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Curt Circuit Protected Converter w/ SMT

Curt Circuit Protected Converter w/ SMT

Item # C56175
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Install a 4-way trailer connector on your Toyota 4Runner with this wiring harness with tail light converter. Harness splices into existing wiring. SMT construction ensures superior performance. Lowest Prices for the best wiring from Curt. Curt Circuit Protected Converter w/ SMT part number C56175 can be ordered online at etrailer.com or call 800-298-1624 for expert service.
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Curt Wiring - C56175

  • Trailer Connectors
  • Vehicle End Connector
  • 4 Flat
  • Plug and Lead
  • Curt

Install a 4-way trailer connector on your Toyota 4Runner with this wiring harness with tail light converter. Harness splices into existing wiring. SMT construction ensures superior performance.


Features:

  • Provides a 4-pole flat trailer connector for the vehicle
    • Compatible with 5-pole, 6-pole and 7-pole adapters (sold separately)
  • Hardwires to existing harness behind tail lights
  • Solid one piece construction
  • 16 Gauge bonded wire with 4-flat plug
  • Factory appearance
  • Simple do-it-yourself instructions on every package
  • Not recommended for vehicles with LED lights


Specs:

  • Wire configuration:
    • Red: brake lights
    • Yellow: left turn lights
    • Green: right turn lights
    • Brown: Tail lights
    • White: ground
  • Wire gauge: 18
  • 1-Year limited warranty


Tech Tip: It is always a good idea to apply a small amount of grease to all electrical connections to help prevent corrosion.


Warning: Overloading circuit can cause fires. Do not exceed lower of towing manufacturer rating or:

  • Max. stop/turn light: (3 amps)
  • Max. tail lights: (7.5 amps)

Read vehicle owner's manual and instruction sheet for additional information.


Surface Mount Technology (SMT) is a method for constructing electrical circuits where components are mounted onto the surface of printed circuit boards.



56175 CURT Toyota 4Runner Wiring Harness - 4 Wire

Installation Details C56175 Installation instructions

This Product Fits The Following Vehicles



California residents: click here



Customer Reviews

Curt Circuit Protected Converter w/ SMT - C56175

Average Customer Rating:  4.7 out of 5 stars   (283 Customer Reviews)

Install a 4-way trailer connector on your vehicle with this wiring harness with tail light converter. Harness splices into existing wiring. SMT construction ensures superior performance.

- C56175
by:

eTrailer gets a grade of A+. The actual part gets a grade of B-. Two of the wires arrived slightly damaged - luckily near the cut end so I didn't have to lose much length. The sticker identifying the 4 wires on one side and 5 wires on the other was upside down, so I peeled it off and reapplied (my OCD kicking in!). I wanted to keep my original quick release plugs on 1996 Jeep Cherokee Sport & was able to do that. Used heat shrink connectors between them & Curt Converter. All lights on vehicle & trailer working perfectly again!



- C56175
by:
2004 Volkswagen Jetta

I've been using this wiring harness for around a year now and it's performed amazingly. I have a 2004 VW Jetta Wagon, picked up some cheap female "pin" connectors as my taillights on my car had pins that you could just slide a connector on to. I was able to use this method to install this harness without actually cutting into any of my cars wiring. Working amazingly.



- C56175
by:

Pretty straight forward install and made easy with quick connects



- C56175
by:
1992 Toyota 4Runner

Got the product installed, everything works great. Nice compact converter easily secured inside the quarter panel.


Comments
the wiring has worked great, now to rewire the old utility trailer.
Jennifer K - 06/02/2020


- C56175
by:
1996 Jeep Cherokee

Something is defective with this unit. While the running light circuit is fine, the circuits that convert the brake and turn signals into a single circuit (the essence of the device) is intermittent; sometimes it works properly, sometime only the left light responds, sometime only the right, sometimes nothing. I believe the problem is due to a bad diode in the unit. I am experienced with these devices, so it is not an installation error. Due to the installation, I am unable to return the unit in unused condition. 1996 Jeep Cherokee. FYI- this unit was purchased to replace a similar unit that started having a different problem after ten years of use.


Comments
When a wiring harness is acting up, the first thing youll want to do is isolate the cause to the vehicle or the trailer wiring. Use a standard incandescent circuit tester like our part 40376 on each pin of the trailer connector as each function is activated. If youre not getting signal on the trailer connector pins, try testing on the input side of the converter. If the signal is entering but exiting the converter box, youll have confirmed that the converter is bad. Youll also want to ensure that the ground connection is secure. An insufficient ground can cause all kinds of odd behavior in the lighting. Ill link you to an help article on trailer wiring troubleshooting.
-- Etrailer Expert Mike L - 10/10/2018


- C56175
by:
2005 Hyundai Elantra

OK this product is great, installs quickly with the supplied tap connectors and works as expected. i installed on a 05 Hyundai Elantra. Do yourself a favor and save yourself hours of troubleshooting. take some sandpaper and scratch off the paint on the metal surface of the car. I did it inside the light access panel. Use the supplied self tapping screw to make a Solid ground or your trailer lights will not work! i took a shortcut and secured to a screw in the panel, with paint under it. While this was sufficient ground for my test light, it was not for the trailer lights. <- this really threw me off and i wasted a lot of time troubleshooting. i even thought my trailer lights were bad and got a replacement set! but no good until i grounded properly. PS tech support was AWESOME! i had to call twice, once for the hitch install, another for trailer light issue. they answered my questions quickly and even helped me troubleshooting my trailer light issue!. When it comes time to get a hitch for my wife's van, i am definitely re-ordering from etrailer.com.



- C56175
by:

Very fast shipping product as described



- C56175
by:
2005 Hyundai Sonata

Exactly as advertised, and shipped quickly. It may pay to have spare wire clips available, as the ones shipped with the packet can be a bit brittle. Otherwise it installed beautifully works great.



- C56175
by:

Good deal, fast shipping



- C56175
by:
2018 Dodge Grand Caravan

A "shade tree mechanic" perspective: Contrary to the included "tools needed" my 2001 Dodge Grand Caravan bolts were 18 MM not 17 MM. I bought a 6 point 18 MM impact socket from Lowes for about $5. You can remove the bolts with a 3/8" socket wrench and about a 12" 3/4 iron pipe as a cheater. There are two installation videos available on Youtube. 2001 and 2004. One shows removing the spare tire. You don't need to do that. Access to the driver's side mount is very tight. I could barely touch the rubber flap blocking the channel. Don't try to pull on the fish wire to force the bolt assembly past the rubber flap. I almost lost one of the bolts. I ended up using a piece of 1/4" rod bent in a U to push the rubber flap out of the way enough to get the bolt past. I was able to mount the hitch without help by balancing it on three 2 foot long pieces of firewood (rough guesstimate). I lifted one side and fastened it losely to the bolt closest to the end of the hitch, then fastened the bolt on the other side a bit more tightly. then lifted the middle of the hitch and lined up the other bolts.



- C56175
by:
Honda

I installed this on my motorcycle, a 2004 Honda VTX 1300S. The converter itself is attached beside the license plate, exposed to the weather. It has functioned flawlessly for almost a year now, through Kansas cloudburst, desert heat and mountain freeze. If I should ever need another (not likely), I will get the same model.


Comments
A year later and it still works just fine.
Alan - 11/27/2019



- C56175
by:
2003 Saturn LW300

The trailer wiring adapter worked fine on my 2003 Saturn LW300. The unit construction was excellent. I did have to spend a while finding the proper wires in areas that were practical to splice in and had to do a lot of "pinning" with a voltmeter to determine which wire carries the correct signal. This may be difficult for someone with little experience in wiring. Most connections were made in the spare tire compartment with one behind the right tail light, all within the vehicle. Overall I am very satisfied with the product.



- C56175
by:
2007 Kia Sportage

The wiring kit was quick and easy to order. For whatever reason there is not a simple plug and play trailer wiring kit for my 2007 Kia Sportage 4 Cylinder. After opening up interior panels in the rear of the vehicle I was able to splice into the existing wires with the connectors provided. The job took about an hour. I would buy from e-trailer again. George's follow up was helpful and prompt and he let me know the moment my kit shipped out.



- C56175
by:
2019 Dodge Durango

The product is WELL worth the small price paid & more! Ease of installation was great! My 19 month old daughter had to help Dad & it took us about 30 minutes. My daughter had to view every step along the way!! Basic tools, Phillips screwdriver, pliers, light/line tester & drill with bits were all that was needed. I installed it to replace the factory installed trailer harness on a 1998 Dodge Durango. SUPER easy to get to the tail light wires ( only 2 screws per light). I unplugged the light housing to make it easier to clamp into the correct wire and to find the correct wire to clamp onto. **NOTE: The wire color on the vehicle harness does not match the color code on the C56175. Thus the reason for the light/line tester!! ALSO where I mounted the converter box was in the plastic louvers inside & behind the light housings. It fit snug but was in a safe & dry place. I could not take pictures but I assure you the EASE of installation was quick, simple & great the 1st time! Absolutely no problems even for the novice! Thank-You etrailer for such a great product at such a great price!! I would highly recommend this product..



- C56175
by:
2010 Jeep Liberty

These items are just as they are said to be. Installation was fast and easy. I would highly recommend Trailer and these products. I will buy from them as the need arises.


Comments
Still very happy with this product. Hasnt given me any problems. Going to be purchasing another for my other jeep.
Ken - 12/06/2014


- C56175
by:
2006 Volkswagen Golf

I'm no mechanic and I loathe messing with electrical but I was able to watch the Curt product video on youtube and in about an hour had the thing installed and my trailer lights working. Simple and effective. Pulled my motorcycle to the track yesterday and all my lights worked! (And I was really surprised how fast this arrived. I didn't pay extra for any expedited shipping but it was on my doorstep in two days.)



- C56175
by:

Fast shipping. I believe a better choice should have been available although this worked.



- C56175
by:
Nissan Cube

Correct hitch and wiring harness for my slightly uncommon car (Nissan Cube) was easy to find on the etrailer website. Local shop installed the hitch and wiring for $205. Haven't used it yet but seems to be fine.



- C56175
by:
2004 Oldsmobile Alero

This worked great for me on my 2004 Oldsmobile Alero. If your familiar with wiring this will be a quick install for you. Every car is different so it may take you a bit to find the wires. The longest part of installing these for me is just figuring out which wire is which. I usually unhook a taillight at the connector and use a grounded testing light and then make my connections. The kit includes snap lock wire connectors, but you can solder if your application calls for stronger connections.



- C56175
by:
1999 Toyota Tacoma

Good price, product was perfect, and the shipping was quick. Problem solved. T-taps are sort of miserable, but that's on the installer, not the product - cutting, soldering, and heat shrinking is definitely the way to go. If you have a problem with your 'Yota truck lighting acting wonky, chances are very high this unit is your issue! Mount it up high, on the bottom of the bed to keep it dry and give it decent life. The harness cover is a nice touch that does not come with all of these - pack it with dielectric grease, and you'll get many years out of this. Good job, etrailer!


Comments
We have seen some wonky trailer light issues with Toyotas when adding aftermarket harnesses like this. Typically the issue is the ground. The Toyota frames do not ground as easily as other makes. Sometimes we have to move the ground or extend it to a factory ground point in order for the system to function correctly.
-- Etrailer Expert Patrick B - 03/04/2013


- C56175
by:
1999 Oldsmobile Intrigue

Fairly easy to attach just had to double check the wiring on the car and had to sandpaper away some paint in order to get a good ground connection.



- C56175
by:
1998 Volkswagen Beetle

The Circuit Protected Converter # SMT C56175 trailer lighting harness for my 1998 VW Beetle arrived within a few days and was easy to install with the include instructions! All trailer lights worked perfect the first time they were checked after the install! Great job to ALL of you at etrailer.com


Comments
From the day I installed the SMT C56175 Converter, I have had no problems at all! This is a well designed, high quality item that I would highly recommend to anyone!This item still gets a five star rating all day long!All The Best,David W
David W - 01/04/2015



- C56175
by:

Worked flawlessly on my 1992 Jeep Chero kee



- C56175
by:

The quick splice were a bit oversized for my Audi wiring. Required me to wiggle it a bit to get a good connection to the, my guess 22ga, wire. Could also use at least a few more zipties. Otherwise, this is a good kit.



- C56175
by:

great wire harness, could not have been easier for the "common man" to deal with ! came with the hitch, I paid for it, but same package so didn't have to wait for a second box.


Comments
WONDERFUL!!
Darrell N - 06/17/2015


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Ask the Experts about this Curt Wiring

  • Trailer Wiring Solution for 2011 Isuzu NPR
    While we don't have any custom fit trailer wiring harnesses that fit the 2011 Isuzu NPR we can still help with a universal fit option like the # C56175 which you'd have to wire to the taillight circuits of your NPR.
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  • Curt Trailer Wiring Harness for 2004 Volkswagen Golf has No Left Turn Signal at the 4-Way
    The wiring system on the 2004 Volkswagen Golf is a complex system. It should have combined brake, tail, and turn signal functions on one wire. This means the red and brown wires are grounded and the yellow wire attaches to the combined brake, left turn signal, and tail light wire and green connects to the combined brake, right turn signal, and tail light wire. If this is how you have it set up and there is still no left turn signal on the output side of harness # C56175 then that indicates...
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  • Trailer Wiring Recommendation for a 2009 Kia Sportage
    For your 2009 Kia Sportage a wiring kit with circuit protection is recommended. If you were to install a harness without the circuit protection like the Draw-Tite Wiring # 18252 you would most likely blow some fuses as well as potentially damage your tail light circuits. Even with your LED taillights. For an easy to install wiring harness confirmed to fit your vehicle I would recommend the Curt Wiring Harness part # C55529. This plugs into your vehicle's wiring harness, which is located...
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  • Trailer Wiring Harness With a Powered Converter for a 2003 Volkswagen Jetta Wagon
    We do have a wiring harness with a powered converter for your 2003 Volkswagen Jetta Wagon. I recommend using the Tow Ready Upgraded Circuit Protected Modulite, # 119147KIT. Since you are having power issues with your current wiring harness, I recommend removing that wiring harness completely and install the Tow Ready harness per the installation instructions. I have attached the instructions for you to look over. This harness includes a circuit tester, so I recommend using that circuit...
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  • Trailer Wiring Harness Options for a 2004 Infiniti FX35
    I do have an option for you but I spoke with Curt and they said that none of their converter boxes will work with the 2004 Infiniti FX35 therefore no, the Curt Circuit Protected Converter part # C56175 will not work. The only trailer wiring harness we have confirmed to work with he 04 FX35 is the ZCI Circuit Protected Vehicle Wiring Harness part # 119250KIT. This kit uses sensors to clamp onto the wires therefore no splicing is required. The only other option you will have if the ZCI Circuit...
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  • Trailer Wiring Options for a 2006 Jeep Liberty without Factory Tow Package
    There are a few different trailer wiring harnesses available for the 2006 Jeep Liberty without the factory tow package. I have included a link to them for you. I recommend either # 118524 or # C55382 because they plug in line with the tail light wiring on the vehicle. These are the harnesses that fit because the vehicle does not have the factory tow package. Models with the factory tow package are pre-wired with a trailer connector already and the wiring for it is under the vehicle.
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  • Trailer Wiring Harness Options for a 1997 Toyota Camry
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  • Recommendations For Adding Tail Lights To A Kuat NV 2.0 Bike Rack
    Though you will need to have a 4 Flat on your 2001 VW Eurovan, and for this I do recommend the Curt # C56175, adding lights to your Kuat NV 2.0 is definitely a good idea. I went through all our options for adding lights to a bike rack or cargo trailer, and the Curt Auxiliary LED Indicator Lights # C53201 will be the good option, but there is a potential issue. The base of the rack is not the same length on both sides and the arm the swings up and tightens down on the wheel will give...
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  • Installing Curt # C56175 Trailer Wiring Harness on 2006 Jeep Cherokee
    Because there are some plug-and-play options available like the # 118394, we don't have any footage of the Curt # C56175 being installed on a 2006 Grand Cherokee. To install the C56175, you would need to access the wiring harnesses that feed the drivers and passenger side taillight assemblies. Use a circuit tester like part # 40376 on the wires feeding the taillight as each function is activated, one by one. Start by activating the left turn signal. Probe the wires feeding the left turn...
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  • If there is a Short Circuit Will Curt Converter Box Blow or Just the Affected Circuit
    Normally when there is a short circuit it will blow the converter box no matter what the brand is. But sometimes it will only affect the one function that shorted like what you have experienced. It could go either way but regardless of what does happen you would need to replace the converter to fix the issue. We do have the plug in style T-connector # 118418 that you can use instead of a hardwire harness if you hare interested. I have linked instructions and a video for you to view. You...
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    I really wish I had a diagram specific to your 2004 Nissan Quest that shows how it would install, but the best I can do is show you a diagram that shows you what circuits the Curt Harness part # C56175 would wire to. You will need to use the included circuit tester to determine the functions of all of the taillight circuits and then wire them accordingly. I also attached a copy of the installation instructions for this harness for you to check out.
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    Image 1 for
  • Will Curt Trailer Wiring Harness C56175 Fit a 2008 Kia Sportage
    You can use Curt trailer wiring harness # C56175 for your 2008 Kia Sportage. This harness gets the power for the trailer lights from the tail light wiring on the vehicle. You will need a circuit tester to test the wiring on the vehicle to connect to the converter. If you need a circuit tester you can use # 40376, On the Curt harness the white wire grounds to a bare metal surface. Red is brake lights, yellow is left turn signal and brown is running lights. On the right side you will just...
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  • 4 Way Trailer Wiring for 2003 Nissan Sentra
    You are correct. The correct trailer wiring kit to place a 4 way connector on your 2003 Nissan Sentra is the Curt Circuit Protected Converter # C56175, which will allow your trailer lights to function in conjunction with your vehicle's brake lights, turn signals and tail lights.
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  • Wiring 4-Way And 7-Way Connector On 2004 Jeep Liberty To Tow Popup Camper
    If you are wanting a 7-way connector at the back of your 2004 Jeep Liberty and you have brakes on your pop-up trailer, and you currently have no connector installed, part # C56175, and part # ETBC7, will do just that. I have attached a helpful article that explains how to install the # ETBC7 you can check out. You will also need a brake controller. I recommend the Tekonsha Prodigy P2 Brake Controller, part # 90885. This is our more popular brake controller because it is easy to install...
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  • Wiring 1996 Geo Tracker for Flat Towing
    The # C56175 would be installed on your Tracker if you wanted to tow a trailer with it, but it will not work for towing the Tracker behind a motorhome. To wire the vehicle for flat towing there are several available systems, as you can see in the article I have linked you to. A magnetic towing light kit like # RM-2120 would be an easy to use, easy to install alternative. If you would prefer a permanently-wired alternative, the article outlines how to determine which choice is best for...
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  • Trailer Wiring Harness Recommendation for a 2007 Jeep Liberty
    For your 2007 Jeep Liberty you would want the Curt harness part # C55382 as it has been confirmed as a fit and is a plug and play option whereas the part # C56175 that you referenced is a hardwire option. I attached an install video for you to check out as well.
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  • Wiring harness kit for 2013 Kia Rio EX Sedan ECO
    Yes, the Curt Custom Fit Wiring Harness, # C56175, is the correct wiring harness for your 2013 Kia Rio EX Sedan ECO. This wiring harness will splice into the vehicle wiring behind the tail light assemblies. I have attached a link to the installation instructions for you to check out.
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    We do indeed have two plug and play trailer wiring harness options for your 2005 Jeep Liberty. If your trailer has minimal lighting- just a stop/turn/tail light for the passenger and drivers side, the Curt # C55382 would be an excellent choice. This harness has a simple installation, which would plug inline with the connectors on the back of the taillight assemblies. If your trailer has more extensive lighting, say what is mentioned above plus some clearance and/or marker lights on the...
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    There is no plug-and-play T-connector wiring harness offered for your 2014 Toyota Yaris Hatchback. Vehicles like your Yaris that are not rated by their manufacturer for towing a trailer can still use a hard-wire type harness such as # C56175 from Curt for non-towing applications such as with a cargo carrier like # C18110 and # TL21RK. The hitch offered for your Yaris, the Curt Class I hitch # C11480, can be used only with Class I-rated accessories such as 2-bike racks and cargo carriers.
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  • Installing Trailer Wiring Harness on 1999 Chevy Astro
    The 1999 Chevy Astro uses a 2 wire system that combines the brake light and turn signals onto one circuit for each side of the vehicle. A standard 4 pole like part # 18002 can be used instead of the # C56175 converter you mentioned. The converter is designed for use on vehicles that have a 3 wire system with the left turn, right turn and brake lights all being separate circuits. The easy way to tell which system a vehicle uses is to look at its tail light assemblies. If the lenses for the...
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  • Installing Trailer Wiring Harness on 2006 Scion xB
    The Curt # C56175 trailer wiring harness you mentioned is not a vehicle specific item, it can be used with many different vehicles and therefore there are no vehicle specific instructions available. To install the wiring harness, having a circuit tester like part # 40376 would be very helpful. Locate the wiring harness feeding both of the taillight assemblies. You might need to do some disassembly in the cargo area of the vehicle or remove the taillight assemblies as if you were replacing...
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  • How to Wire a 6-Way Trailer Connector to a Chevy Astro Van
    I really need to know the year of your Chevy Astro to determine the best way to install the trailer connector to the van's wiring. The Astro was produced from 1985 to 2005 so that is a big range. I can tell you that the likely functions of the wires are red or black for 12 volt power, white for ground, brown for running lights, yellow for left turn signal/brake lights, and green for right turn signal/brake lights, and red or black (whichever is not 12 volt power) for trailer brakes....
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  • Trailer Harness on 1999 Toyota 4Runner Does Not Work
    Since this is the first time you have used the connector on your 4Runner, if it has been awhile since it was installed or if it is factory then there can be some corrosion build up inside the connector preventing it from working. This happened to a friend of mine recently. Scraping out the corrosion will help. Also make sure the main ground is connected to a clean and corrosion free bare metal surface. If that does not help then use a circuit tester such as # PTW2991 to test the vehicle...
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  • Wiring Harness For 2013 Chevrolet Cruze And LED Lights
    The difference between LED lights and standard incandescent trailer lights is the amperage (current) draw they require. LED lights require far less power to operate, and some converters will not work with LED lights because they present a very different electrical load that is harder for the converter to recognize. The C56175 you referenced will work with your vehicle if it does not have LED lights. We do not recommend using it for vehicles with LED lights because of the low amperage draw....
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  • Troubleshooting Trailer Wiring for Fleetwood Pop-Up Trailer and 2003 Mazda B3000 Pickup
    A potential cause for your issue is a weak ground connection. Trace the white ground wire from your 4-pole back to where it attaches to the vehicle frame. This ground must be secured to a clean and rust-free spot on the frame. If necessary sand off the rust/dirt from that grounding point and reattach the white ground wire or relocate it a new spot. If this does not correct the problem then I suggest you next test your existing 4-pole trailer connector on your Mazda to confirm it is...
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    First thing you want to do is consult the owners manual of your 2005 Volkswagen Beetle to determine if there are any restrictions on towing with your vehicle. For a hitch you would want the part # 24679. I attached a set of installation instructions plus an install video for this hitch to the right. For a ball mount you will need the part # 3593, for a 1-7/8 inch hitch ball # 19256, or depending on your trailer you may need a 2 inch ball. For that you would want part # 19258. You...
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  • 4-Way Trailer Wiring Harness for 2000 Honda Civic EX
    Yes the Curt Circuit Protected Converter # C56175 is compatible with your 2000 Honda Civic EX. It will also work with your boat trailer if it has a 4-way connector.
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  • No Trailer Running Lights On 2017 BMW X3 Using Curt Trailer Wiring Harness
    If you are not receiving power on the brown wire leading into the converter box then I would make sure that you have this wire spliced into the correct circuit which you can confirm using a circuit tester. Also, the tail lights that you will be splicing into are those located on the body of the vehicle, not the hatch as these lights can lose power while the hatch is open. It looks like you are using the Curt Circuit Protected Converter part # C56175 which Curt does not recommend for...
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  • Is Power to Turn Signals Correct For Curt Wiring Harness C56175
    Thank you for your purchase from etrailer of the Curt Circuit Protected Converter w/ SMT # C56175. If the tail lights on your Volvo act as both the turn signals and the brake lights, you would have a combined system, and yes, you have it correct. I suspect this is exactly what you have though I was unable to verify the type of system on a 1988 Volvo 240. If you do not have a combined system and the lights and turn signals are on different lights, then you have it miswired and would need...
    view full answer...

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