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

Item # 118315
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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. Call 800-298-8924 to order Tekonsha custom fit vehicle wiring part number 118315 or order online at etrailer.com. Free expert support on all Tekonsha products. Guaranteed Lowest Price 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 (95)
  • Q & A (131)
  • Videos (4)
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  • Why etrailer?

Tekonsha Custom Fit Vehicle Wiring - 118315

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

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

Installation Details 118315 Installation instructions

This Product Fits The Following Vehicles



California residents: click here


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

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




Video Transcript for Trailer Wiring Harness Installation - 1994 C/K Series Pickup

Today on our 1994 Chevy Silverado, we'll be installing the Tow Ready T1 Vehicle Wiring Harness with 4-Pole Flat Connector. Part number 118315. Now to begin our install, we'll first go ahead and locate the manufacturer's 4-pole connection on the driver's side of the frame rail. This will be on the inside of the frame. It comes off the manufacturer's harness. Once we locate the connector, we'll go ahead and split the two ends. To do that, we'll pull back on the locking tab and then separate the two connectors.

Next, we can take our new T1 wiring harness that will plug directly into the manufacturer's wiring, plug in the two ends into the manufacturer's connection points. Then we'll take the white wire with a pre-attached ring terminal and secure it directly to the frame, creating the ground for our new 4-pole harness. To do that, we'll use the self-tabbing screw provided with the install kit and run it directly through the bottom of the frame. Now, with our ring terminal secured we can go ahead and take the 4-pole flat connector, run it over the hitch and towards the center of the vehicle and secure it to the chain hold down. Then we'll go ahead and use some zip ties to secure our excess wiring. Now, with the 4-pole connector installed and secured, we'll go ahead and cut off the excess from the zip ties to clean up our install look and we're ready to test our new 4-pole connector. To test it, we'll take our test light, put it on the white wire terminal, which will be the inaudible 00:01:44 terminal for our ground. Our next terminal will be our brown wire for our running light circuit.

Then the yellow wire terminal will be the left turn signal, left brake and the green wire will be the right turn signal, right braking. Now we know our 4-pole connector works. We're ready to hit the road. That is for the install of the Tow Ready T1 Vehicle Wiring Harness with 4-Pole Flat Connector. Part number 118315 on our 1994 Chevy Silverado. .


Customer Reviews

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

Average Customer Rating:  4.9 out of 5 stars   (95 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.

- 118315
by:
2006 Chevrolet Colorado

Yep thats what I ordered. 521165



- 118315
by:

I was impressed with the service and the delivery I would recommend the company to anyone looking for products of this type thank you for the fine service and product 672910



- 118315
by:
1998 Chevrolet C/K Series Pickup

Heavier built than basic plug and play 4 way harness. 10 min to install. 666468



- 118315
by:
2000 Chevrolet C/K Series Pickup

Easy assembly. No splicing required. Plug and play. 609481



- 118315
by:

I was also excited when I received the package and was anxious to put it on. It worked perfect. After searching for it at some of local merchants I tired looking for it on line and found it. Thank you 601076



- 118315
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 520059



- 118315
by:
2000 Chevrolet C/K Series Pickup

Was easy to install and works great on my 2000 chevy K3500. 506526



- 118315
by:
1994 GMC C/K Series Pickup

Quick shipping, great price, wiring fit perfectly and works great. What else could you ask for?? :) 502257


Comments
Not a single problem, working just as well as day one.
JOHN r - 04/29/2019

54610

- 118315
by:

This plugged right into my 1990 k1500 shortbed and works perfect. Looks very well made and I’ve had it on for a while and used it quite a lot. 463802



- 118315
by:
1997 Chevrolet Silverado

trailer wiring was high quality and worked well on my 1997 Silverado. 453226



- 118315
by:
1997 Chevrolet C/K Series Pickup

Took 2 seconds to install. 100% satisfied !!! 430213



- 118315
by:
Chevrolet Orlando

product worked great, only thing usps sent my package to orlando then sent it to new hampshire then finally delivered it yesterday, guess priority mail left out the priority, anyway thanks 417596



- 118315
by:
1990 Chevrolet C/K Series Pickup

Great product works exactly like it sho uld 417173



- 118315
by:
GMC

I bought a wiring harness for my 97 gmc truck. It was easy to install and has been working great for me for a year now. Would highly recommend it for anyone looking for a easy great working product. 398786



- 118315
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. 358501


Comments
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.
Michael S - 03/26/2018

36459

- 118315
by:

It was what needed , plug in play no cutting/ soldering. Well worth MONEY! Easy-to- install @level beganer THANKS EVERYONE AT @ETRAILER 356923



- 118315
by:
1996 GMC C/K Series Pickup

Plugs right into factory GM plug 352639



- 118315
by:
1995 Chevrolet C/K Series Pickup

Good quality,good price. Perfect fit 355310



- 118315
by:
1998 Chevrolet Silverado 2500

This pig tell hook right up to my 98 GMC 2500 truck and works well great product. 346546



- 118315
by:
1993 Chevrolet C/K Series Pickup

great product high quality, still in excellent shape 344582


Comments
Great!! No issues at all
Dan - 02/23/2018

35062

- 118315
by:

Plugged into existing wiring and worked perfectly 341271


Comments
Worked great
Charley - 02/13/2018

34695

- 118315
by:

Wiring harness works great! 338826



- 118315
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. 334895



- 118315
by:

Great price, great shipping. Simple in stall. 332790



- 118315
by:
1990 GMC Odyssey

Quick delivery, good price, good product, good installation video--an all-around good experience. Installation on my 90 gmc shortbed took ten minutes, and I took my time. 331840


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Show More Reviews

Ask the Experts about this Tekonsha Custom Fit Vehicle Wiring

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    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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  • 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 Wiring For A 1998 Chevy C/K Series Truck
    For your 1998 Chevrolet C/K-Series 1500, I recommend the T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector, # 118315. This harness plugs directly into existing wiring with no splicing to cutting required. This will give you a 4-way connector. If you want to add a 7 way trailer connection, then I recommend the Universal Installation Kit for Trailer Brake Controller - 7-Way RV and 4-Way Flat - 10 Gauge Wires, # ETBC7. This will give you all the connectors, circuit breakers,...
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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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    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...
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    We do have what you need to install a fully functional 7-Way connector on your 1995 GMC Sierra, however there is not a plug and play 7-Way option similar to the 4-Way Harness # 118315 available for your truck. If you do not yet have a connector installed on the Sierra, you will actually want to start with the mentioned Tekonsha T-One Harness # 118315. This will plug into a factory port under the truck on the driver side. Once installed, I recommend using the Universal Wiring Kit # ETBC7...
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    The 2000 Chevy C/K Series does not have a plug in the relay box or under the dash to plug a brake controller adapter into. To wire in a brake controller like part # 90195 it would be a hardwired application. To accomplish wiring in the brake controller, you will need a 4-Way to 7-way kit part # ETBC7. Some of the C/K series trucks have OEM wiring extended to the back of the truck already but not all trucks are equipped with the partial wiring. To find the partial wiring (if you have it)...
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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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    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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    To add a brake controller to your truck and swap out the connector with a 7 way you'll need a few parts. You'll need a working 4 pole flat trailer connector (which you said is currently on the truck), the Universal Installation Kit for Trailer Brake Controller # ETBC7 and a brake controller. The ETBC7 kit comes with all the connectors, breakers, and wires to get a brake controller installed and a 7 way at the back of your truck. The 4 pole wiring will plug into the ETBC7 and then wires...
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    The Curt Trailer Hitch Receiver # C13042 that you referenced is a confirmed fit for your 1998 Chevy 1500. If looks like when you selected your vehicle you chose "1998 Chevrolet C-Series Medium Duty" instead of the "1998 Chevrolet C/K Series Pickup" catagory that your 1500 falls under. If you will be using this trailer hitch to tow lighter trailers that don't utilize brakes then you will also want to install the Tekonsha T-One # 118315 to activate the basic trailer lighting functions....
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  • Brake Controller Install on 1997 Chevrolet Pickup
    This is a fairly straightforward install. GM has already run some of the necessary wiring from the rear frame rail area to the engine compartment, so you will see a blue wire for the electric brake function, and an orange wire which provides 12 volt power for trailer accessories like a breakaway kit near the end of the driver side frame rail. The orange and blue wires at the rear of the truck would attach to the appropriate poles on the 7-way trailer connector on the rear bumper. You can...
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  • How to Install a Trailer Brake Controller on a 1998 GMC C/K Series Truck
    From what I know there are no tow package wires under the dash in the 1998 model year GM trucks. The under dash wire harness started in 2007. And from 1999 to 2006 there was a port under the dash. But for 1998 a brake controller has to be hardwired in. If the truck does not have a trailer connector you will need to first add a 4-Way using # 118315 or # 118312 for a deep drop bumper. If it already has a 4-Way or using the one just installed you would then need a 4 and 7 Way installation...
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Info for this part was:

Test Fit:
Joe V
Test Fit:
Nicholas E
Expert Research:
Mike L
Expert Research:
Michael H
Expert Research:
Jeffrey L
Video by:
Andrew K
Updated by:
Laura H
Updated by:
Sarah W
Updated by:
Alexander C
Updated by:
Isabelle B
Installed by:
Cole B
Video Edited:
Chris R

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