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  1. Flat Tow Wiring Harness
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Curt Universal Tail Light Wiring Kit for Towed Vehicles

Curt Universal Tail Light Wiring Kit for Towed Vehicles

Item # C63CR
Our Price: $69.83
Flat Tow Wiring Harness

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Connect your towed car's lighting system to your RV to activate the signal lights required for towing. This universal harness wires in to your vehicle's existing wiring with the included connectors. 1-800-940-8924 to order CURT flat tow wiring harness part number C63CR or order online at Free expert support on all CURT products. Great prices and Fastest Shipping for Curt Universal Tail Light Wiring Kit for Towed Vehicles. Flat Tow Wiring Harness reviews from real customers.
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  • Reviews (84)
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CURT Flat Tow Wiring Harness - C63CR

  • Wiring Harness
  • Splices into Vehicle Wiring
  • Tail Light Mount
  • CURT
  • Universal

Connect your towed car's lighting system to your RV to activate the signal lights required for towing. This universal harness wires in to your vehicle's existing wiring with the included connectors.


  • Lets you connect your RV's tail, brake and turn signal lights to your towed vehicle's lighting system
    • Provides 4-way flat plug at front of towed car to connect to motor home
  • Wires in quickly and easily
    • Splices into vehicle's electrical system with included butt connectors
    • Color-coded wires with wiring guide for easier installation
  • Integrated block diodes isolate sensitive vehicle electronics from RV signals
  • Includes harness, 4-flat extension, mounting bracket, and hardware
  • 1-Year limited warranty

Wiring Your Vehicle

Typically, wiring your car for flat towing is a tremendous chore. You have to position and mount multiple diodes beneath your car and then splice into the car's wiring. Each wire - for running lights, brake lights, and both turn signal lights - must be connected to a diode. And don't forget to jump the diodes so that the running light signal is sent to both sides of your car.

Or you could just use this Curt wiring harness. This universal-designed system connects to your vehicle's existing wiring. Simply splice into your factory wiring and connect the labeled wires to your factory wiring with the included butt connectors.

Do You Need a Brake Light Relay?

Because your vehicle has a combined lighting system - wherein the brake signals and the turn signals are carried on a single wire - a brake light relay (RM-88400 - sold separately) may be required if you use a supplemental braking system with your towing setup. A supplemental braking system depresses the brake pedal in your towed car every time you apply the brakes in your RV. So, if your towed car's brake lights illuminate when the brake pedal is pressed and the engine is off - as is the case when towing - then you need to install a relay to ensure that the lights on your towed car always act in accordance with the signals sent by your RV via the wiring harness. Without a relay, the brake signal from your towed car will override the turn signal sent by your RV when you slow down to make turns, creating a potential hazard.

58979 Curt RV Tow Harness for Towed Vehicles

Installation Details C63CR Installation instructions

This Product Fits The Following Vehicles

Customer Satisfaction Score:

Customer Reviews

Curt Universal Tail Light Wiring Kit for Towed Vehicles - C63CR

Average Customer Rating:  4.5 out of 5 stars   (84 Customer Reviews)

Connect your towed car's lighting system to your RV to activate the signal lights required for towing. This universal harness wires in to your vehicle's existing wiring with the included connectors.

2024 Chevrolet Silverado 2500

The labels for the Right Taillight Running Light splice were labeled Backwards, to module and to vehicle were reversed which wasted 30 minutes of time. Beware! etrailer may want to get this right with the vendor or risk a bunch of needless returns.

Etrailer Expert

Jenny N.


I am sorry that the harness was labeled incorrectly. I had our Quality team check our stock and made sure that the rest were correct. I know that the right turn wiring on the harness with be the green wire [passenger side] and the left turn wiring on the harness will be will be yellow [drivers side]. The brown wiring on the harness will be the tail lights.


I have bought off of you before everything was great this is the first time that I received something that was not what it was supposed to be or was used before the papers on the installation were all wrinkled and dirty and had writing on the ends of the wire were all cut and the connectors were not on I called your company and they made it right and gave me back my money except for my shipping and they told me just to keep it it's no good to me but thank you and I am still buying off of you


Pretty well just a box pf hardware. I bought some more diodes and figured out eventually


Worked perfectly for wiring our car for towing. No problems. Would recommend for anyone!


You customer service is fantastic !!


Easy to install. great how to video on the etrailer site. The video needa 1 slight improvement to make it more clear which socket (upper or lower) on the tailight housing to plug into.


Great service and good customer support.


The order took very long to arrive. There was no help tracking where our order was and when it finally did arrive the day before my installation appointment, it was the wrong product and they couldn't use it.
Now I have to figure out how to return the product

Etrailer Expert

Brooke M.


I am sorry to hear that. I will have our customer service team reach out to you about return options.


Product worked as advertised. Great service. Thank you.


Easy to install works as expected.


Worst nightmare ever! Our mechanic has a person who wires cars for trailers. He could not make it work ($XXX). We were rushed to get it working, before our big summer trip and a Car Electronics Specialist got it working for us ($XXX). I guess I should have gone with a Blue Ox wiring kit. But nothing but this one was recommended to me.

Etrailer Expert

Jenny N.


We do have several options for towing wiring for a 2007 Toyota Yaris. You can see them in the link below.

2022 Jeep Grand Cherokee WK - old body

Great diy product with easy to follow instructions that require only basis tools.


Everything needed to wire the tail lights to the rv


The kit was very easy to install thanks to the wire labels and Easy Fast Installation video available online. Now I no longer need the magnetic mickey mouse ear tow lights. Thanks etrailer.

Kenneth H.


It has worked so well that I have been telling other RVers that tow a vehicle to install the kit. Love youll at Etrailer.

2016 Toyota Corolla

Two mislabeled circuits. One on the left and one on the right. Difficult installation. Took two days to complete and my son who works on aircraft avionics was the person to do most of the install. It works when finally all installed correctly. Lots of metering to get this done. We did a more difficult routing through the car and firewall to hide and protect all the wiring. Also ran an additional wire if we ever add trailer hitch and need power for that install.


Did not work for my car. Returned with no problem

by: 11/23/2023

Perfect fit easy to install

2022 Jeep Cherokee

Great product, i just ordered the wrong one.


etrailer was a great resource for me to establish my towable. Always available, replaced a damaged part with no issues. One of the best online large projects I've had. Went into this expecting the usual battle, but they were great.


service was great and very profesional


Package improperly packed. Smaller box crushed by heavier base plate box. Paper dunnage only on top, not separating cartons inside.
Fortunately no apparent damage to product. Will test when installed.
This is a teachable moment for packing department.


Well built, easy to connect & disconnect by myself.
I am glad I spent a little more for a high quality product!


Took less than 3 hours to install thanks to excellent instructions. No problems and has worked flawlessly for a year.

2016 Jeep Grand Cherokee

Always the best service.


Awesome and Easy Service!

Show More Reviews

See what our Experts say about this CURT Flat Tow Wiring Harness

  • Tow Bar Wiring For 2020 Ford Ranger & Is Brake-Lite Relay Needed
    We can get your 2020 Ford Ranger set up with a tow bar wiring system, and instead of a wiring kit with separate diodes, I recommend going with an option from Curt: - Curt Universal Tail Light Wiring Kit for Towed Vehicles # C63CR The Curt wiring kit splices into your Ranger's lights with butt connectors already attached to the wires; it also uses integrated diodes to make it easier to install, and will splice directly into both the left and right turn signal lights and the brake lights....
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  • Tow Bar Lighting Solution for 2022 Ford F-150 with LED Taillights
    We have tow bar lighting solutions for your 2022 Ford F-150 that has LED taillights but we don't have anything that is plug and play as that's pretty rare to be available for vehicles still. We did have the chance to install the Curt wiring kit part # C63CR on a similar 2020 Ford F-150 as yours though which I attached an install video link to on this page that would walk you through the entire process. This will take out a lot of the guesswork but it does still require splicing into the...
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  • Tow Bar Wiring Recommendation for 2020 Jeep Gladiator
    For your 2020 Jeep Gladiator we have diode style tow bar wiring kits like the part # RM-15247 which would would great but we do not have any custom fit kit like you may be looking for. I did attach and install video for the # RM-15247 on a similar 2021 Gladiator for you to check out as well. This kit once installed will activate your Gladiator taillights while it's being flat towed and comes with a coiled wire to go between the tow vehicle and the towed vehicle.
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  • Will The Curt Universal Tail Light Wiring Kit Also Activate The Brakes On The Towed Vehicle
    No, the Curt Universal Tail Light Wiring Kit for Towed Vehicles # C63CR is just to transfer your turn and braking signals from the motorhome through your towed vehicle so that drivers behind you can see them. To activate the brakes in your towed vehicle you would need a supplemental braking system like the Brake Buddy Select 3 Portable Supplemental Braking System # HM39524. This braking system offers intense, emergency braking or steady, smooth braking in a single portable system. Easily...
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  • Is Curt Tail Light Wiring for Flat Towing Compatible With LED Lights
    I can confirm that a vehicle with LED lights can absolutely use the Curt Universal Tail Light Wiring Kit for Towed Vehicles # C63CR.
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  • Flat Tow Wiring Harness for a 2023 Jeep Wrangler 4xe
    It looks like you changed your order to the Curt Universal Tail Light Wiring Kit for Towed Vehicles # C63CR for your 2023 Jeep Wrangler 4xe. You made the right call switching because this is what you would need for flat towing your Jeep Wrangler 4xe. For a complete flat towing setup you will need a base plate kit, tow bar, safety cables, vehicle tow bar wiring, a supplemental braking system, and possibly a high-low adapter. If you do not have all of these components just let me know and...
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  • Troubleshooting Running Light Circuit for Curt Flat Tow Wiring on 2019 Ford Ranger
    That definitely doesn't sound good. The brown wires on both sides of the Curt Universal Tail Light Wiring Kit # C63CR should be sending signals since it's for different tail light sides on your 2019 Ford Ranger. It could be a bad diode but it could also be damaged wiring. I recommend adding 12V power to the 4-Way pin with the green wire and then checking the green wire at the butt connectors to see if the signal gets to the end of the wiring. This tells you if the issue is that diode/module...
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  • Does Jeep Wrangler Battery Need Charging When Using Curt Tow Bar Wiring
    Since it will be connected to your motorhome, you do not need any type of battery charger in your 2019 Jeep Wrangler Unlimited when using the wiring kit from Curt: - Curt Wiring Kit # C63CR
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  • Are Diodes of Curt Universal Tail Light Kit part # C63CR Designed to be Replaced
    The diodes of the Curt Universal Tail Light Wiring Kit for Towed Vehicles # C63CR that you referenced were not designed to be replaced. They are very reliable though so it's not something you'd really need to worry about. They are under the black wire loom.
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  • 2002 Suzuki XL-7 Flat Tow Wiring Recommendation
    I do! To add wiring so your 2002 Suzuki XL-7 tail lights work in tandem with your motorhome lights I recommend the Curt Universal Tail Light Wiring Kit # C63CR which is a simple, yet effective wiring kit. Just splice in the wiring to the tail lights on your XL-7 and then you run the 4-Way connector up to the front of your vehicle and connect it to your motorhome connector! For a complete flat towing setup you will need a base plate kit, tow bar, safety cables, vehicle tow bar wiring,...
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  • Can Curt Tow Bar Wiring Kit C63CR Install on Truck with Separate Turn Signals Brake Lights
    The Curt tow bar wiring kit part # C63CR that you referenced can install on a vehicle that has separate taillights like you have but there is a different wiring required when installed on a vehicle like then instead of a combined setup. You would run the green wire to the right turn signal, the red wire to the brake light circuit, the yellow wire to the left turn circuit, and the brown wire to the taillight circuit.
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  • How Does Curt Universal Tail Light Wiring Kit For Towed Vehicles Get Installed On 2017 Ford Fusion?
    To find the correct wires on the taillight connector of your 2017 Ford Fusion to connect to the Curt Universal Tail Light Wiring Kit for Towed Vehicles # C63CR you will need to use a circuit tester like # PTW2993 to test each wire going to the tail lights. Your Fusion has combined wiring meaning the turn signal and brake lights are shared so you will need to find the factory wire that comes on when pressing the brake pedal and connect the red wire of the Curt harness in to that wire. Next...
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  • Can Air Force Braking System Be Used To Flat Tow Jeep Gladiator With 2021 Tiffin Allegro RV?
    You are correct. Since your 2021 Tiffin Allegro motorhome already comes with the air tank and fitting at the rear, you can simply use Demco SBS Second Vehicle Kit # SM99209 and Replacement Air Jumper # SM99666 to complete the supplemental braking system for your towed 2020 Jeep Gladiator. You will also need base plates, a tow bar, light wiring kit, and safety chains. If you don't have these items already then I recommend the following parts for your 2020 Jeep Gladiator Rubicon Launch Edition. -Roadmaster...
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  • 2017 Kia Soul Flat Towing Requirements And Specifications
    So, in regards to your 2017 Kia Soul, along with # HM47085 and # C63CR you already have, you should not need any more diodes for your vehicle. Since you mentioned your lights stay on after the ignition is turned off, yes, you are going to need a brake light relay kit like the Roadmaster Brake-Lite Relay Kit for Towed Vehicles # RM-88400. I have not heard of the LEDs being an issue on the Kia Soul, as far as I know. If your lights are not functioning as they are intended you likely have...
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  • Curt Base Plate for 2014 Jeep Grand Cherokee Blue Ox Bars
    Yes, the Curt Base Plate Kit # C58FR will work with the Blue Ox Tow Bars. You do not need any special adapters. I recommend the Blue Ox Ascent Tow Bar # BX4370 for your 2014 Jeep Grand Cherokee. For the Tail Light Wiring Kit # C63CR will allow you to use the taillights on Jeep rather than using separate towing lights. The Brake Buddy Select 3 # HM39524 is a convenient and small portable braking system that will work well for your Jeep. It folds down when not in use so that it takes up...
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  • Will Curt Universal Tail Light Wiring Kit C63CR Work On 2017 Ford Fusion Being Flat Towed?
    The Curt Universal Tail Light Wiring Kit # C63CR you were looking at is confirmed to fit your 2017 Ford Fusion Hybrid and would be a great option to power your lights while flat towing it. We have not had a chance to install this specific harness on a Fusion yet but I included the installation video on a 2017 Ford Focus for you to take a look at. You will still need a tow bar, base plate kit, safety cables, and a supplemental braking system. If you do not have these let me know and I...
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  • Trailer Wire Harness for 2013 can am Spyder ST
    While we do not have a custom wire harness, we do have the Curt Universal Tail Light Wiring Kit for Towed Vehicles, # C63CR. This will work but is not a pug and play solution as it requires cutting and splicing of wires.
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  • What Do I Need To Flat Tow A 2001 Jeep Cherokee
    You will need the Demco Classic Base Plate Kit - Fixed Arms # DM9518010 to provide the Demco Commander II Non-Binding Tow Bar - Victory Series - RV Mount - 2" Hitch - 6,000 lbs # DM9511012 an attachment point to your 2001 Jeep Cherokee Sport. Then you will need Curt Universal Tail Light Wiring Kit for Towed Vehicles # C63CR to sync your Jeeps lights to your 2004 Fleetwood Wouthwind 37C lights. So you will have running, brake and blinker lights. Next you need the Demco Stay-IN-Play DUO...
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  • What Wire Harness Will Connect My RAV4 To My Motorhome While Dolly Towing.
    Yes, you can use the Curt Universal Tail Light Wiring Kit for Towed Vehicles # C63CR to sync your motorhome lights to your 2012 Toyota RAV4. This part will make the RAV4's lights work as a combined system while it is being towed. It is legal for the RAV4 to be combined while being towed, even if it isn't when driving. This kit will only work if your motorhome already has a 7 way and 4 way flat since the dolly will take up the 7 way connector on the motorhome. If you only have a 7 way...
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  • Installation Troubleshooting of Curt Universal Tail Light Wiring Kit on 2013 Lincoln MKS
    You won't need any type of converter when installing the Curt Universal Tail Light Wiring Kit # C63CR on your 2013 Lincoln MKS. However there is a distinct process that you'll want to follow to determine how this system will be installed that tells you whether you've got a 2 or 3 wire system and how to install the unit. It sounds like you might have installed this in a 3 wire configuration but there is no power on the turn signals. I would start by checking any and all ground wires that...
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    To flat tow your 2020 Jeep Wrangler you'll need a tow bar, base plate, tow bar wiring kit, braking system, and safety cables. The etrailer SD Non-Binding Tow Bar # e34ZR is a great choice for your tow bar. It has non-binding latches that make unhooking on any terrain easy and telescoping arms that make hooking up on any terrain easy. This tow bar also comes with safety cables so you won't need to purchase any separately. The etrailer Invisible Base Plate Kit # e98948 is a fit for a...
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  • What Trailer Hitch Can I Used W/ My 40' IC Bus
    The only hitches we have that're going to work with your motorhome like the Adjustable Width Trailer Hitch Receiver for RVs, 22" to 72" Wide # 13703 are going to be able to handle up to 3,500-lbs which is not going to be enough for your ProMaster. If you can let me know what the year make and model of your ProMaster is and I can piece together a flat towing kit for you if you'd like. Just to give you an idea, the kit would consist of: - A base plate kit # 3154-3, - A set of tow bars...
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  • Does It Matter Which Wire To Tap Into When There Are Two Wires In Each Jack?
    One wire is likely the ground and the other is the power side that you will want to splice into. Using a volt meter like the Performance Tools # PT89ZR you can determine which is the power wire. If you have two powered wires, then yes, it is probably going to the other side and it would not matter which one that you choose.
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  • Tow Bar Wiring For 2004 Dodge Ram 1500
    There are no custom tow bar wiring harnesses for your 2004 Dodge Ram 1500, and while I can't answer definitively why Hopkins does not make certain products, it's probably because Jeeps are the most-towed vehicle compared to Ram trucks. If you want to use your Ram's lights you'll have to splice with the Tail Light Wiring Kit for Towed Vehicles # C63CR. Otherwise, to avoid splicing altogether the only option is to use a wireless magnetic light kit, either the Hopkins Magnetic Tow Lights...
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Info for this part was:

Employee Lindsey S
Edited by:
Lindsey S
Employee Jeff D
Installed by:
Jeff D
Employee Jameson C
Expert Research:
Jameson C
Employee Jacob T
Video Edited:
Jacob T
Employee Dustin K
Video Edited:
Dustin K
Employee Wilson B
Updated by:
Wilson B
Employee David F
Test Fit:
David F
Employee Bradley B
Test Fit:
Bradley B
Employee Kristina F
Written by:
Kristina F

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