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

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

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Custom Fit Vehicle Wiring

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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 - no cutting, splicing or tapping required. 1-636-306-4830 to order CURT custom fit vehicle wiring part number C56161 or order online at Free expert support on all CURT products. Guaranteed Lowest Price 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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  • Reviews (178)
  • Q & A (0)
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  • Why etrailer?

CURT Custom Fit Vehicle Wiring

  • Custom Fit
  • Trailer Hitch Wiring
  • 4 Flat
  • Powered Converter
  • CURT

Quickly and easily install a 4-way trailer connector on your vehicle with this custom harness. T-connector plugs directly into existing wiring - no cutting, splicing or tapping required.


  • Provides a 4-way flat trailer connector at the back of your vehicle to power your trailer's signal lights
    • Compatible with 5-pole, 6-pole and 7-pole adapters (sold separately)
  • Includes a tail light converter to ensure that your vehicle's wiring matches that of your trailer
  • Constructed using surface-mount technology (SMT) for consistent, reliable performance
    • Maximizes trailer light yield and intensity while producing minimal heat
    • Ensures superior operation in rough road conditions
  • Connects quickly and easily - no cutting or splicing of wires
    • Locate connection in rear cargo area
    • Plug in T-connector
  • Comes with dust cap for 4-way flat connector
  • Limited 1-year warranty


  • Maximum amperage:
    • Stop/turn lights: 5 amps per circuit
    • Tail lights: 5 amps per circuit
  • Limited 1-year warranty


This custom-fit T-connector plugs into your vehicle's electrical junction box, which is located in your rear cargo area, beneath the trim panel on the passenger's side

Once installation is complete, the 4-way connector will be stowed in an out-of-the-way location within your cargo area.

It is recommended that you use a small amount of grease on all electrical connections - the plugs on your automobile and the 4-pole connector itself - to help prevent corrosion.

Tail Light Converter with Surface-Mount Technology

A tail light converter is built into this T-connector. Because most trailers run on a two-wire system - wherein the brake and turn signals are carried on one wire - the separate brake and turn signals from your vehicle's three-wire system need to be combined so they are compatible with the wiring system of the trailer. This converter combines the brake and turn signal functions of your automobile so that they run on one wire to properly activate your trailer's tail lights. Note: This will not affect how the tail lights on your vehicle operate.

Curt builds each tail light converter using surface-mount technology (SMT). This method of construction involves soldering electronic components directly to the surface of a printed circuit board. SMT eliminates the need for leads, which are used in older through-hole technology. The result is a circuit board that is smaller yet provides more routing area and that offers superior performance, reliability and durability.

Curt SMT Circuit Boards

Circuit boards constructed using SMT have been shown to perform better under rough conditions with excessive vibration than those made using the through-hole method. And where would vibration be more likely to occur than in towing applications? Curt converters also produce less heat, leading to increased durability and longer life. In addition, lower levels of resistance ensure better performance, especially for parts that operate at higher frequencies.

56161 CURT T-Connector - 4 Wire

Item # C56161

Installation Details C56161 Installation instructions

This Product Fits The Following Vehicles

California residents: click here

Customer Reviews

Curt T-Connector Vehicle Wiring Harness with 4-Pole Flat Trailer Connector - C56161

Average Customer Rating:  4.9 out of 5 stars   (178 Customer Reviews)

Quickly and easily install a 4-way trailer connector on your vehicle with this custom harness. T-connector plugs directly into existing wiring - no cutting, splicing or tapping required.

2005 Honda Odyssey

This is a great hitch! It's well made and bolted right onto my Honda Odyssey. I'm using my hitch to tow a small trailer for getting rid of yard debris. Now I don't have to go out and by a truck. This was very easy to install and it came with everything needed!

2007 Honda Odyssey

Ordered it with hitch receiver. Delivered together, well packaged. Installation was simple. Followed video and everything went according to direction. Have not had opportunity to test it on trailer, but I'm confident it will work.


The trailer hitch arrived and I'm really impressed the hitch is made of nice quality metal also the wiring is of quality not thin wiring or metal hitch very very happy


Shipped on time. Arrived when expected. Instructional videos spot-on installation was straightforward. The only discrepancy was 7.5 amp fuse noted in the videos but at 10 and included for the fuse panel instead of a 7.5. I installed 10 amp and everything seemed to work out fine on my multimeter when I checked the circuit.

2010 Honda Odyssey

Great hitch and the wiring harness was easy to connect as well

2010 Honda Odyssey

This was an easy to install product. I followed the instructions up to the placement of the end of the 4-pole connector. I routed mine into the bumper so I could leave a 7 pole connected to it more permanently.


Very easy installation (plug and
just follow video and had no problems!!

2010 Honda Odyssey

I purchased the trailer wiring kit for my 2010 Honda Odyssey.The ordering process, shipping, installation went well. haven't had any problem from beginning to now, 1 year later.

Still working great
Jim L - 05/11/2021

2009 Honda Odyssey

I love your website and doing business with you was about as good as any I’ve done anywhere. Plenty of helpful info, easy to search and navigate, checkout was straightforward. I sure wish other places were this helpful and easy (and fast!) Maybe you could market your platform and concepts...
Best of all, the product arrived fast, in good condition, and installed exactly as described. Oh yeah, love the detail and variety of the videos too!

Thanks again!

Works great after a year and a cross country move, no trouble at all. Finally figured out why the pigtail is so’s supposed to be routed under the trunk threshold trim piece so you can stow the pigtail in the tire jack compartment on the left side of the van. Dunno how I missed that in the instructional...d’oh.
Ian - 01/22/2020


The times I used it have been great. I'm not planning to tow much with my van, but it's been good so far. I wired it so that it sits in the jack compartment in the back of the vehicle and it is easy to pull out and use as needed.


Easy to install. Only used it a few times but works exactly as expected.

2008 Honda Odyssey

Good deal for a 4 pin connector that comes assembled to just plugs into the open connector on my 2008 Honda Odyssey. Online videos are super with helping get to the connector, grounding, panel removal and grounding. No need to hassle with finding wires in the van that require tapping. Plug it in, add a fuse & you're good to go.


My sons, ages 11 and 13 installed it in about a half hour. They watched the video on their phones, I pointed to the tool chest in the garage.
A year later, the company is following through. I can’t think of a single important they could make.
Etrailer, great company.


Noah answered all my questions & even helped me when I put a wrong address in! Excellent customer service, thanks so much Noah!!

2006 Honda Odyssey

I just love it . The hitch and wiring system took a little more than an hour to install . It looks great too ! I can't wait to use it . Thank you

2005 Honda Odyssey

I have a 2005 Odessey, this wiring harness was simple and made with high quality parts. I watched the install video and made it extremely easy to install. I called the Honda Dealership prior to seeing this item and there price was 4x higher and would take a week to get. I ordered this part and it was delivered in 2 business days.

Very Pleased with Thank you!

Still the easiest and cheapest way to get a wiring harness on my Odessey.
Jeff P - 05/03/2015


Awesome value! Everything provided for the installation, plug and play.
Installed on 2007 Honda Odyessy.

2006 Honda Odyssey

Easiest install, just follow instructions provided

2009 Honda Odyssey

I installed this wiring harness to my 2009 Honda Odyssey. The Curt wiring harness is quality built, a great price and very easy to install. The video was extremely helpful for visual learners like myself. The shipping was fast and the service from etrailer was exceptional.

Still works like it should. In fact I just moved from Fort Hood to Las Vegas and pulled my bike trailer with no issues in the wiring or signaling. I appreciate the follow-up.
Scott R - 10/20/2014


The item and your service and price were excellent, I never buy elsewhère


Well it's been a year and it's still working perfectly and the materials show no wear at all, easy to install, literally minutes, durable and reliable what else could one want?


Always purchase are trailer hitch's for are customers!


Plugged into vehicle wiring, no splicing. Detailed instructions and fast shipping. I would definitely do business with company in the future.

2015 Honda Odyssey

This is the second harness I put in my Honda Odyssey. The instructions are clear and etrailets install video made this about a 15 minute job. My lights all work again and I'm a happy camper.

All is well, your products have never disappointed!
Tom G - 07/17/2018

2008 Honda Odyssey

Incredibly easy to install, with the instructions it took me less than 10 minutes. The 4 pin connecter that goes to the trailer has enough wire that I was able to run it through the inside of the panels and keep the connecter inside the van when I am not using it keeping it from the weather and corrosion. I originally bought it so I could rent a uhaul trailer and the wire is long enough that I didn't need an extension to the 4 pin for the lights.

Show More Reviews

See what our Experts say about this CURT Custom Fit Vehicle Wiring

  • Should Curt Trailer Wiring Harness 56161 for 2010 Honda Odyssey have Constant Power with Van Off
    That does seem to be normal for powered converters, especially from Curt. It will not cause any problems unless you have something plugged into the # C56161 harness on your 2010 Honda Odyssey that draws power. You can double check the connections and make sure there are no bent or broken pings, corrosion in the connections, or corrosion at the ground location. Any of these things could cause a short.
    view full answer...
  • Purpose Of Converter Or Powered ModuLite On A 4-Pole Flat Trailer Connector
    The converter or (Powered ModuLite) reduces strain on the wiring system. It is a recommended feature to make sure your product stays working for an extended period of time. A powered converter is required to protect the vehicle's sensitive electronics on models not equipped with a tow package. It is recommend that you have a converter so it will keep the integrity of or product intact for an extended period of time. I recommend the Curt T-Connector Vehicle Wiring Harness with 4-Pole Flat...
    view full answer...
  • 4-Way Trailer Wiring Harness Recommendation for 2008 Honda Odyssey
    For a 4-way wiring harness confirmed as a fit for your 2008 Honda Odyssey we have the Curt trailer wiring kit part # C56161 which would fit and work well.
    view full answer...
  • Troubleshooting Malfunctioning Trailer Wiring Harness on 2009 Honda Odyssey
    According to your description, it sounds like the converter is shot, allowing output on incorrect circuits. The vast majority of the time, the failure of the converter is caused by a short circuit of some kind in the trailer wiring. Before replacing the trailer wiring harness with a replacement like the Tow Ready # 118438, you'll want to closely examine the wiring on your trailer to find the short. If you don't locate and repair the short, you will continue to blow up wiring harnesses....
    view full answer...
  • Troubleshooting Damaged Trailer Wiring That is Causing Vehicle Fuses to Blow in Honda Odyssey
    Damaged trailer wiring, such as worn insulation that can cause a short, should be repaired before you replace your vehicles fuses or chances are that you will be doing that regularly. In some cases a short on a trailer can damage a tail light converter, such as the Curt T-Connector Vehicle Wiring Harness # C56161 that you referenced. Check your trailer wiring all the way from the connector to the light fixtures themselves. Inspect the wires for cracked or worn insulation, especially in...
    view full answer...
  • Install Video Availability of the Curt Wiring Harness part C56161 on a 2010 Honda Odyssey
    I can provide you with a video of different brand's wiring harness that will install the exact same as the Curt Custom Fit Vehicle Wiring # C56161 that you referenced. The video I attached shows the Tow Ready Wiring Harness # 118438 being installed on a 2010 Honda Odyssey just like yours.
    view full answer...
  • Can Trailer Wiring Harness be Routed and Mounted Outside of a 2010 Honda Odyssey
    For trailer wiring harnesses that have the connector stored inside the vehicle you will just need to pull it out when needed and you can close the rear hatch on the wiring and the weather stripping will protect it. Stay away from the locking mechanism though. These harnesses were not meant to be routed permanently outside of your 2010 Honda Odyssey. If you wanted to do that any way you would need to remove the flooring getting down to the bare metal of the cargo area. Then you will need...
    view full answer...
  • No Lights On Trailer When Using Curt Custom Wiring # C56161 On 2010 Honda Odyssey
    You will want to check the converter of the Curt Custom Wiring, part # C56161. Use a circuit tester, like part # 40376 to check to make sure there is power going into the converter. Then check to see if your are getting power coming out of the converter. If you are not getting power coming out of the converter, it may need to be replaced. Also, I would check the vehicle side connector to make sure there is not any corrosion in the connector which could be causing a bad connection.
    view full answer...
  • Trailer Wiring Harness Recommendation for a 2007 Honda Odyssey
    Honestly, either the Curt Custom Fit Vehicle Wiring # C56161 or the Tow Ready Custom Fit Vehicle Wiring # 118438 would work for you since they basically do the same thing. However, Curt uses a more modern style circuit board that builds less heat and generally lasts longer than the style of circuit boards that are in the Tow Ready converters so I would go with the # C56161. I attached installation instructions for the # C56161 for you to check out also.
    view full answer...
  • Comparing Trailer Wiring Harnesses for a 2008 Honda Odyssey
    The Curt wiring harness # C56161 and the Tow Ready wiring harness # 118438 for the 2008 Honda Odyssey install the same way. Both install behind in a junction box located in the cargo area of the van. This is an ideal setup because it uses the factory location on the vehicle. The Curt harness actually uses a newer technology inside the converter box. Both harnesses would work well for you. I have linked instructions and a video for you.
    view full answer...
  • LED Trailer Lights Illuminate Even When No Lighting Function Is Activated on the Tow Vehicle
    It is not uncommon for some trailer wiring harnesses like the Curt # C56161 to pass a small amount of power even when no vehicle light function is activated. If used along with super-efficient LED-type trailer lights this can result in low-level illumination when you least expect it. This low power will not light up standard incandescent bulbs but it will sometimes be enough for LED lights that typically use only about 1/10th the power required by incandescent lights. The two solutions...
    view full answer...
  • Trailer Wiring Harness for 2006 Honda Odyssey
    From the looks of the photo you sent in, you may have the wrong trailer wiring harness for your 2006 Honda Odyssey. I was unable to find your order number, but the wiring harnesses that fit an '06 Odyssey do not have the extra plug/cap like you are showing. That said, from the photo it looks like that is just a cap for the plug, but that would be unusual because there's really no reason to have a cap on the T-connector like that. The wiring harnesses that fit your 2006 Honda Odyssey are...
    view full answer...
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  • Curt Trailer Wiring Harness for 2006 Honda Odyssey has Constant Power
    Are the lights on the trailer actually lighting up or just the circuit tester? If the trailer has LED lights then it is more likely that Curt harness # C56161 will cause them to dimly light up. Curt trailer wiring harnesses that are powered like this one sometimes have this issue. The converter is working properly but for some reason a little power bleeds through causing this exact issue. The Tow Ready harness # 118438 does not have a history of this issue and would be the preferred wiring...
    view full answer...
  • Trailer Wiring for a 2007 Honda Odyssey and Trailer with 11 Running Lights
    The amperage draw of the 11 running lights is a bit of a concern unless they are LED lights. I recommend going with a higher capacity harness, # 119147KIT. It is rated for 2.1 amps per side for brake and turn signals and 7.5 amps total for all running lights. If you can check each light to determine the amperage draw that will tell you if even the 119147 harness is rated high enough.
    view full answer...
  • Troubleshooting Passenger Turn Signal Working Intermittently On 2006 Honda Odyssey
    I'm sorry to hear you are having a problem with the Curt T-Connector Vehicle Wiring Harness # C56161 on your 2006 Honda Odyssey! Since you are only having an issue with the passenger side turn signal and it is working some of the time I recommend doing a few simple tests on the harness with a circuit tester like # PTW2993. First you will want to make sure that all of the connectors behind the panel on passenger side rear of your vehicle are securely installed, and that the ground is securely...
    view full answer...
  • Troubleshooting Curt Trailer Wiring Harness on 2012 Honda Odyssey
    The Curt T-Connector Vehicle Wiring Harness with 4-Pole Flat Trailer Connector # C56161 is not a fit for your 2012 Honda Odyssey. It is only a confirmed fit for 2005 to 2010 models. For your 2012 model, you would need # C56378 which replaced the C56118. If that is the model you have, then I recommend checking the connections behind the driver's side trim panel in the rear cargo area of your Odyssey. Check the pins to ensure there are no bent pins and then make sure the ground connection...
    view full answer...
  • Recommended Towing Components for 2005 Honda Odyssey
    Your 2005 Honda Odyssey is rated for towing up to 3,500 lbs. If you don't already have the trailer hitch, I recommend the Curt Trailer Hitch Receiver - Custom Fit - Class III - 2" # C13068. This will be more than capable of towing your boat and trailer. If you don't already have the wiring, I recommend the Curt # C56161. This harness plugs into your Honda Odyssey's electrical junction box, which is located in your rear cargo area, beneath the trim panel on the passenger's side. Then...
    view full answer...
  • Troubleshooting Trailer Lights not Working After Harness Install
    There are a number of steps for you to take to figure out exactly why the lights on your trailer are not working. You did not specify the harness you used, but for a 2007 Honda Odyssey, there are three fits, the T-One # 118438, Curt # C56161, and Hopkins # HM11143115. To start, we'll isolate the problem to either the trailer or vehicle. You can do this by using a circuit tester such as # 40376 to check the functions of the 4-way plug while somebody else engages them (brake, turn signal,...
    view full answer...
  • Parts Needed To Tow a Trailer with Brakes With a 2009 Honda Odyssey
    The Draw-Tite Max-Frame Trailer Hitch Receiver part # 75270, 7-Way RV Upgrade Kit for Trailer Brake Controller Installation part # ETBC7L, and Curt Echo Wireless Trailer Brake Controller part # C51180 along with a 4-way like the Curt T-Connector Vehicle Wiring Harness part # C56161 are all excellent options needed to tow a trailer with brakes. The only other thing I would add is the Curt No-Drill Bracket for 6-Way or 7-Way Round Trailer Connector Mounting Bracket part # C57202. In regards...
    view full answer...
  • Complete Setup For Towing A 3,500lb Trailer With A 2008 Honda Odyssey
    A few things will be necessary items if you plan to tow close to 3,500lbs with your 2008 Honda Odyssey. You will need a hitch receiver, trailer wiring kit, weight distribution hitch, and possibly a brake controller. It is always a good idea to also install a transmission cooler, power steering cooler, and suspension enhancement for safety and comfort. If you do not have a hitch receiver yet, I recommend the Draw-Tite Max-Frame Trailer Hitch Receiver # 75270. This has the highest weight...
    view full answer...

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