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  1. Custom Fit Vehicle Wiring
  2. CURT
  3. 4 Flat
  4. No Tow Package
  5. Trailer Hitch Wiring
  6. Vehicle End Connector
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2003 Ford F-150
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CURT

Curt T-Connector Vehicle Wiring Harness with 4-Pole Flat Trailer Connector

Part Number: C56310
84 Reviews | 21 Questions
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$68.66
Retail:$100.95
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 Custom Fit Vehicle Wiring
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2003 Ford F-150

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curt custom fit vehicle wiring end connector 4 flat c56310
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curt custom fit vehicle wiring trailer hitch end connector t-connector harness with 4-pole flat
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curt custom fit vehicle wiring trailer hitch plug-in t-connector harness with 4-pole flat connector
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2016 mazda cx-5 custom fit vehicle wiring curt trailer hitch 4 flat c56310
2016 mazda cx-5 custom fit vehicle wiring curt trailer hitch plug-in on a
2016 mazda cx-5 custom fit vehicle wiring curt trailer hitch 4 flat t-connector harness with 4-pole connector
2016 mazda cx-5 custom fit vehicle wiring curt end connector plug-in c56310
2016 mazda cx-5 custom fit vehicle wiring curt end connector 4 flat on a
2016 mazda cx-5 custom fit vehicle wiring curt trailer hitch plug-in t-connector harness with 4-pole flat connector
2016 mazda cx-5 custom fit vehicle wiring curt 4 flat plug-in c56310
2016 mazda cx-5 custom fit vehicle wiring curt trailer hitch end connector on a
2016 mazda cx-5 custom fit vehicle wiring curt end connector 4 flat c56310
2016 mazda cx-5 custom fit vehicle wiring curt trailer hitch end connector t-connector harness with 4-pole flat

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Quickly and easily install a 4-way trailer connector on your vehicle with this custom harness. T-connector plugs directly into existing wiring. Powered converter reduces strain on wiring system and is made using SMT to ensure superior performance. 1-800-940-8924 to order CURT custom fit vehicle wiring part number C56310 or order online at etrailer.com. Free expert support on all CURT products. Great prices and Fastest Shipping for Curt T-Connector Vehicle Wiring Harness with 4-Pole Flat Trailer Connector. Custom Fit Vehicle Wiring reviews from real customers.
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CURT Custom Fit Vehicle Wiring - C56310

Highlights

  • Custom Fit for Your Vehicle: Works with your vehicle's wiring
  • Plug-and-Play Install: T-connector plugs inline with tail lights—no splicing needed.
  • Protects Vehicle Electronics: Powered converter draws trailer light power from battery, not tail lights.
  • Ready for LED Trailers: Works fine with LED lighting setups for reliable signal output.
  • Prevents Overload Issues: Isolates sensitive circuits to avoid problems with the vehicle’s BCM.
  • Clean Routing Option: 4-flat plug can mount outside or store inside cargo area when not in use.

Features to know about

Protects Vehicle Electronics: Powered Converter

Trailer lights can overload delicate vehicle wiring if power is pulled directly from the taillight circuits. This harness uses a powered converter that draws power straight from the vehicle battery instead. It keeps the electrical system safe from overloads or short circuits while still powering the trailer lights reliably.

Plug-In Setup for Easy Install: No Cutting or Splicing

Instead of stripping wires or chasing circuits, the T-Connector simply plugs into the factory tail light connectors. Once connected, you just run the single hot lead to the battery. The plug-in design keeps things clean and lets you hook up a 4-flat trailer connector without altering the factory wiring.

Handles LED Trailer Lights Without Issue: Works Across Lighting Types

This harness works with both standard incandescent and LED trailer lights. The built-in converter ensures proper signal flow and voltage, so your trailer lighting functions as expected no matter what bulb type it uses.

Keeps Wiring Tidy and Protected: Hidden 4-Flat Connector

The flat 4-way plug can be routed outside near the hitch or stored inside when not in use. That keeps it out of the weather and away from damage when you’re not towing, giving you a clean look and longer-lasting connections.

Specs

  • Image: Comparison image showing Curt trailer wiring harnesses with labeled connectors, used to illustrate compatibility differences for Mazda CX-5 models.

56310 Curt T-Connector Vehicle Wiring Harness with 4 Pole Trailer Connector

Installation Details C56310 Installation instructions

This Product Fits The Following Vehicles






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Ratings & Reviews

4.8

84 reviews
5 Stars
(67)
4 Stars
(14)
3 Stars
(2)
2 Stars
(1)
1 Star
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by:
It was easy to set up and it has been working like a charm. The printed instructions and the videos were very helpful and clear. A very good improvement from the older I had on my trailer, no doubt.
Maurizio profile picture

Maurizio

5/8/2026

It is still working like a charm. No issues whatsoever. Thank you.

Gwendolyn Y. profile picture
Etrailer Expert

Gwendolyn Y.

5/8/2026

@Maurizio That's great to hear!
by:
2016 Mazda CX-5
I bought the C56310 trailer hitch and the recommended wiring harness for my 2016 Maxda CX 5. I jacked the back of my car up and installed it in my garage. Everything went together smoothly with no issues. Between the hitch and wiring it took under two hours. My local trailer place wanted almost $600 for the hitch wiring and installation. I spent $**. Excellent support videos and online support. Quality product.
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Bill. M. profile picture

Bill. M.

7/20/2017

I use my hitch weekly for towing my boat. I have had zero issues. Everything was easy to install and works perfectly. I have not seen a factory installed hitch on a Mazda CX-5 so when others see it they ask me where I got it and I always recommend ETRAILER.

by:
2016 Mazda CX-5
Packaging was destroyed by the hitch frame that i had also ordered and were shipped together in the same box. There was stuff scattered everywhere and i’m still hoping im not missing anything.
by:
After gathering my tools up and setting my timer it took me 90 minutes to get this job all buttoned up. The instructions were clearly written with good pictures. I would add a wire fishing tool to the recommended tools list though.
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by:
2016 Mazda CX-5
I purchased the wiring harness along with a 2" hitch, as well as a Hollywood Racks bike rack. The videos for all three items made the installations easy. I purchased the hitch shortly after purchasing a Mazda CX-5, primarily for use with a bike rack. I went ahead and purchased/installed the harness at the same time so that if and when I need it for towing, I'm ready to go. This harness, slaving off the battery for power directly, versus the lights, made sense - brighter, no concerns of blowing fuses, etc.

On a side note, I really like my Hollywood Racks bike rack - it holds bike snug, it's secure, it's easy to mount, and best of all, I can switch from a two bike mount to 4 bikes in maybe 5 minutes.
Eric profile picture

Eric

6/11/2018

I haven’t actually used the wiring harness as of it, so nothings changed as far as my review goes. That said, we moved to Germany later last year, and trailer lighting requirements including bike racks that reduce visibility of rear tail lights and license plate require lights and plates be attached to those extensions. Bike racks available here now only come with lights and room to attach a plate, but the hitches are different. SO, I will be purchasing some trail tail lights and a harness soon and building a basic light and license plate board that I’ll hang attach to the bike rack I also purchased. I’ll be sure to seek help as necessary, and intend to purchase from etrailer. Will be in touch.

Rachael H. profile picture
Etrailer Expert

Rachael H.

6/12/2018

I have provided a link for your reference that includes all the trailer light kits that we currently offer. Some of the kits include the license plate bracket, additional lights, and reflectors so you can choose what may be needed based on your needs.
by:
This is a true plug and play adapter for your trailer lights. It takes more time to remove the panels than it does to install the adapter. It works with my 2016.5 CX-5 that has partial LED lighting. Power is available in the rear from the 12V power outlet that is always hot and has a 15A fuse. There is a body ground behind the left tail light, just perfectly placed. Below and behind the left tail light is a flat spot and a natural place to put the control box. DON'T use it; the trim panel will not fit with the box there. Tuck the control box behind a flange just to the rear of that perfect place for the box.
John profile picture

John

8/28/2018

Not much to say after a year. It works great! Has not caused any problems with the tail lights or car. Perfect as can be.

by:
Product was as expected and as described. Easy to install. Used to tow a utility trailer by Jeep Cherokee, a alwn mower at times and was used once to haul load of furniture in my son's move. Would recommend it to persons needing an after market towins setup.
Lanier profile picture

Lanier

6/7/2021

Continues to work well with no problems.

by:
This is a replacement for my previous Curt harness / adapter, which developed an intermittent fault in the running lights after several years of use. After troubleshooting I concluded the fault was interior to the module, which is sealed and not possible or practical to repair--so I replaced it.
Paul profile picture

Paul

5/15/2023

This replacement developed the same intermittent fault in the running lights almost immediately. Purchased a different brand, can’t recommend at this point.

by:
* Wiring harness works great, no problems so far after 1 year.
* Easy to install if wiring doesn't scare you. Plug and play makes it simple. I elected not to run the 12V line all the way from the trunk to the battery so I connected the 12V line to a cigarette lighter plug and then plug this into my accessory port located in the rear cargo area. I dont use the trailer all that often so simply plugging/unplugging this cigarette lighter in each time is no big deal. The CX-5 cargo area accessory socket is already fused for 15A so there should be no problem with the LED trailer lights I'm running.
* I have purchased several CURT trailer hitches and wiring harnesses over the past several years and have been very pleased.
* etrailer has also been very easy and professional to work with. Their website is outstanding with videos and instructions to review items before you buy to see what the installation will entail. I wish other websites were as thorough.
*Wont hesitate to buy again from etrailer.
by:
2016 Mazda CX-5
The wiring harness fits perfectly, and was super easy to install. I have no complaints, and the team at etrailer.com were great to work with, super fast service!
Jeffrey D. profile picture

Jeffrey D.

11/2/2018

Fantastic, no issues!

by:
Fix perfectly, but I ran the power cord inside instead of following the instructions. It fit under the trim and there was a “spare” grommet to run it through the firewall. Overall I’m very happy with the whole transaction! Thanks again etrailer!
Gord profile picture

Gord

4/2/2019

No issues, I’m happy! I kept all the wiring inside so it doesn’t get exposed to snow and salt.

by:
I've had this on my Mazda CX-5 for the past year, I've used it numerous times, hauling one dirtbike on a hitch carrier, hauling multiple large motorcycles on a Kendon Motorcycle Trailer, and also using my No-Mar tire changer on it as well. It's been super durable and problem free. Hoping for many more years of quality use out of it.
by:
One year review. Great buying experience. Very easy install, clear instructions, and great video explaining the steps. No complaints. Works as intended. I tapped into 12volt accessory plug in trunk; etraier doesn’t recommend because of safety reasons. Their logic made sense; I had my reasons. I don’t recommend it for others unless you know what you’re doing.
by:
Product works and instructions were pretty good. Instructions could have been a little better on some points: 1) Routing power wire to the battery could use a suggested route. 2) No mention of the access panels that are available on 2016 CX-5, which makes getting to the rear light sockets a breeze. 3) Suggest a good place to attach the control module so the harness doesn't end up too short to reach the hitch area.
I found a YouTube video that filled in the gaps.
by:
Perfect, no issues installing this harness. Plenty of wire and the connections make it hard to do wrong. Nothing to splice or cut, just unplug your taillights and connect the harness.
by:
2016 Mazda CX-5
We were very pleased with our order from etrailer (hitch receiver + wiring). They took the time to ensure the wiring harness didn't rattle around in the package with the receiver and filled our order in record time. While we will be only using it occasionally, having an easy to install tow package will help us move those bulky loads with ease. Thanks etrailer!
by:
2016 Mazda CX-5
The module in my original Curt wiring harness went bad after 3 years which was a real disappointment as I hate installing these things. Didn't have much choice, so I ripped my interior apart (again) to remove the old module/harness and install the new one. It would have been easier if the harness plugged into the module, so that just the module could be swapped out, but everything is hardwired. A few hours later the job was done. I like that the harness plugs right into the existing tail light connectors: no splicing into car's wiring harness. I did not run a new wire to the battery and just spliced into the existing one from the original install.

The instructional video from eTrailer was great and they are a pleasure to do business with. I'm still annoyed the original module went bad, but life happens.
by:
2016 Mazda CX-5
This is the third hitch that I have purchased from etrailer.com. All have been exactly as ordered and, although I have not had time to install the new hitch, I am certain it will fit. The detailed installation instructions and online videos make it impossible not to do it correctly and easily. The same goes for the wiring harness that I ordered. I have never installed one before but, after watching the video, it looks like a piece of cake.
by:
2016 Mazda CX-5
I purchased the hitch bracket and the wiring harness for a Mazda CX5. Was very satisfied with the quality of the product. Both packages were complete without parts missing. Installation went very smoothly, recommend two people to install the hitch as it is cumbersome trying to hold it in position and start the nuts on the bolts. Very satisfied with the end result.
by:
2016 Mazda CX-5
The wiring kit was a breeze. If your mechanically inclined it should be easy for you. The instructions are clear, shipping is fast and the website layout is great. Good job etrailer.
by:
2008 Ford Escape
Everything arrived on time and well packaged. The wiring install went exactly as described in both the written and video instructions. The main reason I purchased from etrailer.com was the quality of the information on the products and installation. Couldn't be happier with the process from beginning to end. And the new hitch and wiring looks and works great!
by:
2016 Mazda CX-5
Fit and works perfectly
by:
This harness was purchased for my grandsons vehicle. As far as know it has worked great. As far as installation ? He installed it. I didn't hear any complaints.
Great products !!!!!
by:
2016 Mazda CX-5
Easy to install. The etrailer product video was extremely helpful for me, since I have limited experience with wiring.
by:
As good as the product itself are the videos available pertaining to the installation of the product and related items. I viewed them all. Excellent subject matter with complete instructions.
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See what our Experts say about this CURT Custom Fit Vehicle Wiring

Do you have a question about this Custom Fit Vehicle Wiring?
  • Troubleshooting Trailer Lights Not Working Towing With Mazda CX-5
    There can be issues like this on some trailers using LED lights where they don't work at all. More than likely your LED lights aren't drawing enough power and this is the reason the tester works but not the lights on the actual trailer. This also varies between vehicles which would explain why it works on the truck and not your CX-5. In order to simulate more current draw, you can use load resistors like the # DI34ZR. You will need one per circuit so in this case 3 for the right turn/stop,...
    view full answer...
  • Wiring Harness For 2016 Mazda CX-5
    Yes we can help. Wiring modules can't be replaced though, so you'll have to get a new trailer wiring harness for your 2016 Mazda CX-5, the T-Connector Vehicle Wiring Harness with 4-Pole Flat Trailer Connector # C56310.
    view full answer...
  • Should Power Wire of Trailer Harness for 2016 Mazda CX-5 Run to Battery
    On some vehicles like your 2016 Mazda CX-5 it has been determined that the electrical system cannot or should not handle the load from its own tail lights and the trailer lights as well so they need a powered converter. These converters like the Tow Ready Wiring harness part # C56310 get power for the trailer lights primarily from the vehicle battery. This protects the vehicle electronics. They only use your vehicle taillights as signal wires. If you ran the wire to the power source you...
    view full answer...
  • Why Does Trailer Wiring for a 2016 Mazda CX5 Have to Run to Vehicle Battery
    The reason the Curt Custom Fit Vehicle Wiring # C56310 has a power wire is to protect the delicate tail light wiring circuits of your vehicle from being overloaded. The Curt Trailer Harness # C56310 that you referenced uses your tail light circuits as signal wires and then draws the power to illuminate the tail lights of your trailer directly from your vehicle battery through the battery wire of the box. Not doing this will void the warranty of the kit. I attached installation instructions...
    view full answer...
  • Curt Trailer Wiring Harness # 56310 Not Fitting 2016.5 Mazda CX-5
    It is possible that the tail light connectors on your 2016.5 Mazda CX-5 are the same as what is on the 2017 models. If that is the case it would take harness # C56377. Take a look at the connectors for this harness to see if they match up to what is on your vehicle. If not, then the only other option is to use a universal wiring harness such as # 119250KIT and splice it into the tail light wiring on the vehicle. You should not have to break any tabs or modify anything to get a T-connector...
    view full answer...
    Image 1 for
  • Recommended Class 3 Hitch For A Mazda CX-5 For Hauling Heavy E-Bikes
    For a 2016 Mazda CX-5 I recommend the etrailer Trailer Hitch Receiver # e98902. This trailer hitch has a 600lb tongue weight capacity so you'll be able to haul your heavy e-bike(s) around with no problem. You will want to check the owner's manual for your CX-5 to ensure you don't exceed the vehicle's capacity though. This hitch has a matte black finish that help to hide scratches and scrapes, unlike gloss coatings. The installation is pretty straight forward as well so you can follow Rob's...
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  • Does the Curt T-Connector C56310 Fit a 2016.5 Mazda CX-5
    The Curt T-Connector Vehicle Wiring Harness with 4-Pole Flat Trailer Connector # C56310 is in fact the correct trailer wiring kit for your 2016.5 Mazda CX-5. It will work with the LED lights on your trailer. I have attached a video of this kit being installed on a similar CX-5 that you can use as a reference. If you do not already have a hitch receiver on your CX-5 then I recommend installing the Draw-Tite # 76138 as it has a 2 inch hitch receiver which is compatible with many more applications...
    view full answer...
  • Trailer Wiring Harness Recommendation For 2016 Mazda CX-5
    According to my contact in the Tech Services department at Curt Manufacturing, the correct taillight wiring harness for your 2016 Mazda CX-5 is part # C56310. The # C56310 uses the same plugs as the C56011, but the C56310 is a powered converter that draws the power to illuminate the trailer lights directly from the vehicle battery. Curt's engineers found during testing that due to the high amperage draw when the non-powered wiring harness C56011 was used, problems occurred with the vehicle's...
    view full answer...
  • Does Trailer Wiring for 2016 Mazda CX-5 Require Running Wire up to Battery
    Yes, the trailer wiring kits that fit your 2016 Mazda CX-5 like the Curt # C56310 that you referenced do require running the power wire up to the vehicle battery. This is true for all kits that fit your vehicle as well as taillight configurations.
    view full answer...
  • Which Curt Trailer Wiring Harness Fits 2016 Mazda CX-5
    For the 2016 Mazda CX-5 the correct Curt trailer wiring harness is the part # C56310, the part # C56011 that you referenced was a fit for the year prior but the vehicle taillight connectors changed in 2016 so they had to release a new wiring kit. I attached an install video for this harness for you to check out as well.
    view full answer...
  • Recommended Mounting Bracket for 4-way Wiring Harness on a 2016 Mazda CX-5
    I can help you figure out a way to conveniently store your wiring harness # C56310 when not in use on your 2016 Mazda CX-5. It sounds like your mechanic ran the 4-way out of the vehicle and its hanging just below the hitch. For this I recommend a no-drill mount bracket like # C57202 and 4-way mounting bracket # 18144. I have linked a video of our installer installing this bracket on a similar hitch if you skip to the 13:42 minute marker, he will show you how this can be installed on...
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  • Can Parts To Tow Trailer With 2016 Mazda CX-5 Be Transferred To Another Vehicle
    I do have some great options for a 2016 Mazda CX-5 but most of these options (trailer hitch and basic wiring) are all designed specifically for said vehicle (custom fit) which is what allows you to install them without drilling into the frame or splicing into the vehicles wiring harness. I have attached a list below but some will be able to be transferred (universal fit). Draw-Tite Max-Frame Trailer Hitch Receiver part # 76138 (Custom Fit) Curt T-Connector Vehicle Wiring Harness part #...
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  • Tips for Running Power Wire of Curt Trailer Wiring Harness on a 2016 Mazda CX-5
    I don't have specific instructions for the power wire but when routing a power wire for a powered converter like the part # C56310 the key is to route the wire away from any moving parts or exhaust that would get too hot and melt the wiring. If you can run the wire down a frame rail that would be ideal since that would protect the wiring somewhat. I attached a help article that covers how to route the power wire for a converter.
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  • Which Receiver Has Best Height and Bumper Clearance for 2016.5 Mazda CX-5
    The Curt Trailer Hitch Receiver Item # C12170 is the hitch recommended to tow your small lightweight boat. It has a 1 1/4" receiver opening and is a confirmed fit for your 2016.5 Mazda CX-5. it has a maximum gross trailer weight of up to 3,500 lbs and a maximum tongue weight of up to 350 lbs. (Be sure to check your owners manual for vehicle towing specs). The Curt Trailer Hitch Receiver has great clearance. From the center of the hitch pin hole to the outermost edge of the bumper right...
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  • Recommended Class III Trailer Hitch & Wiring for 2016.5 Mazda CX-5
    We just recently confirmed with Curt that their 2-inch Class III hitch # C13315 will indeed fit the mid-year version of the 2016 Mazda CX-5. The noted fit exclusion was temporary, until Curt engineers could get their hands on the 2016.5 to test fit this hitch. Our hitch pages will be updated shortly. If you also need a 4-pole wiring harness you can use Curt kit # C56310. This is illustrated in the linked review video and the linked article will assist your installation.
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  • Curt Trailer Wiring Harness on 2016 Mazda CX-5
    The # C56310 is the confirmed fit to work with all models of the 2016 Mazda CX-5. I verified with Curt that the # C56011 is compatible up through 2015 but will not work on the 2016 with or without LED lights. The connector used on the 2016 is different.
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  • Is Drilling Required To Install the etrailer Hitch e98902 On a 2016 Mazda CX-5
    The etrailer Trailer Hitch Receiver part # e98902 which is a fit for a 2016 Mazda CX-5 does not require any drilling into the frame. There is also no trimming required for installation so there will be no permanent modifications. The trailer hitch is very easy to install, taking most only 30 to 40 minutes. If you will be towing then you'll also need the Curt T-Connector Vehicle Wiring Harness part # C56310 which is plug-n-play and the etrailer Ball Mount Kit part # 989900 which has all...
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  • Availability of Trailer Hitch & Wiring for 2016.5 Mazda CX-5
    We just recently confirmed with Curt that their 2-inch Class III hitch # C13315 will indeed fit the mid-year version of the 2016 Mazda CX-5. The noted fit exclusion was temporary, until Curt engineers could get their hands on the 2016.5 to test fit this hitch. If you also need a 4-pole wiring harness you can use Curt kit # C56310. This is illustrated in the linked review video and the linked article will assist your installation. Several helpful videos and articles are linked for you.
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  • Trailer Hitch Receiver and Wiring Harness for 2016.5 Mid-Year Model Mazda CX-5 with LED Lights
    Neither hitch receiver require a particular wiring harness. The wiring harnesses recommended match the manufacturer of the hitch. With Curt Hitch # C13315 we recommend Curt Wiring # C56310. With Draw-Tite Hitch # 76138 we recommend Tekonsha Wiring # 118563. Draw-Tite and Tekonsha are owned by the same parent company. Technically either wiring harness can be used with either hitch and they both work with LED lights. Curt does require a support strap # 18050 when carrying a bike rack...
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  • Trailer Hitch Receiver & Vehicle Wiring Harness For a 2016 Mazda CX-5
    I recommend using the etrailer Trailer Hitch Receiver # e98902 on your 2016 Mazda CX-5. This is the correct receiver for your prior to 2016.5 model year. I prefer our receiver as it has a matte black finish that better matches with the fascia trim on your CX-5. I have linked an install video below which will help you see how it will look on your vehicle as well as help you decide if this is a project you prefer to install yourself or take to a shop to have completed. The Curt T-Connector...
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  • T-Connector Vehicle Wiring Harness For 2016 Mazda CX-5 With LED Lights
    The correct Curt wiring harness for your 2016 Mazda CX-5 is part # C56310. The connectors changed between 2015 and 2016 for the CX-5 and the # C56011 will not work with your 2016. Per my Curt contact, the # C56310 will work fine with the LED lights on your CX-5. You just need to access the wiring connection points in the rear cargo area and then run a hot lead to the car battery. This harness includes a tail light converter that keeps the electrical system on your vehicle from being overloaded.
    view full answer...

Do you have a question about this Custom Fit Vehicle Wiring?


Info for this part was:

Employee Jackie C
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Employee Mike L
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Employee Jameson C
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Employee Jeffrey L
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Employee Lindsey S
Edited by:
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