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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

Item # C55504
Our Price: $56.52
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Custom Fit Vehicle Wiring

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CURT custom fit vehicle wiring for your 2003 Dodge are available from Installation instructions and reviews for your Dodge custom fit vehicle wiring. Expert service, and great custom fit vehicle wiring prices. carries a complete line of CURT products. Order your Curt T-Connector Vehicle Wiring Harness with 4-Pole Flat Trailer Connector part number C55504 online at or call 1-800-940-8924 for expert service.
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  • Reviews (53)
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CURT Custom Fit Vehicle Wiring - C55504

  • Custom Fit
  • Trailer Hitch Wiring
  • 4 Flat
  • 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. Converter is made using SMT to ensure superior performance.


  • 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)
  • Connects quickly and easily - no cutting or splicing of wires
    • Locate connection points behind rear bumper
    • Plug in T-connector
  • 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
  • Comes with dust cap for 4-way flat connector


  • Maximum amperage:
    • Stop/turn lights: 3 amps per circuit
    • Tail lights: 6 amps per circuit
  • Limited 1-year warranty


This custom-fit T-connector plugs into your vehicle's wiring harness, which is located behind the rear bumper on both the driver's and passenger's sides.

Once installation is complete, the 4-way connector will be stowed beneath your vehicle, near the trailer hitch. A mounting bracket (sold separately) is recommended to keep the connector secure.

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.

Each Curt circuit board is made using high-quality components that are pieced together in the most technologically savvy fashion, leading to greater predictability and reliability in functioning.

55504 CURT T-Connector - Surface Mount Technology - 4 Wire

Installation Details C55504 Installation instructions

California residents: click here

Customer Satisfaction Score:

Customer Reviews

Curt T-Connector Vehicle Wiring Harness with 4-Pole Flat Trailer Connector - C55504

Average Customer Rating:  4.5 out of 5 stars   (53 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. Converter is made using SMT to ensure superior performance.

2005 Saturn Relay

after having a problem with relay inside my tipm for right trailer lights it's makes a great bypass and still have my trailer lights just remove fuses for factory connection and using shrink tube seal off factory wiring

2003 Dodge Ram Pickup

Installation was quick, and I have yet to test lights on a trailer, so I can't review the functionality yet. I purchased the harness to get around the poorly designed power distribution units on a 2003 Dodge Ram 2500 after my right side trailer lights went out. The only issue I have with the harness, which is very minor, is the electrical box of the harness did not have a sticker on it to label the wire functions. Slightly annoying, but will not hinder function at all.

Still works great!
Zach E - 09/13/2017

2018 Dodge Ram Pickup

Simple to install with basic hand tools. I purchased one for a 2018 Nissan Rogue for towing a very small and lightweight trailer. Works great. I also purchased one for a 2004 Dodge Ram 1500 that has a terrible design flaw with the add on trailer light circuit from factory. This totally bypasses the stock harness, which makes more sense, is simple to install and keeps you away from the dealer for a very costly repair. I am not sure if many Dodge owners are aware of this product. I highly recommend it. As a retired jet engine mechanic, I try to repair or modify for the best logical solution. This harness is one of the times..
I will buy future products from as they sell some great products at good prices..

Absolutely no issues with this harness at all. I am amazed at how many Dodge truck owners I have had this conversation with, where they bought and installed it with the same success.
CHRIS - 01/06/2022

2005 Dodge Ram Pickup

Seems to be a pretty good product. Everything works as it should and installation was quick and easy. Only problem was that my connection points was not where the instructions said they'd be. I'm not sure if that is because my truck came with factory trailer set-up and that this product is intended for a truck with out it or not. I bought this to bypass my factory set up because my relays went bad and according to the dealer they are irreplaceable and I would have to change my while fuse box, I guess it's pretty common for I think 2001-2005 dodge trucks might be other years not sure. This worked for me and if you have the same problem I would highly recommend this, it is only a 4 pin connector so no trailer breaks, just brakes lights and turn signals. I will add photos of where the connections were supposed to be according to the instructions and where they are actually at on my truck. One picture will show the converter box and ground, I put them in the General location of where the instructions said the hook ups would be for the t connector.

2003 Dodge Ram Pickup

Very easy to install with plug and play. No need to run any power wires, just have to attach the provided ground wire to the frame. The converter box has double sided tape to mount to the underbody and included zip ties help secure the wiring. Comes with a flat 4 trailer harness for the truck. I actually spliced in for my 6-7 pin connector.


I just got around to putting this on my truck yesterday. I found it to be very easy, almost to the point that it was self explanatory. No question who I'm buying this sort of thing from next time.
This fixed all the issues with my tail lights on the truck and camper.Thanks etrailer guys.

A year later this harness fixed all the problems which seemed to be steming from human error in wiring. With this harness,I have not looked back.. Thank you..
Daniel M - 05/22/2021


I’ve been using my truck towing trailers with the left tail light and blinker out for the last two years dreading buying a PCM to fix the problem found this one night look at online installed in about an hour only because I wired it up to my factory seven pin and it works great would recommend it to anybody

2003 Dodge Ram Pickup

Product was exactly how it was on the website. It connected to my truck perfectly and in very little time. Works great. One thing I would like to have seen was some dielectric grease to put on the connectors. I had some laying around so that was no issue but it would definitely prolong the useful life of the product, especially in areas where corrosion is prominent.

Dakoda, thanks for the reminder! Dielectric grease is available under our related parts tab found on the product page or individually as part # 11755
Dielectric Grease for Electrical Connectors, 2 oz.
-- Etrailer Expert Laura E - 06/01/2017

2003 Dodge Ram Pickup

i bought parts to hook up lights and brakes for my carhauler trailer .parts came in timely and easy to install working great tech advice very good staff answered questions fast

it is a good product i recommend it
Harry P - 04/18/2017

2003 Dodge Ram Pickup

This t-connector from etrailer fixed my problems with my 2003 Dodge Ram's totally dead trailer light connector. Not hard to do. Youtube has video on removing tail lights and I recommend looking at it. It's kind of weird. Locking connectors were perfect fit. My truck had factory tow pkg with corroded trailer wiring relays under the hood, so there was no set of connectors behind the bumper to connect to. That's why you hook up at the taillights. Thank you e-trailer--I'm legal pulling my boat again.


The wiring kit was a breeze to install and worked great up to a month ago. The four wire flat connector did not hold up. I was not getting a good connection all the time. I have been having problems with the brake light working on a consistent basis. I tested the wiring and all is good on the truck and trailer. I just ordered new connectors from e trailer today.


Attention owners of Gen 2 Dodge Ram 1500. This can end your trailer light woes. If you done your research, you are well aware of the 3 relays on the bottom of the circuit board in the fuse box that effects your trailer light harness. Of course Dodge says the fuse box must be replaced $$$$. Or you could attempt to replace the relays if you can find them with a lot of work. This harness was the solution for me. Quick install, no soldering and dismantling the fuse box, just up and running with trailer lights in about 30 mins. Very happy!!

Dodge Ram Pickup

Your wiring harness C55504 for my Dodge Ram 1500 was the smartest product I have purchased. Dodge trailer wiring had its own circuit which constantly failed and Dodge said is not fixable. You have to replace the entire fuse box. Your "plug and play"harness is easy to install and works great. I finally have all lights working on my trailer. THANKS.


I can not truely give this a 5 star until i hook this up and see how it works. I will give an update once i do. The shipping was fast and it was packaged well. I have order T connector wiring harnesses in the past from etrailer and always had good luck with there products


Very fast shipping. Product installed very nice. Like many dodge owners that have the dead pin for left turn and brake light, This works very nicely. Saves a ton of money over dodge dealership for new Power Control Module. I tested the flat four connector with a test light after hooking it up and all was fine. Did not hook up to trailer and test as of yet, Don't for-see any problems. I would recommend it.

2004 Dodge Ram Pickup

Solid product. The instructions are a bit off for my 2004 2500 ram. The T actually goes in place against the tail lights not at a bumper connection as described in step one. ETrailer delivery time was awesome! The order was processed and packed the same day! Thank you!

2004 Dodge Ram Pickup

It would not work on a trailer longer than 10'. Waste of money for me. Out of the 7 trailers I own, only one works. The others have no lights, blinkers, or stop lights.


I was disappointed that I had to pay for another wiring harness after only two years. I understand it had a one year warranty but did not expect it to fail after only two years leaving me unable to go on camping trip last weekend. The person I talked to was helpful so she gets a star.


I was disappointed that I had to pay for another wiring harness after only two years. I understand it had a one year warranty but did not expect it to fail after only two years leaving me unable to go on camping trip last weekend. The person I talked to was helpful so she gets a star.

2003 Dodge Ram Pickup

This was a very inexpensive alternative to a very expensive problem. In order to repair existing problem, I would have to replace fuse box on my 2003 Dodge Ram. I was quoted prices from 600.00 to 750.00. I spent less than 60.00 and 1 hour to get the same results. Thank you Curt and

2003 Dodge Ram Pickup

The kit took less than 30 min. to install, saved me a small fortune, and a lot of misery. As we say down South, "This is slicker than snot on a door knob."

Hi Bob H. Saved you a small fortune. Did you use this kit to bypass a problem with factory 7 pin connector? My left turnbrake on 7 pin is not working and Dodge dealer wants $1200 to replace power distribution center fuse box under hood. Thanks in advance for any help.
-- comment by: Rian M - 07/12/2014

This unit has been in regular use since I installed it about a year ago. I tow 8 to 10 thousand miles a year, and reliability is extremely important to me. Ive had exactly ZERO PROBLEMS with this system. Its an excellent product.
Bob H - 10/25/2014

2002 Dodge Ram Pickup

The hardest thing about installing the curt T connector was getting the tail light connectors apart. The curt T connector works GREAT I highly recommend it .


Outstanding Service. Went Priority Delivery and I had it within 2 days. Hooked up quickly, and works great. No photo.

I have had zero problems with it. My tail lights work great.
Allan V - 08/05/2016

2003 Dodge Ram Pickup

It did exactly what it's suppose to. It took all of 5 min to install and zip tie up all the wires. If I had a complaint it would be add a few extra zip ties.


The exact fit and plug and play saved me a lot on a costly repair and very helpful customer service answered all my question and help insure I got the proper part I was looking for thank you very much will continue to be a customer

Show More Reviews

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

  • Trailer Wiring Harness Recommendation for a 2003 Dodge Ram 1500
    For a wiring kit that would install in your 2003 Dodge Ram 1500 I recommend the Curt Wiring Harness part # C55504, which you referenced. This harness plugs inline with your truck's taillights to provide you with a fully functional 4-way. Basically you would just need to unplug your taillight harnesses, plug the harness into the connector of the # C55504 and then plug the other end of the harness into the taillight assembly. Check out the installation instructions I attached for this product...
    view full answer...
  • Installation Of Curt T-Connector Vehicle Wiring Harness On 2002 Dodge Ram Pickup
    The installation of the Curt T-Connector Vehicle Wiring Harness, part # C55504 is really easy and I am sure you will have no problem. You will need to locate the wiring harness under the truck on both the driver and passenger side. They will have connectors that look similar to the connectors on the # C55504. Just separate the connectors on your truck being careful not to break the locking tabs and connect the wiring harness connectors as described in the included instructions. You...
    view full answer...
  • Does Curt Trailer Wiring Harness part # C55504 Fit 2002 Dodge Ram 1500
    Yes, the Curt trailer wiring harness part # C55504 that you referenced is a confirmed fit for your 2002 Dodge Ram 1500 and installs by plugging inline with the taillight wiring harnesses.
    view full answer...
  • Trailer Wiring Connector on a 2003 Dodge Ram to Work With LED Light Installed on the Trailer
    If you already have a wiring harness installed from the factory on your Dodge, then you will not need to upgrade your trailer wiring. Your Dodge's wiring will handle the LED lights on your trailer. If you need a trailer connection, then all you will need is the Curt T-Connecter Wiring Harness, # C55504. The harness uses existing wring plugs on your vehicle's harness. No cutting or splicing of wires is necessary. LED lights actually draw less power than traditional incandescent bulbs....
    view full answer...
  • Installing a Trailer Wiring Harness on 2004 Ram for Just Left Turn/Brake Lights for Factory 7-Way
    I have heard other customers who had similar issues and they were able to get the dealer to fix the issue under warranty but only 1 time. I don't know if your 2004 Ram still has any warranty but it might be worth a phone call to a dealer to find out. Or you can install wiring harness # C55504 which plugs in line with the vehicle tail light wiring. the converter is already built in and you will not have to worry about cutting and splicing vehicle wires for installation. If you only need...
    view full answer...
  • Available Plug-and-Play 4-Pole Wiring Harness for 2003 Dodge Ram 2500
    For your 2003 Dodge Ram 2500 you can use Curt plug-and-play 4-pole wiring harness kit # C55504 which offers custom-fit plug-in connectors for simple installation. All you need to do is connect the harness at the truck's tail lights and install the ground wire ring terminal to a bare metal surface. I suggest using dielectric grease # 11755 on all connectors to help prevent corrosion from causing signal transmission problems.
    view full answer...
  • Tail Light Converter Option for 2004 Dodge Ram Pickup
    For the 2004 Dodge Ram without the factory installed trailer connector, yes you will need a convertor. This converter adapts vehicles with separate turn and stop lights (3-Wire System) to standard trailer tail light wiring (2-Wire System). In a three wire system, a separate wire is used to carry each of the stop, turn, and running light functions to the tail light assembly. On most trailers, the stop and turn signal functions are sent through the same wire. I suggest the Curt # C55504...
    view full answer...
  • Adding a 7-Way Trailer Connector to a 2004 Dodge Ram with Factory 4-Way
    You can add a 7-Way trailer connector and retain the use of a 4-Way as well by installing # 37185. The 4-Way you have will plug into the 37185 and the remaining wires would have to be hardwired in. The white wire grounds to the truck frame. Black is for 12 volt power, blue is output to the trailer brakes and purple is for reverse lights. Whatever the trailer does not need you do not have to wire up. So for example if the trailer does not have reverse lights or the need for a 12 volt circuit...
    view full answer...
  • Bumper Mounted Hitch for a 2005 Dodge Ram 1500
    The Draw-Tite Max-Frame Trailer Hitch Receiver item # 75151 fits 2005 Dodge Ram 1500's that do not have a factory hitch. The hitch mounts directly to the bumper. I have linked a picture that shows how this hitch installs along with the instructions. To control your trailer's lights you will need the Curt T-Connector Vehicle Wiring Harness with 4-Pole Flat Trailer Connector item # C55504.
    view full answer...
    Image 1 for
  • Does the Brake Install Kit part # ETBC7 Come with a Brake Controller
    Actually the Brake Install kit part # ETBC7 does not include a brake controller. It includes basically everything else you would need to install one on a vehicle that has a 4-way. If you have a 4-way and a brake controller already all you would need is the # ETBC7 and you would get everything needed. If you still need a 4-way you would want the # C55504. I attached an install video and instructions for the # ETBC7 for you to check out as well.
    view full answer...
  • Trailer Wiring Harness Recommendation for a 2003 Dodge Ram 1500
    For a wiring kit that would install much easier than the Tow Ready Harness part # 119190KIT that you referenced in your 2003 Dodge Ram 1500 I would recommend the Curt Wiring Harness part # C55504. This harness plugs inline with your truck's taillights to provide you with a fully functional 4-way. Basically you would just need to unplug your taillight harnesses, plug the harness into the connector of the # C55504 and then plug the other end of the harness into the taillight assembly. Check...
    view full answer...
  • Trailer Wiring Harness to Bypass Factory Tow Package on a 2004 Dodge Ram 3500
    You can use Curt wiring harness # C55504 which plugs in line with the tail light wiring on your 2004 Dodge Ram 3500. This will bypass the tow package wiring and provide light functions only at its 4-Way connector which you could either keep or cut off to wire the remaining wires to the back of a 7-Way connector if that is what you have. On this Curt harness the white wire is ground, brown is running lights, yellow is left turn/brake lights, and green is right turn/brake lights.
    view full answer...
  • Will Curt Trailer Wiring Harness C55504 Show Resistance on Tail Lights on 2005 Dodge Ram Flat Bed
    Your flat bed must have LED lights. The Curt trailer wiring harness # C55504 is compatible with LED lights and will provide the proper resistance to operate the trailer lights. But honestly I recommend a hardwire, powered wiring harness for this application such as # 119190KIT for added circuit protection and so the 2005 Dodge Ram battery powers the lights.
    view full answer...
  • Trailer Wiring for 2005 Dodge Ram
    Are you saying your factory 7-way is not working due to bad relays on your 2005 Dodge Ram? If so the T-Connector Vehicle Wiring Harness # C55504 should allow you to add a 4-flat but I cannot guarantee it will work if there is an internal issue with the wiring. This harness plugs into connection points behind your Ram's tail lights if there are any connectivity issues with your relays I would not be able to guarantee this would bypass those.
    view full answer...
  • No Drill Trailer Hitch Fit for a 2005 Dodge Ram 1500
    The Draw Tite hitch part # 75420 that you referenced has been confirmed as a fit for your 2005 Dodge Ram 1500 without a factory hitch and will not require any drilling for installation. I attached an install video for this hitch for you to check out as well. If you wanted to do some towing you might be interested in etrailer ball mount kit # 989900. It comes with 2 ball mounts; one with a 3/4 inch rise or 2 inch drop and one with a 2-3/4 inch rise or 4 inch drop. It also includes a 1-7/8...
    view full answer...
  • How To Bypass Factory Trailer Lighting Circuits On a 2005 Dodge Ram 3500
    In order to bypass the factory trailer lighting circuits on a 2005 Dodge Ram 3500 you'll first need to start with the Curt T-Connector Vehicle Wiring Harness part # C55504. This can then be adapted to a 7-way using the 4 to 7-Way with 4-Way Adapter part # ETBC7. This will provide you with everything needed to bypass the factory trailer lighting circuits.
    view full answer...
  • Can the Factory Trailer Wiring Harness Be Bypassed On a 2003 Dodge Ram 2500
    Yes, the factory trailer lighting circuits can be bypassed on a 2003 Dodge Ram 2500 and it is actually rather commonly done due to the error ridden TIPM and its cost to fix or replace. In order to do this you'll need the Curt T-Connector Vehicle Wiring Harness with 4-Pole Flat Trailer Connector part # C55504. If you need a 7-way then you'll also need the Universal Install Kit part # ETBC7.
    view full answer...
  • Trailer Hitch For A 2002 Dodge Ram 1500 Pickup
    There is currently not an installation video on the installation of The Curt Trailer Hitch Receiver # C13320 it does come with detailed instructions and is not a hard install. The hitch is confirmed to fit your 2002 Dodge Ram 1500. It has a bolt-on installation with no welding required. It has a gloss black powder coated finish which is over a protective base coat that offers superior rust resistance. The trailer hitch has a maximum gross trailer weight up to 6,000 pounds and has a...
    view full answer...
  • Parts Needed to Bypass the Factory Trailer Wiring of a 2005 Dodge Ram
    The trailer wiring circuits on the mid 2000's Dodge trucks had some interesting issues. The easiest way to deal with them is to bypass the factory trailer wiring. To do this with a 7-way like you said you have on your truck you will first need to start with a 4-way. For that you will need the part # C55504. Now if all you need is taillight functions and your trailer does not have brakes all you would need to convert this to a 7-way is the part # 37185. If you do have trailer brakes and...
    view full answer...
  • Trailer Hitch Recommendation for a 2002 Dodge Ram 1500
    The build dates do not apply to the 2002 Dodge Ram 1500, only to the 2003 models. For your 2002 Dodge Ram 1500 I have linked all of the trailer hitches that fit. The Curt trailer hitch that you referenced, # 13326, will fit your Ram. If you plan on doing some towing then I also recommend etrailer ball mount kit # EBMK4. It comes with a ball mount, interchangeable ball set, hitch pin with clip, and a storage bag. For trailer wiring use # C55504 if needed.
    view full answer...
  • Trailer Hitch for a 2004 Dodge Ram 3500 Diesel Dually
    Yes, the Curt trailer hitch # 14361 is listed as a fit for all 2004 Dodge Ram 3500 series trucks. But it does not fit HemiSport Quad Cab, Ram Rumble Bee or SRT-10 models. I have included a link to the installation instructions for you. I also recommend etrailer ball mount # EBMK2416. It comes with a ball mount, 2 hitch balls, a hitch pin with clip, and a storage bag. If you need to add trailer wiring use # C55504.
    view full answer...
  • Troubleshooting Lighting Functions on Trailer Wiring Harness on 2004 Dodge Ram 1500
    The lighting malfunctions you describe could be caused by one of several factors, but the most common faults that would account for them are either a bad ground or an overloaded wiring harness on the vehicle. Since you have tried your 2004 Ram Pickup with another trailer and have the same problem, I suggest you first focus on the vehicle for troubleshooting. The best tool for this is a circuit tester, such as # PTW2993. First, you will want to test the Ram trailer connector for proper...
    view full answer...
    Image 1 for
  • Is Taillight System of 2005 Dodge Ram 3500 a 2 Wire or a 3 Wire
    Your 2005 Dodge Ram has a 3 wire system. To install the 119190, the green converter wire would tap into the right turn signal circuit, the yellow into the left turn circuit, the brown into the running light circuit , the white would ground and the red wire would connect to a brake lamp circuit. If you're wanting a hardwire kit, I'd go with the # 119190KIT, which includes the kit for running the power wire to the vehicle battery and the circuit tester which aren't included with the # 119190. Going...
    view full answer...
  • Troubleshooting Running Light Circuit Not Functioning on a 2003 Dodge Ram Trailer Wiring
    First thing you should do at this point is test the 4-way of the wiring harness with a circuit tester part # PTW2993 for voltage on all of the right pins when the taillight signals are being applied. Just like in the video I attached. If the voltage checks out there but the trailer lights still don't function right then the problem is on the trailer wiring. That would mean that problem is either due to a ground issue or a short issue. Make sure that the trailer side connector are clean...
    view full answer...

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