: $306.95 Save: $120.00
    Part #: CTTHR00139

Trailer Hitch & Components

What are the trailer and towing parts and where are they located? 

Towing a trailer is a bit more complicated than just hooking the trailer onto a hitch and setting off.  The trailer needs to be hooked up to your truck’s or SUV’s electrical systems.  Once the trailer is hooked up, the trailer brakes and brake lights will go on when you hit the brakes, and the trailer signal lights will go on when you put on the blinkers.  That will help other drivers see what you’re up to and help you get yourself and your cargo safely to your destination. 

There are a couple of important parts that make the connection between the trailer and your truck.  A trailer hitch plug receptacle is where the wiring harness that carries power to the trailer brakes and lights connects.  It is usually attached to the trailer hitch or mounted near it on the bumper. 

The trailer brake control unit is what sends the signal to the trailer brakes to go on when you press the brakes in your vehicle.  It is usually mounted below the dash.  Some trailer brake control modules simply send a signal to apply the electrically operated trailer brakes.  The brakes go on at a pressure and with a time delay that the driver presets.  Others use a pendulum to measure the braking force the truck is undergoing, and adjust the signal to adjust the braking force at the trailer brakes.  

How do I know if my trailer and towing parts need to be replaced?         

If your trailer is losing sync with your truck, then you may need to replace one or more of the towing parts.  The contacts of the trailer hitch plug can corrode if it is left open to the elements or if moisture creeps in.  A bad connection at the plug might mean that your signal lights and brake lights don’t go on when they should.  That leaves other drivers guessing what you’re trying to do with that big boat or camper behind you, which is a stressful situation for them and you.  What’s worse is a bad connection might hinder the operation of your trailer brakes.  Then the trailer might start to sway when you hit the brakes.  If your trailer brake control module isn’t working, it, too, can cause the trailer brakes not to come on, or in some cases to stay stuck on.  You can check that the problem is with the control module and not the connector or the brakes themselves by checking the control modules output voltage with a voltmeter as you apply and disengage the brakes.  The control module should output 12 volts when you apply the brake and no voltage when the brake is off. 

Can I replace the trailer and towing parts myself?  

Installing towing parts is fairly easy.  Towing parts from 1A Auto replace the parts that came with your truck’s factory towing package.  Installing towing parts onto a truck that wasn’t initially set up for towing is a whole different story that involves splicing wires.  Replacing your failed factory towing parts is much more straightforward though. 

For a trailer hitch plug, you’ll just have to disconnect the wiring harness that runs to it and twist it out of the rear bumper.  Then you can twist the new one into place and connect the wiring harness. 

 

The process to replace a trailer brake control module is actually pretty similar.  Unbolt the control module from its position underneath the dashboard, disconnect the wiring harness, connect the wiring harness to the new control module, and bolt it on.  

Choose the Make of Your Vehicle

FAST & FREE
SHIPPING

Same Day Shipping

In stock orders ship same day when ordered by 4pm ET. Need your parts faster? Select expedited shipping at checkout.

QUALITY
AUTO PARTS

Guaranteed to Fit

Our team of auto experts work hard to provide you with the highest quality, direct fit replacement auto parts. We know not all auto parts are created equal. This is why we enforce a strict level of product standards and sourcing with every part.

EXPERT USA
CUSTOMER SUPPORT

USA Customer Support

Our goal is to exceed our customers' expectations every day. We are a team of passionate auto enthusiasts who are here to help. If you have a question about our parts or a repair contact us.

HOW-TO
VIDEOS

Instructional Video Library

Our 1A Auto Video Library has thousands of how-to auto repair installation videos specific to year, make and model. Each video guides you with step-by-step instructions to empower you to tackle your own repairs on your car, truck, SUV, or van.

Go To Top
Loading...