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  1. Custom Fit Vehicle Wiring
  2. CURT
  3. Custom Fit
  4. Trailer Hitch Wiring
  5. 4 Flat
  6. No Converter
Curt T-Connector Vehicle Wiring Harness with 4-Pole Flat Trailer Connector

Curt T-Connector Vehicle Wiring Harness with 4-Pole Flat Trailer Connector

Item # C55312
Our Price: $23.31
You Save: 37%
Custom Fit Vehicle Wiring

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Quickly and easily install a 4-way trailer connector on your vehicle with this custom harness. T-connector plugs directly into existing wiring - no cutting, splicing or tapping required. 1-800-940-8924 to order CURT custom fit vehicle wiring part number C55312 or order online at Free expert support on all CURT products. Great prices and Fastest Shipping for Curt T-Connector Vehicle Wiring Harness with 4-Pole Flat Trailer Connector. Custom Fit Vehicle Wiring reviews from real customers.
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  • Reviews (48)
  • Q & A (0)
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  • Why etrailer?

CURT Custom Fit Vehicle Wiring - C55312

  • Custom Fit
  • Trailer Hitch Wiring
  • 4 Flat
  • No Converter
  • CURT

Quickly and easily install a 4-way trailer connector on your vehicle with this custom harness. T-connector plugs directly into existing wiring - no cutting, splicing or tapping required.


  • Provides a 4-way flat trailer connector at the back of your vehicle to power your trailer's signal lights
    • Compatible with 5-pole, 6-pole and 7-pole adapters (sold separately)
  • Connects quickly and easily - no cutting or splicing of wires
    • Locate connection points behind rear bumper
    • Plug in T-connector
  • Comes with dust cap for 4-way flat connector
  • Limited 1-year warranty


This custom-fit T-connector plugs into your vehicle's wiring harness, which is located behind the rear bumper, along the driver's-side frame rail and near the spare tire.

Once installation is complete, the 4-way connector will be stowed beneath your vehicle, near the trailer hitch. A mounting bracket (sold separately) is recommended to keep the connector secure.

It is recommended that you use a small amount of grease on all electrical connections - the plugs on your automobile and the 4-pole connector itself - to help prevent corrosion.

55312 CURT T-Connector - 4 Wire

Installation Details C55312 Installation instructions

This Product Fits The Following Vehicles

California residents: click here

Customer Satisfaction Score:

Customer Reviews

Curt T-Connector Vehicle Wiring Harness with 4-Pole Flat Trailer Connector - C55312

Average Customer Rating:  4.9 out of 5 stars   (48 Customer Reviews)

Quickly and easily install a 4-way trailer connector on your vehicle with this custom harness. T-connector plugs directly into existing wiring - no cutting, splicing or tapping required.

1991 Chevrolet S-10 Pickup

Great product, I installed it yesterday quick and easy without cutting into the vehicle's wiring harness. I gave it four stars because I did have to replace the eyelet on the white wire for a larger one in order to use the wiring harness body ground underneath the connector.


The harness I ordered was shipped surprisingly quick and the quality of the product exceeded my expectation.I'm very happy with my purchase.

1987 Chevrolet Suburban

Fit our Fire Departments 1987 Suburban perfectly. Plug and play is great. Arrived promptly. Love the tracking with map on the website. Will be a return customer for any of our departments towing needs.


Works great, fits great! Exactly as des cribed

1987 GMC C/K Series Pickup

Fast shipping and get what u actually o rder

1989 Chevrolet Blazer

All I could say is wow! In fact, I am so pleased I'll say it backwards, wow! I received my product sometime ago and did not install it till now. Having said that, the harness resolved all my issues immediately plug-n-play! Everything worked impeccably! All my frustrations eradicated within moments! Listen all, these products are unparalleled! The customer service exemplified and shipping times are unequalled! I am one content and happy customer and will definitely be back, as well as referring all my family and friends! Extremely high recommendation. Thank you etrailer!

Eric A - 04/21/2017

1988 GMC Jimmy

Easy to install, well made

1987 GMC Suburban

Super easy install and works as designe d!!


Easiest wiring harness I’ve ever worked with. Truly custom for my pickup.


Easy as one two three. Just put in 1985 Chevy C10 4.3. and the compatible wire harness came up. Part arrived in no time. Two connections like plugging in an extension cord and it was done! Thank you.


item well described and excellent photos. Shipped promptly. excellent site and service, will certainly check etrailer out next time I need trailer parts/excessarietys. Will recommend them to anyone who asks about online trailer parts dealers.


This fit great on my 91 s10. It only has 42000 miles on it and I didnt want to splice my wires. It was 100% plug and go.

1986 Chevrolet S-10 Pickup

This harness is better than the one piece design. If one of the connecters goes bad from corrosion or wear, they can be purchased separately and soldered together.


Everything was perfect arrived very fast I spoke to Melinda on the phone great customer service she was awesome very nice I will be ordering more stuff in the future for sure thanks etrailer keep up the good work


Everything I’ve ever purchased from e-trailer has been 1st rate quality, Keep up the great job


Easiest wiring harness I've ever installed.

1988 Chevrolet Suburban

Love the connector. Made fixing my trailer lights quick and easy, simple install. Thanks again for a wonderful product.


Easy to hook up. This only took a few min, including the testing.

1989 Chevrolet Suburban

THis came in and it fit my 1989 Suburban perfect. The old one had some issues, and this new on cleared up my problems. Great product.

1986 Chevrolet C/K Series Pickup

Products were exactly as advertised, very good quality, shipped quick, and fair product/shipping fees. Thanks , and will definately deal with in the future.


Works perfect. No cutting needed.


Easy install...even a kid could do. Great product. I saved time and money by doing it myself. Customer service was friendly and fast to complete my order.


Easy install...even a kid could do. Great product. I saved time and money by doing it myself. Customer service was friendly and fast to complete my order.


Great Item Worked Perfect on my truck

Great no issues
David - 01/22/2019

1986 Chevrolet C/K Series Pickup

Product fit and worked as described. Will do business again.

Show More Reviews

See what our Experts say about this CURT Custom Fit Vehicle Wiring

  • Recommended T-Connector Trailer Wiring Harness for 1997 Chevrolet S-10 4.3L Automatic Pickup
    We do offer custom-fit T-connector 4-pole wiring harnesses for your 1997 Chevrolet S-10 Pickup. You can use the Curt part # C55312, which will plug in without any cutting or splicing of wires to the connector located beneath your vehicle, along the driver's-side frame rail. Be sure to solidly attach the white ground wire's ring terminal to a clean bare metal surface on the truck. A proper ground is essential for correct operation of a wiring harness.
    view full answer...
  • Will C55312 T-Connector Vehicle Wiring Harness Fit 1984 GMC S15 Pickup
    To install a 4-way on your 1984 GMC S15 Pickup, you will need to hardwire a connector like Draw-Tite 4-Pole Hardwire Kit, # 18252. Just use the included tester to locate the vehicle's right turn signal, left turn signal, and tail light circuit. I have included a wiring chart and install video for you. Part # C55312 is designed for the 1985 to 1990 GMC S-15 pickup so this would not work for your 1984 model.
    view full answer...
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  • 4-Pole Wiring Harness Fit for 1986 Chevrolet K30 Military CUCV Pickup
    We can help you determine if the Curt # C55312 T harness will fit your 1986 Chevrolet K30 military CUCV pickup. If you review the linked photo of these harness' connectors you'll see what you're looking for on the truck. The connector you want to find has a square cross-section and should be located along the driver's side frame rail. If you truck has no connectors on the frame rail you can still wire in a universal-fit 4-pole harness like # 18252. This kit includes a circuit tester to...
    view full answer...
    Image 1 for
  • Recommended Trailer Wiring Harness For A 1997 Chevrolet Blazer
    Though we do not have any plug and play options available for your 1997 Chevrolet Blazer we do have The 4-Pole Hardwire Kit with Circuit Tester # 18252. This harness will hardwire into your existing Chevrolet Blazer wiring, the turn and brake signals will be sent along the same wire. The ground wire will run the full length of the vehicle. I attached an installation video link below.
    view full answer...
  • How to Connect 4-way to 1991 Chevrolet S-10 Pickup
    To add a 4 pole trailer connector to your S-10, I'd recommend the Curt T-Connector, part # C55312. This custom-fit harness plugs into your Chevrolet S-10 Pickup's wiring harness, which is located beneath your vehicle, along the driver's-side frame rail. Once installation is complete, the 4-way flat connector will be stowed beneath your Chevrolet S-10 Pickup, near the trailer hitch. A mounting bracket # 18144 is recommended to keep the connector secure. It is recommended that you use...
    view full answer...
  • Trailer Hitch Recommendation for a 1992 Chevy S-10 with Roll Pan Bumper
    The Curt hitch part # 13920 is designed to fit the 1992 Chevy S-10 trucks that have the factory roll pan bumper. This hitch would fit behind the license plate so it sounds like this would be exactly what you would need. For trailer wiring you would then want the part # C55312. Since you wanted to do some towing you might be interested in etrailer ball mount kit # 989900. It comes with 2 ball mounts; one with a 3/4 inch rise or 2 inch drop and one with a 2-3/4 inch rise or 4 inch drop....
    view full answer...
  • Will Draw-Tite Trailer Hitch # 75500 Fit a 1985 Chevy Suburban
    First, the pictures that you see are of the actual Draw-Tite trailer hitch, # 75500. If you click on the third picture, you will see that the mounting brackets on either side of the hitch are actually at an angle so the hitch will fit the angled frame on the vehicle. You can also see it in a diagram in the instructions I have linked for you to view. If you plan on doing some towing, I recommend the etrailer ball mount kit # 989900. It comes with 2 ball mounts, 2 balls, a hitch pin with...
    view full answer...
  • Fit of Draw-Tite 75500 Class III Trailer Hitch on 1986 Chevy Suburban C20
    According to Draw-Tite, their # 75500 Class III hitch is a fit for a 1986 Chevy Suburban C20. If you'll be towing with the hitch, you can add a 4 pole trailer connector using part # C55312. I'd also recommend an etrailer ball mount kit, part # 989900, which includes a ball mount with a 3/4 inch rise or 2 inch drop, a ball mount with a 2-3/4 inch rise or a 4 inch drop, a 1-/78 and a 2 inch trailer ball and 2 hitch pins. A handy carrying bag is also included.
    view full answer...
  • Will Curt Trailer Hitch C14082 Allow Stock Rear Tire To Be Installed On 1987 GMC C/K 1500 2WD?
    Since your 1987 GMC C/K 1500 Long Bed 2WD has the stock size spare tire, it can be reinstalled after installing the Curt Trailer Hitch Receiver # C14082. If you are looking to tow a trailer with your truck you will also need a vehicle wiring harness # C55312 and a ball mount, hitch ball, and hitch pin and clip which can be found in the etrailer Ball Mount Kit # 989900. I included a link to the written instructions of the # C14082 and a video reviews for the other products mentioned for...
    view full answer...
  • Replacing 7-Way Trailer Connector On a 1991 Chevrolet Suburban
    For your 1991 GMC Suburban V1500 we have the Curt T-Connector Vehicle Wiring Harness # C55312 4-way flat connector that will plug and play into the factory connections. As there is not a 7-way connector with the factory connections you can use the Curt Trailer Connector Adapter # C57672 to tie into the reverse light and charge line wiring wiring on the rear of your Suburban. You will be able to connect the 4-way harness directly to the adapter to take care of the running lights, turn...
    view full answer...
  • Installing 7-Way Connector and Trailer Brake Controller on 1996 Chevy S-10 Pickup
    Since your 1996 Chevy S-10 already has a 4-Way connector in place the best way to convert it to a fully-functioning 7-Way is by installing the Universal Wiring Kit # ETBC7. This particular kit includes the 7-Way harness itself that will plug right into the existing 4-Way, plus all the additional wiring, circuit breakers, and quick-splice connectors needed to make this conversion and install a brake controller (which we'll get to later). I have attached the complete installation instructions...
    view full answer...
  • Trailer Wiring and Brake Controller for a 1985 Chevy M1008 CUCV
    Assuming that the military version of the 1985 Chevy C/K series trucks has the same tail light configuration as the civilian models you would start by installing a 4-Way connector using # C55312. If it does not have the proper connectors for this harness you would just need to hardwire in a 4-Way using # 18252. Then to hardwire in a 7-Way and a brake controller you will need # ETBC7. I have included some links that show and explain the ETBC7 installation for you. For a brake controller...
    view full answer...
  • Curt Class III # 13920 Trailer Hitch for 1997 Chevy S-10 SS Pickup With Roll Pan Bumper
    We do have a Curt Class III hitch, part # 13920 that's compatible with the roll pan on your S-10, as long as the roll pan is factory installed, and not aftermarket. The receiver opening would be concealed behind the license plate, so you'd need to cut a hole behind the plate and install a hinged license plate holder like part # 8802. You might also need the following to complete your towing system: Trailer wiring harness, part # C55312 Ball mount, part # 2923 1-7/8 inch trailer ball,...
    view full answer...
  • High Capacity Trailer Hitch for 1985 Chevy C/K Series Pickup
    The B&W BWHDRH25198 Class V hitch is indeed a fit for your 1985 Silverado. The hitch has a 16000 lb towing/1600 lb tongue weight capacity, which will be greater than the towing capacity of the vehicle, so so worries about the strength of the hitch. Assuming that your trailer has electric brakes, you'll need to install a brake controller to actuate them. I'd recommend the Tekonsha Primus, part # TK90160. The Primus is a proportional controller, which provides smooth, safe and predictable...
    view full answer...
  • etrailer Trailer Hitch Fitment on a 1995 Chevy S-10 for Light Duty Trailer Towing
    Yes, the etrailer Trailer Hitch Receiver # e44KR fits your 1995 Chevy S-10 and is rated to tow up to 4,000 lbs with a 400 lb tongue weight. I really like this hitch because of the matte black finish that not only looks more rugged but is also more durable than the classic glossy black finish against road debris. The next thing you need for your towing setup you also need the Curt T-Connector Wiring # C55312 and mounting brackets # 18144 and # C57202. This gives you a way to place the wiring...
    view full answer...

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Info for this part was:

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Updated by:
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