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

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

Retail:$38.13
Our Price: $23.67
You Save: 38%
Custom Fit Vehicle Wiring

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Custom Fit Vehicle Wiring 118315 - 4 Flat - Tekonsha
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Quickly and easily install a 4-way trailer connector on your vehicle with this custom wiring harness. T-One connector plugs directly into existing wiring - no cutting, splicing or tapping required. 1-800-940-8924 to order Tekonsha custom fit vehicle wiring part number 118315 or order online at etrailer.com. Free expert support on all Tekonsha products. Great prices and Fastest Shipping for T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector. Custom Fit Vehicle Wiring reviews from real customers.
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  • Reviews (130)
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Tekonsha Custom Fit Vehicle Wiring

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

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


Features:

  • 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 along frame rail
    • Plug in T-connector
  • Constructed of 16-gauge bonded wire
  • Comes with dust cap for 4-way flat connector


Specs:

  • Maximum amperage: 7.5 amps per circuit
  • 1-Year limited warranty


Installation

T-One Connection Location Points

This custom-fit T-One connector plugs into your vehicle'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 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.



118315 Tow Ready T-1 T-Connector - 4 Wire

Item # 118315

Installation Details 118315 Installation instructions

This Product Fits The Following Vehicles



California residents: click here


Customer Satisfaction Score:


Customer Reviews

T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector - 118315

Average Customer Rating:  4.9 out of 5 stars   (130 Customer Reviews)

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

by:
1994 Chevrolet Silverado

This harness makes wiring my 94 Chevy Silverado for my trailer lights as easy as plugging in a lamp to a wall socket. No cutting, splicing or taping of wires. It plugs in to your factory harness under the left rear side of the bumper and you just route the cable over to the center of your bumper.



by:
1992 Chevrolet C/K Series Pickup

This made my brake instillation kit extremly easy. Must have for a new 7 plole pig tail. No cutting wires it was all plug and play.



by:

It is an excellent harness and connector. i have had no problems what so ever. I t has worked great form me.



by:
1997 Chevrolet Silverado

trailer wiring was high quality and worked well on my 1997 Silverado.



by:
1997 Chevrolet C/K Series Pickup

This was a very simple plugin installation. I did have to drill a hole for a self tapping screw for the ground wire (the drill size was a little larger than what the instructions called for). Just make sure you put it where the spare tire will not come into contact with it. (I had to do it twice). I'm very happy with my new hitch and wire harness. Shipping was fast. I think I ordered it Friday morning and received it Monday or Tuesday.

John P.

12/26/2016

So far so good. No problems at all.



by:

Easy installation and works well



by:

Excellent product, easy to install, works perfectly. Needed to drill a 1/8 inch hole as opposed to the 3/32 in the instructions for the ground wire connection but a simple fix. Installed it to later connect an LED tailgate light bar.

Paul K.

12/27/2021

Still works great, high quality product.



by:

Speedy delivery and the harness was very easy to hook up. Thank you etrailer.



by:
1992 Chevrolet C/K Series Pickup

Every thing was as asdvertised. I only wish that the wiring harness was one connection greater in that I have to wire my back up lights to release the brakes on the trailer when backing up

Keilan

5/16/2013

Ken where do you plug this in on a silverado? Where on the wiring harness? Thanks.

Patrick B.

5/20/2013

The main tail light harness underneath the vehicle. It will be along the inside of the driver side frame rail at the rear.


by:
1993 Chevrolet C/K Series Pickup

I received the wire T-harness for the rear lights on my 1993 Chevrolet truck Wednesday and I installed it Thursday, March 23. It was easy to install and it works fine. Thank you for your prompt service.

Michael S., Columbia, TN.

Michael S.

3/26/2018

Yes, I installed the wiring t-harness on my 1993 Chevrolet Silverado on 3-23-2017 and it is working fine. I hooked-up my trailer last Thursday and the lights are working fine. I should have purchased it a long time ago.



by:
1994 Chevrolet C/K Series Pickup

The trailer light hook-up for my '94 Chevy truck came very quickly, even though I picked economy shipping. I was delighted that it came so fast, but it was a few days before I got the time to install it.
I was expecting to take apart my lights and hook in behind the light bulbs like I did on my Ford E250 which was simple enough. (The harness on the E250 is still going strong several years later by the way.)
This light kit only took about 15 minutes to install. The instructions were simple and easy to follow. What took the most time was rounding up a couple of zip ties and drilling a little hole to put a ground screw in. This was so quick and very, very easy.

I do lawn mowing and landscaping. I use my trailer a lot. The good people at the package store where I bought my trailer were suggesting a person to custom install a light harness on my vehicle for a little more than a hundred dollars. This etrailer kit cost me less than $$.00 all told, part and shipping included.
These people at etrailer are so very helpful and can save you so much money and frustration. You owe it to yourself to give them a try.

Thanks etrailer. Awesome product and service. I will definitely use you again. In fact, I expect to order a frame mount hitch receiver from you later this spring.



by:
1989 Chevrolet C/K Series Pickup

Everything I needed was there. Instructions were clear and easy to understand. Lot of work but results were professional.



by:
1997 Chevrolet C/K Series Pickup

Exactly what I ordered. A no brainer. Literally a plug and go deal here. Absolutly no splicing or destroying your factory wire harness. The other trailer light connector styles require you to cut and splice in a wire allowing for moisture to cause corrosion. A little electirical grease before connecting it and my connections have been corrosion free for over a year now. Very satisfied. Have recomended time and time again. I pull trailers every day and this product has held up. Plan on purchasing 4 more in the future for my other trucks.



by:
1996 Chevrolet C/K Series Pickup

Great shopping experience, fast delivery and no splicing my wiring harness I used this to make my 60" led lights on the truck bumper work... HAPPY HAPPY HAPPY

Tony H.

11/10/2016

Still working great with no problems still satisfied



by:
1998 Chevrolet C/K Series Pickup

Installation on my Chevy C1500 was a breeze. Simple plug and play, secured w/ zip tie then attached ground to body, adding a dab of electrical grease (wire to body). I purchased the flat 4 mounting bracket, drilled two holes , and mounted it on the bottom of bumper near the ball. A dab of electrical grease on the flat 4 dust cap and it's good to go. I must of looked at it four times afterwards, thinking, man that looks good. Just buy it, you've already been thinking about it.



by:
1994 GMC C/K Series Pickup

everything was perfect. Great price, accurate fit for my truck. The Tekonsha trailering wire harness kit went on easily and works perfect. Now when i trailer i have lights for safety. Thanks guys



by:
1998 Chevrolet C/K Series Pickup

Ordered the Curt trailer hitch and trailer wiring harness for my 1998 Chevy . Was shipped out the day I ordered. Extremely pleased with products! Was searching for a no drill install and this was perfect. Bolted right up and harness was a simple unplug and plug back in. Total install time was 45 minutes and that was by myself laying on garage floor. Price was on point as well. I highly recommend etrailer.com .



by:

It looks great I will install the hitch tomorrow



by:
1997 GMC C/K Series Pickup

The led trailer lights and wiring harness all worked well! Cured my trailer light
Problem totally!!



by:
1993 Chevrolet C/K Series Pickup

Stupid me!!! I have been wiring trailers on my own for years...
Finding the trailer wiring set that simply plugs in on etrailer.com saved me time, frustration and laying in the dirt! On top of that, it was delivered quick and works great...

Thanks etrailer
Larry Bowers / Utah



by:

I was a little concerned when I opened the package and the product I received did not look exactly like what was pictured in the catalog, but it fit perfectly. I've had an on-again-off-again problem with my "professionally" wired trailer lights from day one. The eTrailer wiring T eliminated a rat's nest of wires, fixed my problem, I did it myself, and I saved big bucks!



by:
1998 Chevrolet C/K Series Pickup

Heavier built than basic plug and play 4 way harness. 10 min to install.

Kevin

7/5/2020

I haul trailers at least once a week .This product has been great. It has worked every time, no problems



by:

Everything arrived and fit perfectly. Exactly as advertised.



by:
1998 GMC C/K Series Pickup

Exact fit for my 1998 GMC truck. Installation was easy and straight forward as advertised. Will be returning to etrailer for all my future truck and trailer needs.

Dick D.

10/1/2016

The item that I purchased a year ago is as great today as the day I installed it. This is a great product.



by:
1988 Chevrolet Silverado

Great company to buy from fast service and shipping.. product was exactly as advertised. I bought a wireing harness for my 1988 chevy silverado to hook my pop up to and the harness fit perfect. I will defenitley be shopping at etrailer.com again.


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Show More Reviews

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

  • Trailer Lights Flash with Vehicle Flashers and Go Out when Stepping on the Brakes
    So it sounds like the flashers are tied into the running light circuit on the truck side. I am not sure it this is how it is supposed to be or if there is a wiring issue on the truck. The correct 4-Way for a 1998 GMC C/K series is # 118315. It just plugs in line with the vehicle tail light harness, see instructions link. Applying the brakes may be causing the trailer lights to go out while the flashers are on because it is too much draw on the wiring which is causing the lights not to...
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  • Fit of Tow Ready T-One Connector # 118315 on 1989 Chevy K1500 w/ Custom Bumper
    The Tow Ready # 118315 is designed to fit a 1989 Chevy K1500 with a stock bumper. The lamps on your bumper should plug into the factory wiring harness on the driver's side frame rail. The # 118315 will plug inline at that connection as long as it hasn't been altered. If your connector looks like what's shown in the photo and video I've linked for you, the # 118315 should fit without cutting or splicing.
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  • Connection Point for T-One Vehicle Wiring Harness 4-Way Trailer Connector # 118315, 1998 GMC Pickup
    The T-One Vehicle Wiring Harness with 4 Pole Trailer Connector, # 118315, is a fit for your 1998 GMC pickup. The connection point could be difficult to find unless you know where to look. What you are looking for is a connector that leads to your taillight wiring. It should be located along the driver side frame rail near the bumper. I have included a link to the installation instructions below.
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  • Will Curt Trailer Hitch be Hidden Behind License Plate on 1997 Chevy C/K Pickup with Roll Pan Bumper
    Yes, the Curt Trailer Hitch, # 13942, will be hidden behind the spring loaded license plate on your 1997 Chevrolet C/K Series Pickup with a roll pan bumper. I have included a link to the installation instructions for this hitch for reference. This is the only hitch specifically designed for use if the truck has a roll pan. For wiring, you will need Tow Ready Custom Fit Vehicle Wiring, # 118315. I have included a link to the installation details and video for reference.
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  • How Can You Tell if a 1997 Chevrolet Silverado Has Factory Trailer Wiring
    The 1997 Chevrolet Silverado has some of the wiring in place to connect a brake controller, but it does not have the provision for plugging the controller in under the dash. There is an orange and blue wire that is run from the rear drivers side frame rail to the engine compartment. The blue wire carries the brake controller output, and the orange wire if for the 12 volt trailer lead. The ends of these wires would connect to the trailer connector at the rear of the truck. In the engine...
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  • Will 4 Pole to 5 Pole Trailer Wiring Adapter Fit a 1995 GMC C/K Series Pickup Truck
    Yes, all you will need is to plug the 4-Way end into an existing 4-Way on your 1995 GMC pickup and then use the included quick splice connector in adapter # 20036 to connect the blue wire to a reverse light wire on the truck. Then it will activate the electric reverse lockout on the surge coupler when the truck is put in reverse. If you need to add a 4-Way to the truck you can use # 118315.
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  • 7-Way and 4-Way Recommendation for 1993 Chev C1500
    For your 1993 Chevy C1500 you'd want to start with the 4-Way kit part # 118315 which is a confirmed fit and then to convert it to a 7-way/4-way combo you'd just need the # 37185 and you'd be set.
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  • Trailer Wiring Harness for a 1994 GMC C/K Series Pickup Truck
    In 1994 the Sierra was just a trim level of the C/K series GM trucks. It wasn't until 1999 that the Sierra started to take the place of the C or K designation and that transition was complete in 2000. For a trailer wiring harness that will fit your truck I recommend the Tow Ready harness # 118315. It plugs in line with the vehicle tail light wiring. I have linked a video showing an example installation for you. A mounting bracket such as # 18144 is also recommended.
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  • Wiring to Add 5-Way Harness on 1992 Chevy Silverado to Connect to Boat Trailer
    To add a wiring harness to your 1992 Chevy Silverado for your boat trailer you need to first add a 4-flat, the T-One Vehicle Wiring Harness # 118315; I've attached a link showing this harness being installed on a similar truck for you to check out. From there you need an adapter, the Tow Ready 4 Pole to 5 Pole Trailer Wiring Adapter # 20036 to give you a 5-flat on your Silverado.
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  • Recommended Trailer Hitch Receiver For 1995 GMC Sierra K1500
    As long as the tire on the 20" spare is the height as the factory tires on your 1995 GMC Sierra K1500, and your truck has the standard or step bumper you will be able to use the Draw-Tite Trailer Hitch Receiver - Multi Fit - Class IV - 2" # 37130. This hitch has a 700lb tongue weight rating and a 7000lb trailer weight rating when NOT using a weight distribution system, or 1200lb tongue weight and 12000lb trailer weight if you are using a weight distribution system. Keep in mind that these...
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  • Trailer Hitch Recommendation for a 1996 Chevy C/K Series 1500 Pickup Truck with Dual Exhaust
    The Curt Trailer Hitch, # 13942, is designed to fit if the truck has a roll pan. There is no restriction if the truck has dual exhaust. I have included a link to the installation instructions for this hitch for reference. This is the only hitch specifically designed for use if the truck has a roll pan. I have included a link to all of the trailer hitch options for a 1996 Chevy C/K 1500. Just select your specific truck style from the pull down menu under where it reads Select Vehicle Style...
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  • Recommended Trailer Wiring Harness For 1992 Chevrolet 1500 Pickup Truck
    To add an additional 4-way connector on the 1992 Chevrolet 1500, I recommend the T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector, part # 118315. This plugs into the connection points along the frame rail under the truck on the driver side. There is no cutting or splicing into the truck wiring to install this. When working with electrical connectors I recommend using dielectric grease like part # 11755. This keeps dirt and moisture out of the electrical connections and...
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  • Will Draw-Tite Trailer Hitch Fit 1996 Chevrolet C/K Pickup With Step-Side Bed
    The Draw-Tite Max-Frame Trailer Hitch Receiver, part # 75099 is designed to work with all models of the 1996 C/K pickups with a standard or step-bumper, so it will work fine with your step-side. This is a Class lll hitch and it has a 2-inch receiver opening. If you plan on doing 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. It also includes a 1-7/8...
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  • Determining the Function of a Wire Labeled YEL FEED BRK SW on a 1994 Chevy C/K2500
    The wire you are referring to is probably the center high mount stop light wire or CHMSL. This wire would be used for a third brake light function for example on a camper shell. You can test it by using a circuit tester like # PTW2993. If the wire shows a signal only when the brakes are pressed, and not when the turn signals are on or flashers are engaged, then it is the CHMSL. If it does show a signal with the blinkers and flashers then it is a taillight brake light wire that also carries...
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  • Troubleshooting Trailer Wiring Issues When Vehicle Headlights Are On
    It sounds like there is too much of a draw when your headlights are on and that makes everything else work improperly. There are two possibilities, but it sounds like a bad ground wire versus a bad wiring harness. I recommend checking your ground to make sure it is free of corrosion and rust and has a bare metal to metal connection. One easy way to test this is to take a length of wire and just connect it to your negative battery terminal and then the location of your ground wire on...
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  • Power Wire for a 7 Way on a 1996 Chevy Pick Up
    If your 1996 Chevy pickup did not come with a factory 7 way, you will need to run a power wire from the battery back to a 7 way that you will install. However, if your trailer does not need an auxiliary power supply, you can omit running the power wire up to the battery. I assume you will be needing to add a 7 Way plug. If you already have a 4 Way trailer connector, you will simply need part # ETBC7 to complete the installation of a 7 Way. If you do not already have a 4 Way connector...
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  • Trailer Wiring Does Not Work on a 1999 Chevy Silverado or C/K Series Pickup
    Does the converter you are using by any chance require a direct connection to the vehicle battery to actually power the trailer lights? Some converters are powered and they get the signals from the tail light wiring but the power comes from the vehicle battery. It could also be a bad converter box. Use your test light to test the wires going into the converter box to make sure they are correct. If they are not correct that indicates a problem with the truck wiring. If they are correct...
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  • Adding a 4-Way Flat Trailer Connector to a 1992 Chevrolet C/K Series Cab and Chassis
    A 9-pole to 4-Way flat adapter is not available since it is a combination that is quite rare. You would either have to make one or install a separate 4-Way. The easiest solution would be to install the Tow Ready Custom Fit Vehicle Wiring, # 118315. I have included a link to the installation instructions for you. The 4-Way plugs in line with the tail light wiring on your 1992 Cab and Chassis model Chevy C/K.
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  • 4 Pole Trailer Wiring Harness for 1991 Chevy C/K Pickup Truck
    The Converter # HM48925 is indeed designed to tap directly into a vehicle's taillight circuits. Your truck uses a combined wiring system, so the converter box would be providing circuit protection to isolate the truck wiring from any short circuits that might occur in the trailer wiring. To install, the green wire taps into the right turn circuit, the yellow wire into the left, the brown into the taillights and the red and the while would be grounded to the truck. There is a plug and play...
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  • Parts Needed for Trailer Brake Controller Installation on 1998 GMC C/K Series Truck
    The 1998 GMC and Chevy C/K series trucks weren't prewired for a brake controller like the newer trucks were, so you'd need to hardwire the controller which is a pretty simple process. Along with the # 39523 brake controller, you'll also need the # ETBC7 brake controller installation kit. If you don't already have a 4-pole trailer connector to tap into the lighting circuits, you'll also need a T-connector, part # 118315. The install kit includes all the wire, circuit breakers and hardware...
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  • Recommended Equipment Needed to Add a 7-Way and Brake Controller to a 1994 Chevy Silverado 1500
    We have exactly what you need to install on your 1994 Chevrolet Silverado 1500 to activate your trailer lights and use a brake controller for the trailer brakes. Although the ModuLite on wiring harnesses can be very helpful, it isn't really necessary on vehicles that were built with towing in mind. The only time you really need to use a harness with a ModuLite is when you are installing it on a car. For your Silverado I recommend installing the Tekonsha T-One # 118315 which will install...
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  • Parts Needed To Install a Trailer Brake Controller On a 2000 Chevrolet 3500HD Cab and Chassis
    Yes, you can add a trailer brake controller to your 2000 Chevrolet 3500HD cab and chassis as it does not any pre-wiring from the factory. The Universal Installation Kit for Trailer Brake Controller # ETBC7 will provide you with the wiring needed to install a trailer brake controller. I was able to find a installation video of this with a Tekonsha Prodigy P3 Trailer Brake Controller # 90195 being installed on a 1997 Chevrolet Flat bed that will be similar to your cab and chassis. The T-One...
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  • How To Install The Tekonsha Prodigy P2 Brake Controller # 90885 On A 1997 GMC 2500 2WD Truck
    To install the Tekonsha Prodigy P2 Brake Controller, part # 90885, on your 1997 GMC 2500 2WD truck, some models do have the brake (blue) and hot lead (orange or red) wires already ran from under the hood to the end of the driver's side frame rail. However, these wires are hard to access and additional wire will still be needed. The easiest way to install the Prodigy brake controller on your 1997 GMC 2500 truck is to use the Tow Ready T-One Wiring Harness, part # 118315, and the Brake...
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  • How to Install an Electric Brake Controller Unit on a 1998 Chevrolet Pickup
    For your 1998 Chevrolet Pickup, there is no brake controller connector on the vehicle so the wiring for the brake controller will have to be hard wired on the vehicle. You will need just a few items to install a brake controller on your pickup. The items you need are a Working 4-Way connector, item # 118315, if you do not already have one. A brake controller wiring installation kit, item # ETBC7, and a brake controller of your choice. I would recommend the Prodigy P2, item # 90885 for...
    view full answer...


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