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Curt Circuit Protected Converter w/ SMT

Curt Circuit Protected Converter w/ SMT

Item # C56175

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C56175 - 4 Flat Curt Wiring
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  • Trailer Connectors
  • Vehicle End Connector
  • 4 Flat
  • Plug and Lead
  • Curt
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. 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 800-298-8924 for expert service.


  • All Info
  • Reviews (224)
  • Q & A (141)
  • Videos (3)
  • Photos
  • Why etrailer?

Curt Wiring - C56175

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.


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 Vehicle Wiring Harness - 4 Wire



C56175 Installation InstructionsInstallation Details C56175 Installation instructions

This Product Fits The Following Vehicles

1974 - 1974 Volvo 140 Series

1974 - 1974 Volvo 140 Series

1974 - 1975 Volvo 160 Series

1974 - 1975 Volvo 160 Series

1984 - 1993 Mercedes-Benz 190

1997 - 1998 Nissan 200SX

1984 - 1998 Nissan 200SX

1975 - 1993 Volvo 240 Series

1975 - 1992 Volvo 240 Series

1989 - 1998 Nissan 240SX

1976 - 1982 Volvo 260 Series

1991 - 1999 Mitsubishi 3000GT

1984 - 1984 Datsun 300ZX

1985 - 1996 Nissan 300ZX

1986 - 1989 Mazda 323

1987 - 1995 Toyota 4Runner

1987 - 1995 Toyota 4Runner

1993 - 2002 Mazda 626

2002 - 2009 Audi A8

1995 - 2006 Hyundai Accent

1995 - 2006 Hyundai Accent

1986 - 1990 Honda Accord

1984 - 1985 Honda Accord

1986 - 1988 Ford Aerostar

1986 - 1996 Ford Aerostar

1999 - 2004 Oldsmobile Alero

1999 - 2004 Oldsmobile Alero

1993 - 1997 Nissan Altima

2004 - 2006 Kia Amanti

1989 - 1994 Isuzu Amigo

See All Vehicle Fits

California residents: click here


Video of Curt Circuit Protected Converter w/ SMT


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




Video Transcript for Curt Wiring - Trailer Connectors - C56175 Review

Today we're going to be reviewing part number C56175. This is the Curt Circuit Protected Tail Light Converter with surface mount technology. The SMT technology is just a method for constructing electrical circuits where components are mounted onto the surface of printed circuit boards. This unit is designed to convert your vehicle's light functions to be used to property tow, using a 4-way flat trailer connector. This unit does provide the 4-pull flat trailer connector for the vesicle. It's got the nice little dust cap on it, so it's going to protect the connection points. To see if this fits your particular vehicle, you can use the fit guide, located right here on our website.

It's a very quick and easy installation. It's a solid 1 piece unit so it just has the exposed wires, everything is pre-assembled. Basically, all you have to do is make the connections and get everything located in the right spot. Pretty simple operation. Comes with some nice detailed instructions.

Got some photos in there to walk you through the installation and to find the location of all the connections that you need to make. It's made from 16 gauge bonded wire with a 4-flat plug. It's going to give it a nice factory appearance. It's a simple do it yourself instruction, or installation. All the instructions are located on every package, so again the connection points are highlighted and indicated in the instructions based on the type of vehicle that you have. This unit can be used with 5-pull, 6-pull, or 7-pull adapters. Just keep in mind, it is not recommended for vehicles with LED lights. Here in this package, it's going to come with 4 Scotchlok connectors.

It's going to come with 2 zip ties, and it's going to come with a self tapping screw for the ground wire connection. You can see here that on the white wire, it's going to have that ring terminal already located on it. That way you can do an easy ground connection. Just make sure you're getting it to a nice clean surface on the vehicle. It's also going to come with 2 sided adhesive tape. That's designed so that way you can mount the converter box to a nice flat, clean location.

A little tech tip, is you always want to apply a small amount of grease to the electrical connections to help prevent any corrosion. You can find some dielectric grease right here on our website. I believe it's underneath the related items on the right hand side of your screen. Also, keep in mind that overloading a circuit can cause fire, so you do not want to exceed the lower of either the telemanufacture 00:02:23 rating or the max stop and turn light, which is going to be 3 amps, or the max tail lights, which is 7.5 amps. To go over the wiring real quick, on this unit, the wiring codes are all indicated right here on the converter. The brown wire is going to be for your tail light circuit. The yellow is going to be for the left turn circuit. Red is your brake light circuit. Green is for the right turn circuit. Then your white wire is going to be for your ground. Again, make sure this is a fit for your vehicle. You should have plenty of wiring as long as the vehicle is in the fit guide for this particular converter. It's just going to allow you to tow properly with all the lights functioning as they should, using the 4-way flat trailer connector, which is already included on 1 side of the converter box, coming out here. Plenty of wire. That way you can get it to where it needs to go. I believe that's going to do it for today's review of part number C56175. This is the Curt Circuit Protected Tail Light Converter. .


Customer Reviews

Curt Circuit Protected Converter w/ SMT - C56175

Average Customer Rating:  4.7 out of 5 stars   (224 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:
2004 Hyundai Sonata

Product was great del was great but i was looking around and seen product price had dropped in four days really this is not good business will never buy anything from them again and being a full time RVer im around alot of people that buy products like this 421428



- C56175
by:

My etrailer order was shipped promptly. etrailer contacted me several times by phone and via email after I placed the order (and after the order was shipped and delivered) to make sure everything was OK. All of the items I ordered are of high quality and good workmanship and I am very happy with the unusually high level of service and communication from etrailer staff. The Sway control ball was easy to install and works great. 420973



- 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. 117895



- 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. 109323


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

7899

- C56175
by:

Wiring instructions were okay. I went to the dealership to get more information. The hitch was great. didn't need to loosen muffler. Two if us manhandled the hitch in place. 586216



- 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. 573190


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.

-- Mike L - 10/10/2018

44491

- 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.. 95441



- 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. 90890



- C56175
by:
2008 Kia Spectra5

I love it. I had to go from a 5 wire car (kia Spectra5) to a 4 wire trailer and this was the right part for the job. 5 wire car - left turn, right turn, running lights, brake and ground. 4 wire trailer - brake and right turn are on same wire, brake and left turn are on same wire, rinning lights and ground. 338141



- C56175
by:

very fast shipping excellent product. Thanks 574243



- C56175
by:

Great service. Fast shipping and information. Very pleased with product. 126560


Comments

Product installed relatively easy. All lights work as they should. Used small voltamp meter to check wires before splicing. Works like a charm.

Ken M - 04/22/2015

11004

- C56175
by:
1997 Honda Civic

I have been ordering from etrailer.com for over 10 years. They have always provided exceptional service and great products. 374744



- C56175
by:
1987 Suzuki Samurai

I just got products today via ups 8 days (2000 miles west calif.) & 1day usps. The box opened nicely , product looks nice in their pretty packaging. I’ll work product to my car and boat trailer in my own sweet time , should be no trouble. I would like to think all will work just peachie. Thanks 567236



- 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. 84824



- C56175
by:

Has been in service a full year now easy install no problems at all... 616935



- C56175
by:

Easy install. Solved a long term problem I had and it is still in use. 604499



- C56175
by:

Outside of the package being opened by the shipping company all is fine 603098



- C56175
by:

Timely delivery and was easy to wire up. 601097



- C56175
by:

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. 584619



- C56175
by:
1994 Jeep Cherokee

Easy to install and worked.. 556929



- C56175
by:

The videos are the best. They've allowed me to install two sets of hitch wiring myself with the confidence that I could do it. And it was just as the video showed. I most likely save close to $150 installing the two myself. The instructions were great, but the video s are the key. 555599



- C56175
by:

Thank you! Well done web-site. Friendly and helpful customer service over the telephone. Speedy delivery. Excellent, high quality product. Great price. Outstanding service and product. We appreciate you! 541821



- C56175
by:
2018 Mazda 3

Great and easy install 518669



- C56175
by:
2016 Mazda 3

Once I pulled the bulb and used a meter to determine which socket was the positive connection for each function, the assembly was easy. Great low-cost option. 515762



- C56175
by:

Works great and the people are very helpful with any questions you may have! 512084



- C56175
by:

Have enjoyed using your products and as soon as the snow melts here will probably be picking up some more! 477470



- C56175
by:

Installed easily. etrailer had an informative, straight to the point installation video that I followed to the letter, which resulted in a perfect install. No issues. 459149



- C56175
by:
2002 Toyota Celica

Easy to wire, worked great. Wired it in no time, after work in the dark. 447746



- C56175
by:

Product didnt work and never recieved a reaponse after contacting support 446487



- C56175
by:
2004 Volkswagen Jetta

The wiring harness was exactly as described and it works perfectly. Very easy and straight forward instructions. Thank you etrailer for fast and reliable service and support. 429460



- C56175
by:
1996 Mercedes-Benz E-Class

Easy installation. Very happy with the result. Strongly recommend it. 425063



- C56175
by:
2008 BMW X3

Liked how easy y install. 423492



- C56175
by:

I buy one a year thats all they last 417882



- C56175
by:
1993 Volkswagen Eurovan

Product arrived on time and in good order. Installed easier than I thought it would 417460



- C56175
by:
2006 Dodge Ram Pickup

The wiring harness above worked great, couldn't have been any easier to order and install 413698



- C56175
by:
2001 Mitsubishi Montero Sport

Super easy to install. Great construction materials. Strong cables. Work great with my boat trailer. 413353



- C56175
by:

very simple to install 408830



- C56175
by:

Got the tires, wheels, lights, and wiring kit to rebuild an old utility trailer. The website has a wealth of info to help find exactly what was needed. Michelle S. was very helpful (and friendly!) in resolving a delivery question. 409273



- C56175
by:

Left info about this as well when I did the reiview on the hitch. 404889



- C56175
by:
2004 Mazda Tribute

Product fit my 2004 tribute exactly. 397948



- C56175
by:
1999 Mazda Miata

Wiring was straight forward and simple, will definitely use these products again. 390700



- C56175
by:

Fast shipping. Straight forward install. 384468



- C56175
by:
1999 Audi A4

Came fast, hooked up fairly easy, most importantly, works fine with all trailer kites working and no blown f uses 375377



- C56175
by:
2012 Hyundai Accent

Control box and wires work perfectly. Had some problems with the splice connectors and ended up soldering, but overall great product. 373494



- C56175
by:
1995 Mazda Miata

Installed the product on a 1995 Mazda Miata. I tow a small autocross trailer to events with extra wheels, tools, etc. Have had no problems with the converter at all. Works as advertised. 373179



- C56175
by:
2004 Mazda Tribute

etrailer.com is one of the great ways to do business on line. Fast service, good follow up, great products. 355679



- 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. 352216



- C56175
by:
2002 Nissan Quest

Easy votage lamp pliers and its done 350050



- C56175
by:

WORKED GREAT - ALL OK 349235



- C56175
by:
2005 Volkswagen Jetta Old Body

Item was shipped with hitch (quickly & in good order). It was my 3rd such installation for like item. Good directions for installation. I'm please with it. 348338


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  • Stop Light Wire Connection On 2004 Saturn Vue When Installing 4-Way Connector
  • You will need to use a circuit tester like part # 40376 and test the wires you are using to connect the Curt Circuit Protected Converter w/ SMT, part # C56175. Although it is normally standard, auto manufacturers can use different color wires for any of their circuits, which is why we always suggest testing the wires by function and not by color. The red wire should be connected to the wire that shows current when the brake pedal is pressed.
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  • Hitch Recommendation for a 2007 Mazda 3 Speed to Tow a Small Boat
  • The Draw Tite Hitch part # 24816 that you referenced has towing capacities of 2,000 lbs total trailer weight and 200 lbs of tongue weight. Most likely your boat and trailer would fall under that based on the picture you submitted, but you really need to determine the weight of your setup to be certain. I attached an install video for this hitch for you to check out. For trailer wiring you would want the Curt Wiring Harness part # C56175. For a ball mount you would want the Sportframe...
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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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  • 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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Info for this part was:

Photos by:
Theodore B
Expert Research:
Michael L
Expert Research:
Sarah L
Video by:
Andrew K
Expert Research:
Michael H
Expert Research:
Jameson C
Video by:
Joshua S
Test Fit:
Nicholas E
Video Edited:
Jacob T
Expert Research:
John H
Updated by:
Adele M
Expert Research:
Adam R
Video by:
Dustin K
Photos by:
Jim W
Expert Research:
Jeffrey L
Video Edited:
Chris R
Photos by:
Zach O
Updated by:
Sarah W
Test Fit:
Andrew S
Updated by:
Kristina F

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