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7-Way to 4-Way/5-Way Trailer Adapter for Vehicles with Lamp-Out Sensors Towing Trailers with LEDs

7-Way to 4-Way/5-Way Trailer Adapter for Vehicles with Lamp-Out Sensors Towing Trailers with LEDs

Item # C35FR
Retail:$41.23
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Shipping Weight: 0.31 lbs
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Curt 7-way connector to 4-way or 5-way flat connector is designed for use on vehicles with Trailer Lamp-Out sensors when towing a trailer equipped with LED lights. Great Prices for the best trailer wiring from CURT. 7-Way to 4-Way/5-Way Trailer Adapter for Vehicles with Lamp-Out Sensors Towing Trailers with LEDs part number C35FR can be ordered online at etrailer.com or call 1-800-940-8924 for expert service.
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  • Reviews (72)
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  • Videos (2)
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CURT Trailer Wiring - C35FR

  • Wiring Adapters
  • Multi-Function Adapter
  • 5 Flat
  • 4 Flat
  • Plug Only
  • 7 Round - Blade
  • CURT

Curt 7-way connector to 4-way or 5-way flat connector is designed for use on vehicles with Trailer Lamp-Out sensors when towing a trailer equipped with LED lights.


Features:

  • 7-Way RV style adapter to 4-pole and 5-pole flat trailer connectors
  • Designed for use on vehicles with Trailer Lamp-Out sensors - such as Audi, Mercedes-Benz, Porsche, and Volkswagen vehicles with the factory tow package
  • Plugs into a 7-way connector on the vehicle and 4-way or 5-way flat connector on the trailer
  • 1-Year limited warranty


57004 Curt 7-Way to 4-Way and 5-Flat Trailer Adapter for VW, Audi, Porsche, and Mercedes-Benz Towing Trailers with LED Lights





Video of 7-Way to 4-Way/5-Way Trailer Adapter for Vehicles with Lamp-Out Sensors Towing Trailers with LEDs

Videos are provided as a guide only. Refer to manufacturer installation instructions and specs for complete information.




Video Transcript for Curt 7-Way to 4-Way/5-Way Trailer Adapter Review

Hello neighbors. It's Brad here at etrailer. And today we're taking a look at the cut seven to four and five pole adapter. So as the name implies you are able to adapt a factory seven way to a four and five pole. And that's really nice because a lot of vehicles will have the factory seven way on there but maybe not the four pole. So if you look came to hook up to a trailer and realize that they have a four or five pole, you might be out of luck or have to run additional wire to permanently mount it.

Well, that's where this comes into play. So that's gonna allow you to be able to have your seven way, your four pole, as well as your five pole just with plugging into the factory seven lane. Now, sometimes your towing vehicle will not recognize the LED lamps on your trailer. And that's where this is great too as plugging that in is gonna allow this to send that signal to your vehicle making sure that your lights are actually working with your signals. So like our neighbor here they have a trailer with a four pole but they got a new vehicle that has a seven way.

So instead of having to run all new wiring for it you can simply plug this into the factory seven way. You can take your four pole and plug it in or if you have the same vehicle but you're towing a different trailer. This gives you that same ability. So having this is going to allow you to hook up electrically to those trailers. So now let's go ahead and test it.

So first I'm gonna start with my running lights. Next I'm gonna do my left turn signal, my right turn signal. And then finally my brakes. Now this neighbor also toes, a boat trailer. So having the five pole is gonna be really nice for the surge lockout as well as reverse light.

Now, for some of your foreign vehicles or high end vehicles that have LED taillights sometimes they don't have enough power to power the trailer lights. Well, this is gonna help with that. Allowing that to give it enough juice to be able to still retain your lights on the trailer. Something that's really nice about this is the size and that if you normally tow a seven pole you can simply swap this in whenever you're picking up a different trailer and need to hook up or really you can use this to hook up to any trailer. You have that ability and you can keep this in your glove compartment until you need it. And that was a look at the cur seven, two, four and five way adapter..

Customer Satisfaction Score:


Customer Reviews

7-Way to 4-Way/5-Way Trailer Adapter for Vehicles with Lamp-Out Sensors Towing Trailers with LEDs - C35FR

Average Customer Rating:  4.7 out of 5 stars   (72 Customer Reviews)

Curt 7-way connector to 4-way or 5-way flat connector is designed for use on vehicles with Trailer Lamp-Out sensors when towing a trailer equipped with LED lights.

by:

Incredible service by e-Trailer and specifically by Emily who answered my questions even on Sunday! She was knowledgeable about the product and knew exactly what I needed to solve the problem with the lights on my trailer. I would do business with e-Trailer again in a heartbeat. They are the best!!!



by:

When my 4-pin trailer light plug was plugged into my Jeep Grand Cherokee (GC)'s 4-pin connector, the GC reported (on the dash and via a highly annoying beep every time I hit the brakes!) that the LED trailer lights were out, presumably because LED lights don't draw enough current (don't have enough resistance). When using this adaptor that plugs into the GC's 7-pin connector and adapts to my 4-pin plug, problem solved! (I had plugged into another trailer that had incandescent lights, and I didn't have a problem. So I can use this adaptor when I'm pulling a trailer with LED lights, and not use it when I'm pulling one with incandescent lights...perfect!)



by:

Product as described and works as it should. I have this adapter on a 2008 Mercedes ML320 CDI and a 2008 Mercedes GL320 CDI. I have hooked both suvs into uhaul trailers with led lights and everything is working good.

Dini

7/3/2023

Still Great after a year. I couldnt be happier! Great for cars with no led lights to hook up trailers with LED lights



by:

Exactly what I needed for my audi trailer lights now work perfect



by:

Well built and works well with my OEM Toyota Tacoma towing package.



by:

Works great and solved the trailer light issue with my 2020 GMC Sierra.



by:

Works great on my 2008 ML320 oem traile r.

Dino

9/6/2023

Still working great. I keep in my trunk as part od my car kit.

Etrailer Expert

Mike L.

10/26/2023

@Dino We're glad your # C35FR trailer connector adapter is working well for you!


by:

Works great!



by:

The product was exactly what I needed. Thanks for the help.



by:

Fixed the issue I had with my Mercedes GL550 not switching to towing mode and enabling all the LED trailer lights!



by:

Works like a charm.



by:

Was having a dilemma about how to address the hyperblinking and other issues with my trailer LED lights. This worked perfectly, and was quick and easy. Seems to be a well constructed product as well. 2021 Sprinter



by:

I ordered a series of parts to use a hitch extender for my truck camper. The process was easy, the online specs and details ensured I ordered the correct parts. Everything works as advertised a year later. I’m pulling a 16’ enclosed Sure-Trac trailer for my UTV and it lights up the night. Thanks etrailer for an easy process.



by:

Works well.



by:

Doesn't work with my 2021 GMC 3500 HD Sierra. The 7 way works with trailers but I can't get the adapter 4 way to work with LED lights. The truck sees that there is a "trailer" attached but the LED's don't work. If I put the LEDs on a 12V battery they all work brilliantly.

Called CURT. They didn't know what would allow LEDs to work with my truck.

Looking for a solution.

Etrailer Expert

Brooke M.

8/3/2022

A simple and perhaps silly thing to do would be to make sure that everything is properly seated on both the trailer side and vehicle side. Additionally, this part does have a one year limited warranty you may want to look into if making sure things are plugged in all the way doesnt help.



by:

Worked perfectly



by:

Perfect match. Great quality.



by:

Did not work as advertised, Requested r efund.

Etrailer Expert

Jenny N.

5/2/2023

I wanted to reach out and see what was not working with the adapter? I would like to see if I can help.

Greg

5/3/2023

The adapter is supposed to work for cars that pull a trailer with LED lights, I plugged it in, and nothing. I plug in non LED lights and it works. How do I go about sending it back for my refund? I put in a request and haven’t seen a email regarding it.

Etrailer Expert

Jenny N.

5/3/2023

I will have our Customer Service team contact you about returning the adapter.



by:

quick service and delivery, good consultation and the product worked perfectly!



by:

This solved my tow light issues when connecting a LED light to a Volvo XC60.



by:

Problem solved! I had ordered a set of the Blazer wireless LED trailer lights for the towed vehicle behind my motorhome. They didn't work. After trying another set that didn't work then calling the manufacturer I was about to give up. However, thanks to Tommie C at etrailer, he recommended this adapter and it resolved the issue. etrailer is the BEST! Great products, great customer service, great technical support.



by:

I recently purchased this product and it solved the light monitoring system errors that I was having with my 2012 BMW X5. My trailer was equipped with LED lights and the adapter was the perfect solution.



by:

Works great. Solves the problem of LED lights triggering faults on our BMW X5. The lights work and the car electronics don't signal any faults and switch the rear parking sensors off as designed.



by:

Great service and prompt delivery!
The
7 pin trailer light connector works great and allows me to connect easily to my older wire harness.



by:

Product ended up not working very well - the funky. chinese wiring was not a straight forward hook up and i got the lights to eventuLly work, but even with an adapter it sets off the lights out computer in my car and i get no brake lights .


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Show More Reviews

See what our Experts say about this CURT Trailer Wiring

  • 7 Pole to 4 Pole and 5 Pole Adapter Compatibility with a 1997 Land Rover Discovery SE7
    The 7-Way to 5-Way/4-Way Trailer Adapter for Vehicles with Lamp-Out Sensors, part # C35FR, will fit into any standard 7-Way trailer connector. As long as the connector on your Land Rover is a 7-Way, this adapter will work.
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  • Trailer Lights Won't Work on 2011 Mercedes-Benz GL on Trailer With 4-Way
    I'm not sure why U-haul would say it's fine when it clearly isn't, but the problem with the Mercedes is that there isn't enough power draw, so you'd need to use a lamp-out adapter: - 7-Way to 4-Way/5-Way Trailer Adapter for Vehicles with Lamp-Out Sensors # C35FR This will allow the trailer's brake and turn signals to recognize the signals coming from your Mercedes. If you were already using one of these adapters (I wasn't sure if you were talking about one of those or a 4-way to 7-way...
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  • Trailer Wiring Adapter Recommendation for Audi Q7 Towing Trailer with LED Taillights
    German vehicles are notorious for not liking LED trailer taillights. Typically they won't work and a bulb out sensor will go off. We have two adapters for that. If your float has a 4-way connector the adapter you'd need is the part # C35FR or if it's a 7-way part # 20142.
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  • Wiring Adapter for 2017 Ford Super Duty with Bulb Out Sensors
    Yes, the 7-Way to 5-Way/4-Way Trailer Adapter # C35FR should correct the hyper-flashing that happens when high-efficiency LED lights are connected to a circuit that is intended for the higher power draw of incandescent lights. This should keep your bulb-out sensors from being a nuisance. In the event that this adapter does not correct the issue with your deck you can use individual load resistors at each LED light. Examples are part # DI34ZR.
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  • Adapter to Use Curt Auxiliary LED Indicator Lights with 2017 Tesla Model X
    We have 7-way to 4-way adapters that mimic the load of incandescent trailer wiring with the # C35FR that you could use with the Curt Auxiliary LED adapter part # C53201. This would prevent the error you are seeing that is preventing the lights from working.
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  • Replacement 7-way for 2009 Audi Q7 and 7-way to 4-way Adapter for Trailer with LED Lights
    You are right on both counts! The correct replacement 7-way for your 2009 Audi Q7 is in fact the Mighty Cord Replacement 7-Way RV-Style Trailer Connector for Factory Tow Package # A10-7072VP. In regards to the 7-way to 4-way adapter # 47345, there is a specific one you will want to use if your trailer has LED lights, which is the 7-Way to 5-Way/4-Way Trailer Adapter for Vehicles with Lamp-Out Sensors Towing Trailers with LEDs # C35FR.
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  • 7-Way to 4-Way Trailer Wiring Adapter for 2015 Mercedes ML350 Towing Trailer with LED Taillights
    Newer German vehicles like your 2015 Mercedes ML350 have a harder time with trailer lighting that is LED as it ends up tricking the vehicle into thinking there's a bulb issue. So the solution is a 7-way to 4-way adapter that has load resistors built in to take care of the problem. For that you'd need just the # C35FR and you'd be set.
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  • Solution to Fix Hyper Flashing Turn Signals of 2019 GMC 1500 when Towing LED Taillight Trailer
    Sounds like your trailer has LED taillights which unfortunately is causing your 2019 GMC Sierra 1500 to have hyper flashing blinkers when connected. The easiest solution is going to be the 7-way adapter part # C57003 which has the load resistors built in so you don't have to do any wiring. If instead you need to go from a 7-way to a 4-way you'd want the part # C35FR instead which has the same resistors built in.
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  • LED Light Strip Flickering When Plugged Into 4-Way Connector on 2008 Land Rover LR2
    I do have an option for you, but there is not an adapter for a 4-way connector to fix the issue you are having with the LED light strip on your 2008 Land Rover LR2. Instead you will need to install a Load Resistor in each of the 3 circuits in the light strip using the # DI34ZR. This will correct the flashing issue you are having. I included a video of the # DI34ZR for you to take a look at.
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  • LED Load Resistor for 2016 Land Rover LR4 Towing Trailer with LED Lights
    If your camper trailer has a 7-Way you need part # 20142 but if it has a 4-Way or 5-Way flat connector then use part # C35FR instead. They both offer the same solution for your 2016 Land Rover LR4 it just depends on what you have on your trailer side.
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  • Can The Lamp-Out Bypass Be Used To Gain a Reverse Signal For Mercedes Sprinter Van
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  • Troubleshooting 7 Way to 4 Pole Adapter for 2008 Mercedes-Benz GL450
    You will need part # C35FR. This adapter is recommended with most German vehicles, especially if you are pulling a trailer with LED lights. This adapter will plug into your factor 7 way on your tow vehicle and allow you to plug in back here either a 4 way or a 5 way connector on a trailer. The adapter has built in load resistors that create more draw.
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  • Disabling 2020 BMW X2 Backup Sensors
    I would talk to your local BMW dealership to see if they can do something about your sensor issue, but may be a little pricey. One possible solution would be to take a connector like this one # C35FR and plug it in. This could trick the sensors but isn't a better solution than contacting your dealership, although this is a more cost affective possibility.
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  • Recommended 7-Way to 4-Way Adapter
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  • Trailer Connector Adapter fore 2010 Nissan Frontier
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  • Will the Curt Trailer Adapter, # C35FR, Work With Standard Incandescent Lights
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  • Using Tow Ready Trailer Connector Adapter # 20142 on Ford F-150 to Resolve Lamp Out Messages
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  • Solutions for 2010 Range Rover that Doesnt Detect LED Trailer Lights
    Normally for the problem you are describing we recommend the # C35FR as it is designed to fix the problem you are describing, but we have found that this product does not work on Range Rovers for some reason. The best recommendation I could make for you would be to replace the lights on your trailer with incandescent bulbs or install load resistors on the trailer lighting circuits like part # DI34ZR. I attached a link to the right that has all of the trailer lights we offer with incandescent...
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  • Will the Curt 7-Way to 5-Way and 4-Way Trailer Adapter Work with a 2006 Volkswagen Touareg
    The 7-way to 5-way and 4-way trailer adapter # C35FR you referenced isn't recommended for the 2006 VW Touareg because it's the first generation, but I do have another option for you. Volkswagen made changes to the tow package starting in 2007 that requires specialized adapters. A comparable adapter would be the Optronics 7-pole to 5-pole flat # A75TB that would work for you. Another adapter that I recommend is the Hopkins multi-tow trailer connector adapter 7-way to 6-way, 5-way or 4-way...
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  • How to Draw Enough Power When Using LED Lights on a 2023 Ford Transit
    It is not uncommon for LED lights to not draw enough power for the 4-way or 7-way to work properly. If the # H01540 lights are not working when plugged into your 2023 Ford Transit, that is likely the cause. If you have a 7-way, you could use the 7-Way to 4-Way/5-Way Trailer Adapter for Vehicles with Lamp-Out Sensors Towing Trailers with LEDs # C35FR to correct this issue. If you only have a 4-way, you would want to add the Load Resistor Kit # DI34ZR to each of the light wires on the light...
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  • LED Trailer Hitch Cover Sending Turn Signal Light Bulb Is Out Message On 2016 Ford F-150 Lariat
    On your 2016 Ford F-150 Lariat, the problem you are referencing with your Brake and Tail Light L.E.D. Trailer Hitch Cover # FHG72VR is only seen on certain vehicles. We normally see this issue with German vehicles when they try to tow a trailer with LED lights. The issue is that the lower amperage draw of the LED lights is just enough to confuse the vehicle that it is drawing too much and because of that it wants to tell you that you have a bulb out on your vehicle, then with no amperage...
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Info for this part was:

Employee Lindsey S
Edited by:
Lindsey S
Employee Jeff D
Installed by:
Jeff D
Employee Bradley B
Installed by:
Bradley B
Employee Jameson C
Expert Research:
Jameson C
Employee Jacob T
Video Edited:
Jacob T
Employee Dustin K
Video by:
Dustin K
Employee Wilson B
Updated by:
Wilson B
Employee Michael B
Updated by:
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Employee Noah M
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