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  1. Flat Tow Wiring Harness
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  3. Wiring Harness
  4. Splices into Vehicle Wiring
  5. 4 Flat
  6. Universal Fit
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1988 BMW 7 Series
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CURT

Curt Universal Tail Light Wiring Kit for Towed Vehicles - 4-Way Flat Connectors

Part Number: C63CR
138 Reviews | 42 Questions
In Stock
$98.72
 Flat Tow Wiring Harness
Not Confirmed to Fit

1988 BMW 7 Series

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curt flat tow wiring harness splices into vehicle universal tail light kit for towed vehicles - 4-way connectors
curt flat tow wiring harness splices into vehicle
curt flat tow wiring harness 4
curt flat tow wiring harness splices into vehicle universal tail light kit for towed vehicles - 4-way connectors
curt flat tow wiring harness 4 c63cr
curt flat tow wiring harness splices into vehicle
curt flat tow wiring harness splices into vehicle universal tail light kit for towed vehicles - 4-way connectors
curt flat tow wiring harness splices into vehicle universal tail light kit for towed vehicles - 4-way connectors
curt flat tow wiring harness c63cr
curt flat tow wiring harness splices into vehicle

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2017 ford focus flat tow wiring harness curt 4 c63cr
2017 ford focus flat tow wiring harness curt splices into vehicle 4 universal tail light kit for towed vehicles - 4-way connectors
0 flat tow wiring harness curt 4 c63cr
2017 ford focus flat tow wiring harness curt splices into vehicle on a
2017 ford focus flat tow wiring harness curt c63cr
2017 ford focus flat tow wiring harness curt 4 on a vehicle
2017 ford focus flat tow wiring harness curt 4 c63cr

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Get a head-start on wiring your towed car before you even get the installation started. This kit comes with butt connectors pre-installed and ready to splice into your wiring. Integrated block diodes protect your vehicle from electrical feedback. 1-800-940-8924 to order CURT flat tow wiring harness part number C63CR or order online at etrailer.com. Free expert support on all CURT products. Great prices and Fastest Shipping for Curt Universal Tail Light Wiring Kit for Towed Vehicles - 4-Way Flat Connectors. Flat Tow Wiring Harness reviews from real customers.
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CURT Flat Tow Wiring Harness - C63CR

  • Wiring Harness
  • Splices into Vehicle Wiring
  • 4 Flat
  • CURT
  • Universal Fit

Get a head-start on wiring your towed car before you even get the installation started. This kit comes with butt connectors pre-installed and ready to splice into your wiring. Integrated block diodes protect your vehicle from electrical feedback.


Features:

  • Connects your RV's tail, brake, and turn signal lights to your towed car's tail lights
    • Plugs into your motorhome with 4-way flat connector
  • Splices quickly into car's electrical system with included butt connectors
    • Color-coded wires with wiring guide makes installation easier
  • Prevents feedback that can damage your vehicle's electrical components with integrated block diodes
  • Includes 4-wire harness, 4-flat extension cable, mounting bracket, silicone sealant, zip-ties, and installation hardware
  • 1-Year limited warranty


Do I Need a Brake Light Relay?

If the engine is off and your car's brake lights illuminate when you press the brake pedal, you need to install a brake light relay (RM-88400 - sold separately) with this kit. Without a relay, your car's brake signal will override the turn signal sent by the RV when you are slowing down to make a turn, creating a potentially dangerous situation. Other drivers will see that you're slowing down, but not that you're making a turn. With a brake light relay, you can signal both and travel safely.



58979 Curt Universal RV Tow Harness for Toads

Installation Details C63CR Installation instructions

This Product Fits The Following Vehicles






Customers Who Purchased This Flat Tow Wiring Harness Also Bought...



Customer Satisfaction Score:

Ratings & Reviews

4.4

138 reviews
5 Stars
(102)
4 Stars
(10)
3 Stars
(10)
2 Stars
(8)
1 Star
(8)
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by:
2025 Chevrolet Silverado 1500
NOT GOOD, I PUT 58984 IN YOUR SEACH BOX AND YOU SENT ME 58979. IT APPEARED YOU WERE SHOWING A RV TOW HARNESS IN GENERAL. THIS HARNESS IS SPLICE IN THE CURT 58984 IS PLUG IN WHICH TAKES FAR LESS TIME.
Mike L. profile picture
Etrailer Expert

Mike L.

8/30/2026

I'll get that straightened out for you Tim!

by:
Price was great but nothing beats the customer service Ive received so far.
by:
2004 Ford Ranger
I had some difficulty at my end when connecting to my 2004 Ford Ranger. My ability to use a multi-meter is not great, so I switched to a simple test light. Also, the wiring on my truck did not match Ford standard colors so I was a bit puzzled. Joshua at eTrailer was a great support, and once I figured out which wire was which on my truck, the installation of the new Universal Kit was easy. I was done within a few hours, including running the new wires all the way to the front bumper.
by:
Worked ok for me not too hard to do
by:
2016 kia Soul
The installation went well, and it works as expected. The instructions rate it as a difficult install. At my age any work crawling around is difficult but the product went in without much fuss. Installed on my 2016 Kia Soul. Thanks for a good economical choice.
by:
Didn’t work…father several conversations, I purchase new diodes and got it working
by:
Pretty well just a box pf hardware. I bought some more diodes and figured out eventually
Roland profile picture

Roland

5/17/2025

Worked great. You need to have some wiring knowledge to install this product.

Jon G. profile picture
Etrailer Expert

Jon G.

5/20/2025

@Roland Splice-in wiring can be a bit difficult if you haven't messed with wiring much for sure. Glad you were able to get it all installed though! What vehicle did you end up installing this on?
by:
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.
Jenny N. profile picture
Etrailer Expert

Jenny N.

9/21/2022

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

Helpful Links

tbwiring-2007_Toyota_Yaris.htm

by:
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. profile picture

Kenneth H.

7/11/2022

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

by:
I didn't think the crimp connections were very good. I tried a number of crimp tools none that I have provided an adequate crimp. The wires would pull out too easy after crimping. Suggest the supplier might recommend the preferred crimp tool. I ended up removing the supplied connectors and using solder sleeves which worked well.
by:
2023 Jeep Cherokee
This required splicing into the tail light harness. I called and was told a plug and play was not available. I returned it after calling Curt who provided me the part number of a plug and play that I ordered on [online vendor].
by:
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.
Clark profile picture

Clark

10/1/2023

Works great.

by:
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
by:
2024 Ford Expedition
Item completely defective. The diodes do not work and the one I received would backfeed power to the car.
Kate F. profile picture
Etrailer Expert

Kate F.

8/31/2026

I am sorry to hear this Matthew. What is the year, make, and model you put this on? Are you able to respond directly to the email you receive with pictures of the install, and also how you tested the diode? I would like to reach out to Curt.

by:
2023 Ford Expedition
If it had been plugged in play, it would’ve been a fantastic product. But because you have to cut splice and do the wiring, I give it a three.
by:
unit did just what is was made for,,, works great
by:
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.
by:
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.
by:
2013 Honda CR-V
Excellent service and great products! Arrived on time
by:
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.
by:
High Quality Great Product
Brooke M. profile picture
Etrailer Expert

Brooke M.

4/28/2025

Sweet! Thanks George :) High-quality product for a high-quality kind of guy

by:
Worked perfectly for wiring our car for towing. No problems. Would recommend for anyone!
by:
Took less than 3 hours to install thanks to excellent instructions. No problems and has worked flawlessly for a year.
by:
Well built, easy to connect & disconnect by myself.
I am glad I spent a little more for a high quality product!
by:
2024 Jeep Wrangler
worked great, good instructions
25
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See what our Experts say about this CURT Flat Tow Wiring Harness

Do you have a question about this Flat Tow Wiring Harnes?
  • 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.
    view full answer...
  • Complete Flat Towing Setup for a 2021 Ford F-150 LTX
    Dave, to use your Blue Ox Aventa LX tow bar with your 2021 Ford F-150 you can use the Roadmaster Crossbar Style Base Plate Kit # RM58VR with the Roadmaster Crossbar-Style Base Plate Adapter for Blue Ox and Demco Tow Bars # RM-033. If you're looking to complete your flat towing setup you're going to need: - A braking system, like the Blue Ox Patriot Portable Flat Tow Brake System # BLU37TR with the Roadmaster Brake-Lite Relay Kit for Towed Vehicles # RM-88400, & - A wiring harness, like...
    view full answer...
  • Recommended Flat Tow Wiring Harness for a 2023 Jeep Grand Cherokee 4XE
    Hey Carl, since you didn't outright mention it I'm assuming you don't have the ParkSense feature so you'll just need the Roadmaster 4-Diode Universal Wiring Kit for Towed Vehicles # RM-15267 with the Chare Line Kit # RM-156-25. If you do have the ParkSense feature, then you'd want the Roadmaster Smart Diode Kit for Variable Voltage LED Tail Lights # RM63MR instead. If you need any other components for the flat tow, please let me know in the comments and I'd be happy to help!
    view full answer...
  • Flat Tow Components for 2023 Ford F150
    Thanks for letting us help Jim. You're definitely most of the way there with your parts list. I do have a few recommendations and things I'd like you to verify before placing your order. For the tow vehicle lighting, I would make one change. The Curt Universal Tail Light Wiring Kit # C63CR is not compatible with vehicles that use PWM (pulse-width modulation) wiring, which I believe is used on your 2023 Ford F-150. I'm not certain which individual lighting circuits on your truck use PWM,...
    view full answer...
  • Do I Need a Brake-Lite Relay Kit When Flat Towing a 2025 Ford Ranger?
    Hey Richard. Yes, the Roadmaster Brake-Lite Relay Kit for Towed Vehicles item # RM-88400 is exactly what you need to get the lights on your 2025 Ford Ranger synched up with the functions on your RV. I've linked an installation video below along with a schematic so you can see how to get the Roadmaster item # RM-88400 installed.
    view full answer...
  • Flat Towing Equipment Needed For A 2020 Jeep Wrangler With Standard Factory Bumper
    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...
    view full answer...
  • Will Curt Universal Tail Light Wiring Kit Fit 2025 Ram 1500 Laramie With 3.0 Hurricane Engine
    Hi Jennings, welcome back! The Curt Universal Tail Light Wiring Kit # C63CR is not compatible with vehicles that have PWM electrical systems. Since you have this on your 2025 Ram 1500 the wiring kit won't work with your truck. Regardless, a better choice would be the Roadmaster 4-Diode Universal Wiring Kit for Towed Vehicles # RM-15267. The Roadmaster wiring is the most reliable, and it also comes with a 6-way so you can add a charge line kit # RM-156-25 to avoid a dead battery. It looks...
    view full answer...
  • 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
    view full answer...
  • Is there a Class III Hitch for a 2005 Toyota Camry?
    Hey Walter! There's no class III hitches for your 2005 Toyota Camry. The only hitch available is the Draw-Tite item # 36336, which is a class II hitch with a 1-1/4" receiver.
    view full answer...
  • 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...
    view full answer...
  • Availability of Plug and Play Tow Bar Wiring for 2017 Chevy Cruze
    Hey John! There may be a plug and play wiring harness for your 2017 Chevy Cruze out there but it isn't something we carry. I do recommend using the Roadmaster 4-Diode Universal Wiring Kit for Towed Vehicles # RM-15267 since it is proven and reliable. Splicing can seem difficult but it really isn't as hard as many people think. I went ahead and attached an installation video below from a different Chevy so you can see what the process is like.
    view full answer...
  • Recommended 4-Pole Wiring Harness for a 2005 Honda Odyssey
    Hey Chris, we actually do have a plug and play harness for your 2005 Honda Odyssey. Check out the T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector # 118438. This wiring harness will just easily plug into your wiring harness which is located behind the passenger's-side interior trim panel in your rear cargo area.
    view full answer...
  • 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...
    view full answer...
  • Troubleshooting Curt Universal Tail Light Wiring Kit Installation
    Hi Joshua, your Tundra uses a 3-wire system (separate brake and turn signals), while the 4-flat coming from your motorhome is a 2-wire system (combined brake/turn). The Curt # C63CR is designed to handle that, but only if it’s tied into the correct wires on the truck. On your Tundra, make sure you’re connected to the actual turn signal wires (left/right) and not the brake light circuit. With separate amber turn signals, it’s very easy to accidentally tap into the wrong wire. If your connections...
    view full answer...
  • Parts Needed to Flat Tow a 2019 Lincoln Navigator 4x4
    From what I could find in the owners manual I located online you can only flat tow your 2019 Lincoln Navigator 4x4 if you have "Slow Climb Mode". If you have the slow climb mode then you will need at least 5 main parts to flat tow. Those parts are a base plate kit, tow bar, safety cables, tow bar wiring and a supplemental braking system. I have included each of those parts below, along with a brief description of their purpose and a recommendation. Base Plate Kit: This is a custom fit...
    view full answer...
  • 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...
    view full answer...
    Image 1 for
  • 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,...
    view full answer...
  • 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.
    view full answer...
  • 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...
    view full answer...
  • 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...
    view full answer...
  • 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.
    view full answer...
  • Complete Flat Tow Setup for a 2019 Jeep Grand Cherokee
    We do have many tow bars that'll work great with your 2019 Jeep Cherokee, however in order to determine that I would also need to know which base plate you currently have. If you're interested in a complete flat-towing setup, you're going to need: - A tow bar like the Roadmaster Nighthawk All Terrain, Non-Binding Tow Bar w/ LED Lights # RM-676, - A wiring harness like the Curt Universal Tail Light Wiring Kit for Towed Vehicles # C63CR, - A base plate kit like the Roadmaster Direct-Connect...
    view full answer...
  • 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...
    view full answer...
  • 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....
    view full answer...


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Do you have a question about this Flat Tow Wiring Harnes?


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 Amanda K
Updated by:
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Employee David F
Test Fit:
David F
Employee Bradley B
Test Fit:
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Employee Kristina F
Written by:
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