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  1. Custom Fit Vehicle Wiring
  2. Tekonsha
  3. Universal Fit
  4. Trailer Hitch Wiring
  5. 4 Flat
  6. No Converter
4-Way Flat Trailer Connector w/ 72" Harness, Circuit Tester and Wire Taps

4-Way Flat Trailer Connector w/ 72" Harness, Circuit Tester and Wire Taps

Item # 18252
Our Price: $27.17
Custom Fit Vehicle Wiring

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This universal, splice-in wiring kit includes a 4-way flat connector, circuit tester, 72" of bonded wire, and 4 wire tap connectors. Color-coded, bonded wires have functions printed on them to make installation easier. 1-800-940-8924 to order Tekonsha custom fit vehicle wiring part number 18252 or order online at Free expert support on all Tekonsha products. Great prices and Fastest Shipping for 4-Way Flat Trailer Connector w/ 72" Harness, Circuit Tester and Wire Taps. Custom Fit Vehicle Wiring reviews from real customers.
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Tekonsha Custom Fit Vehicle Wiring - 18252

  • Universal Fit
  • Trailer Hitch Wiring
  • 4 Flat
  • No Converter
  • Tekonsha
  • 6 Feet Long

This universal, splice-in wiring kit includes a 4-way flat connector, circuit tester, 72" of bonded wire, and 4 wire tap connectors. Color-coded, bonded wires have functions printed on them to make installation easier.


  • 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)
  • Works with 2-wire electrical systems
  • Splices into your vehicle's wiring with the included quick-splice connectors
    • Bonded wires are color coded (see wiring configuration below) and labeled
    • Included circuit tester helps ensure wiring is correct during installation
  • Includes durable, molded-rubber, standard female output socket


  • Harness length: 72"
  • Max amperage: 7.5 amps per circuit
  • Wire gauge: 18
  • Limited 1-year warranty

4-Way Trailer Connector Installation

Because the color/function of the wires on this connector may not match the color/function of those on your vehicle, be sure to use the included tester to double check the function of each wire on your vehicle's tail light wiring harness before installing this connector. Once you've figured out the functions of your vehicle's wiring, use the included quick-splice connectors to connect the corresponding wires on the trailer connector. Quick-splices, or "wire taps," offer a quick way to make connections without you having to strip and twist wires. Just place the wires in it and snap the cover down.

The number 1 reason trailer wiring comes up faulty is a bad ground, so make sure your ground wire has a solid and clean connection to metal. To make this connection, you'll need a self-tapping screw and a ring terminal (sold separately).

Wiring Configuration

Wire Color Wire Function
Green Right turn and brake light
Brown Tail lights and running lights
White Ground
Yellow Left turn and brake light

Quick Tips:

We install a lot of wiring harness around here, so we thought we'd share a few tips we've picked up over the years:

  • Butt connectors - especially heat-shrink ones - provide the most secure, longest-lasting connection, so we'd recommend you grab a few and swap them out for the quick-splices in this kit.
  • Use a circuit tester on the plug terminals once the harness is installed to make sure everything's working. There's nothing worse than figuring out that you have a bad ground or a faulty connection right before you're about to hit the road.
  • Be sure to put a little bit of dielectric grease on the 4-way plug to protect the terminals from dirt, grime, and corrosion.

18252 Tekonsha Vehicle Wiring Harness with Vehicle End 4-Pole Connector Kit and Circuit Tester - 6' Long

20252 Alternate

Installation Details 18252 Installation instructions

This Product Fits The Following Vehicles

California residents: click here

Customer Satisfaction Score:

Customer Reviews

4-Way Flat Trailer Connector w/ 72" Harness, Circuit Tester and Wire Taps - 18252

Average Customer Rating:  4.6 out of 5 stars   (209 Customer Reviews)

This universal, splice-in wiring kit includes a 4-way flat connector, circuit tester, 72" of bonded wire, and 4 wire tap connectors. Color-coded, bonded wires have functions printed on them to make installation easier.

2014 Smart fortwo

Thanks to the video I did not have a problem installing the trailer wiring on my 2014 Smart Fortwo.

Vincent S.


Just fine.


Worked great for 6 mo. Ish. I’ve had the right side wire become loose/break so occasionally the right side will randomly choose to quit working but (at least for me) that’s not a huge deal with how little I use my trailer. solid purchase overall.

Etrailer Expert

Katrina B.


I have contacted the manufacturer and the have suggested that the wiring harness should be checked for a good connection, it sounds like the harness may not be connected correctly.

Chevrolet Corvette

This harness worked great for my Corvet te.


Awesome product never any issues use along easy install practically don’t need instructions


First thing I noticed were the online videos that can be saved to a file. nice! also noticed the instructions for assembly of the tow bar was small and difficult to read, (my mechanic was crying throughout the installation) There were no instructions on the wiring kit installation, even a photo of the wire to wire color placement would have helped, but my mechanic went on line and got the photo from an outside source - thus the 4 stars, not five. - other than that it worked out very well, the products are solid, well made, and superbly engineered. everything was inside! thanks !

Etrailer Expert

Mike L.


We have a link to the installation instructions as well as some install videos on the product description page.


Each trailer is the best. Very easy to order from. Also, Sherry was very helpful and friendly.

1990 Dodge Van

Took me almost a year to actually get to installing this on the van, but wanting to use the trailer was a strong motivator. Its just a basic wiring set with quick connect clips in a bag. The fact that I was installing this on an extended camper version of the van this was designed for complicated the install, but "fortunately" there were enough rust holes that I could drill where I need to drill. Wires were long enough for the job (exactly the length needed) and the clips came pre-filled with silicone grease. Nice. Came with no instructions, but the on-line installation video is *excellent* and guided me thru the entire process. Overall, it was a convenient way to buy and install a wiring harness on my older van. Only two minor complaints:
* Did NOT include a weather-proof cap for the plug, which hangs outside by the hitch. I took the one included with the wiring kit for my Suburu (from etrailer) since that plug is stored inside the vehicle.
* The 12v circuit tester did NOT work. Fortunately I had my own tester.

1992 Dodge Van

Over all good experience
Missed the bolt
package in my delivery but it was sent out right away... Friendly customer service... Hitch went on without a hitch. Great product..I will use this company again.. Thank you

2007 Ford Focus

This was a pain in the rear end. Wires were not labeled and the tester was useless. Had to go to online for some instructions (none included with kit). Took a long time to get it wired to the car.

Etrailer Expert

Mike L.


On the product page, we have a link to the instructions as well as a couple of install videos.

1984 Jeep CJ-7

I got a 4-wire harness to connect my jeep to a utility trailer. The harness worked perfectly.
The connectors were good--surprisingly, they were stuffed with noncorroding gel so that the jeep's wires are protected. There were no specific instructions for the hookup, but simply removing the taillight lenses showed which color wires to splice.
The supplied tester failed to function, but that wasn't a problem at all--I didn't really wish to poke additional holes into the wires anyway.
Took a half hour to complete.

2006 Ford Focus

The installation documentation, along with the video aid, was very helpful and easy to understand. It helped a lot, and made the installation fast and easy. I like it a lot, and I appreciate the support I got on a minor issue which was easily and quickly taken care of.



The products I purchased work beautifully! I haven’t experienced a single issue with anything.You guys are terrific!


Their customer service is amazing and within a few day my order was here.

1998 Chevrolet Blazer

Only thing that needed to be changed was wire connectors. Type included with the plug are easy to install (no insulation stripping, just clamp) but are not reliable. Throw those away and use standard crimp butt splices. Plenty of wire included, so I cut to more convenient length, spliced, and taped 8 inches on both side of splice. Tester is a nice touch, save in your tool box after installation.


Product as described and very easy to install. In my case it didn't work, because the original wiring on my truck apparently is bad and I couldn't figure out what was faulty, so I ended up getting another harness that plugs into existing tail light harness, which worked great.

2005 Ford Focus

I installed this wiring kit along with a hitch. This was pretty easy to install, and the directions were easy to follow. The hardest part was pulling up the the liner in the hatch back area to get to the wires.

2001 GMC Sierra

Has held up great over a year so far. I recommend wrapping the wiring in electrical conduet to help make the set up last even longer like I have





I needed a hitch and wiring harness to pull a small trailer for hauling lumber. The harness was easy to install and has worked without any problems over the past year.

2013 Ford Edge

Worked perfect. I used it to extend the pigtail on my tow dolly. etrailer has great shipping & service. Have bought from them many times.


The box of contents I received was partially damaged and the boxes inside not properly secured and wrapped and damaged inside.There was a hole in the box and am missing one elecrical connector. Everything else was O.K.

Etrailer Expert

Jenny N.


I will have our customer service team reach out to you.


Product arrived early. Product was packed very well. Product installed EXACTLY as the installation video decsribed. I'm very happy with my decision to do business with this company.


I don’t know if I got all the parts as they where lose in box with brown paper to hold. After trips to the local hardware store & your excellent video, I was able to install. Have not hooked up to trailer yet, but all tested out good per instructions.
More after hook up to trailer & field test.


Your product was easy to install and works fine. However, one thing that I think would be a good idea, would be to include a set of installation instructions with the product. I didn't know that the metal tabs on the connectors had to be pushed all the way down before snapping the plastic hinge over the top of the tab. A friend of mine informed me of that.

2010 Ford F-150

The product is of good quality. The only issue is that the pins are to short and it is difficult to connect to the OEM connector on my trailer's connector.


I purchased the Draw-Tite Receiver and wiring kit. All parts were easily identified. Good printed instructions. Everything assembled easily and fit perfectly. It took about 1.5 hrs to complete. It will be used to tow a small utility trailer. Highly recommend this equipment and Thanks.


4-pole Hardwire Kit with circuit tester.

needed the kit to attach rear (break/lights/back-up/tail lights) assembly.

Show More Reviews

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

  • Installing a 4-Pole Wiring Harness on a 2002 Chevrolet Astro
    The Draw-Tite Wiring Harness, # 18252, will work on your 2002 Chevrolet Astro. This wiring harness will splice into your vehicles tail light assembly wires. You will need to locate the tail light wires on your vehicle and test the wires using the circuit tester that is included. The wires will need to be matched by function. The brown wire on the wire harness is for the tail lights, the green wire is for the right turn and brake lights, the yellow wire is for the left turn and brake lights...
    view full answer...
  • Should the Wire Just Before the Braking Assemblies Receive 12 Volts
    It is normal for the brake output wire to lose voltage as it travels from the brake controller to each braking assembly. The amount of drop should only be around 1-2 volts so if it is more than this then there is an interruption in the wire that would need to be either repaired or replaced. You can use your multimeter to find where the loss (if any) occurs. With that being said, if the brake controller is not at the max settings and you are not using the manual override then it would not...
    view full answer...
  • 4-Way Replacement Recommendation to Replace a Thick 4-Way on a 2013 Ford Edge
    I think the easiest solution would be for you to cut the 4-way off of your 2013 Ford Edge and then wire up a new 4-way to the wires. You could use the 4-Pole part # 18252 you referenced for this and you would be able to connect to your trailer without a problem.
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  • Troubleshooting Brake Controller that Only Shows a Few Volts When Tested with Brake Pedal
    If you have a proportional brake controller you won't get full voltage when using the brake pedal and testing the pin since the controller needs to see sense deceleration before really applying voltage. If you have a proportional brake controller like it sounds like you do this would be what's going on. A lot of proportional controllers will put out a very small voltage spike when they sense that the pedal is applied which explains why you saw a small amount.
    view full answer...
  • 4-Way Trailer Wiring Connector Recommendation for 2001 Ford F-250
    For your 2001 Ford F-250 we have trailer wiring harnesses that are confirmed fits but they are universal, hardwire style. The part # 18252 is what's recommended and it splices into the wiring of your taillights to provide you with a 4-way. In the meantime I attached a help article down below that covers troubleshooting trailer wiring issues for you to check out as well.
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  • Brake Controller Show Full Voltage with Manual Override But Half with Brake Pedal
    Many proportional brake controllers require that the vehicle be moving to send back the full voltage when stepping on the brake pedal. Depending on the brake controller you have this could be what is going on. You may also need to adjust the output settings. The manual override will send back the full amount of voltage (up to what it is set at) but it may not do so with the brake pedal depending on the controller and its settings. I have included a couple of links on testing and troubleshooting...
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  • Installing Trailer Wiring on a 1959 Chevy Truck
    The 4-Pole Hardwire Kit, # 18252, is a general hardwire harness. You will use the included circuit tester to probe the wires behind the tail lights. On the driver side, you will attach the yellow wire on the harness to the tail light wire that carries the left turn signal and brake lights. The brown wire will attach on the driver side to the tail light wire that carries the running light signal. The white wire is ground and will attach to the vehicle frame. The green wire will get routed...
    view full answer...
  • How To Install 4-Pole Hardwire Kit 18252
    The 18252 hardwire kit needs to be cut and spliced to your vehicle taillight assembly wires. I have included a link to a video of a hardwire install on a 2000 Dodge Neon. There are plug and play type wiring harness that are easier to install for some vehicles. I would be happy to confirm what the best wiring option is for your vehicle, if you write back with your vehicle year, make and model.
    view full answer...
  • 4-Way Trailer Wiring Harness Recommendation to Add 4-Way to Rear of 5th Wheel for Second Trailer
    What you would need is the part # 18252. This is a 72 inch long 4-way connector that comes with quick-disconnects so that it can easily be attached to a trailer's taillight circuits. It would be just a matter of tapping all of the correct circuits for the wiring.
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  • Can 1992 Buick Century Tow a Trailer
    I could not find an online owner's manual for a 1992 Buick Century but I was able to find one for a 1993 model year and on page 176 it states that the '93 CAN tow a trailer. I attached that page from the 1993 owner's manual. Capacity is up to 1000-lbs, or up to 2000-lbs if the car has a V6 engine with a four speed automatic transaxle and is equipped with the optional heavy-duty engine cooling system. Both model years are within the same generation of the car so chances are they could share...
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    Image 1 for
  • Trailer Lights Go Out When I Apply Brakes on Tow Vehicle 2002 Toyota Tundra
    It sounds like there is a bad ground connection somewhere on the trailer because your lights are working when they are not put under a load. Whenever your tail lights are on and then you apply the brakes, the system is under max amp load, and with a bad ground the lights cannot support all the amps. I would start by checking the ground connections of the tail lights on the trailer to make sure there is a good connection to a clean metal surface. You will also want to inspect the wires to...
    view full answer...
  • Trailer Wiring Harness Fit for 1982 Chevrolet S-10 Pickup
    For your 1982 Chevrolet S-10 Pickup, you will need the Tekonsha 4-Pole Hardwire Kit with Circuit Tester, part # 18252. This hardwire kit will provide a 4-way flat trailer connector for your S-10. The T-One Wiring Harness # 118312 mentioned in your question is not longer available and is not compatible with the 1982 Chevrolet S-10. I have included a link to the instruction manual for the Hardwire Kit.
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  • Brake Pedal Only Gives 2.9 Volts on Brake Controller on a 2006 Dodge Ram 1500
    To diagnose this issue I would need to know which brake controller you have. If it has a level adjustment knob on the side and that adjustment is not just right it can affect how much voltage goes on when using the brake pedal. Similarly, if the controller is tilted or turned to one side or the other or otherwise mounted outside of the range specified in the instructions it can cause the controller not to function properly. If mounted and leveled correctly then the issue could be the connection...
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  • Should I Have 12 Volts At Each Braking Assembly on a Trailer
    What type of brake controller do you have? If you have a proportional brake controller then 12 volts will only be sent to the brakes if you apply the manual override with the settings all the way up. If you still only have 8.9 volts then you may have a short on the blue brake output wire in between the brake controller and braking assemblies or the brake controller is bad. In order to make sure there is not a short on the vehicle side you will need to test the 1 o'clock pin on the 7-way...
    view full answer...
  • Is there a Custom Fit Wiring Harness for a 2009 Smart ForTwo
    Currently there is not a direct plug in harness for the Smart Car. The correct wiring harness is the 4-Pole Hardwire Kit, item # 18252, which includes a circuit tester to find the correct circuits on the vehicle to connect the trailer wiring to.
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  • Installing Tekonsha 4-Pole Hardwire Kit on 2004 Chevy Blazer
    The installation process for the Tekonsha 4-Pole Hardwire Kit # 18252 on your 2004 Chevy Blazer should be similar to the one demonstrated in the video we have for the 1996 model, but I do still highly recommend testing the factory wires with the included circuit tester just to ensure the correct connections are made. We do not currently have an install video for the 2004 Blazer. There should be a factory wiring bundle located behind the bumper structure near the spare tire. Most likely...
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  • Troubleshooting Trailer Brake System That is Only Showing 5-Volts at Trailer Connector
    With the brake controller gain turned all the way up, you should be seeing closer to 12-volts at your trailer connector. You are losing voltage somewhere between the brake controller and the trailer connector. I am assuming that by electric brake contact, you are speaking of the brake voltage output pin on the trailer connector. Make sure your controller is properly installed and leveled according to the instructions. Use your tester on the blue brake output wire at the rear of the brake...
    view full answer...
  • Wiring Diagram and Instructions for 4-Pole Hardwire Kit with Circuit Tester
    I have the wiring diagram, videos and instructions for the 4-Pole Hardwire Kit with Circuit Tester # 18252, attached to this help page. White Wire = Ground Green Wire = Right Turn/Brake Brown Wire = Running Lights Yellow Wire = Left Turn/Brake
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  • Recommended 4-Way Trailer Connector Installation On 2013 Ford F-150
    If your F-150 has a 4-way connector it is typically located near the rear license plate. It can be tucked back up behind the bumper and may even be taped or zip tied to other wires or the frame of the truck. If there is no trailer connector, you will need to use the Draw-Tite 4-Pole Hardwire Kit, part # 18252, and locate the correct circuits behind the vehicle taillights for installation. The kit includes a circuit tester and the quick-splice connectors needed. I have attached a link...
    view full answer...
  • Parts Needed to Add 4-Way to Fifth Wheel Trailer for Towing Second Trailer
    What you would need is the part # 18252. This is a 72 inch long 4-way connector that comes with quick-connects so that it can easily be attached to a trailer's taillight circuits. It would be just a matter of tapping all of the correct circuits for the wiring. Adding the 4-way to the vehicle would be pretty difficult and would require quite a bit of wiring.
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  • Finding Connector for Install of Tekonsha Trailer Wiring Harness on 2022 Lexus RX 350 w Tow Package
    If you check out the attached install video you'll see exactly where to find the connector to install the Tekonsha 4-way kit part # 18252 on your 2022 Lexus RX 350. If you cannot find it that would indicate you most likely would not have the tow package.
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  • Trailer Running Light Pin on 2013 Ford F-150 Trailer Connector has No Power
    It could be a tow package fuse or relay that is causing the trailer running light circuit to fail on your 2013 Ford F-150. In the power distribution box the fuse that feeds the trailer park lamp relay is in position 6. Also check position 67. I am almost certain that it is a fuse/relay that needs to be replaced but if not then like you said this is an issue somewhere in the wiring that will need to be tracked down.
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  • Fuses To Check on 2006 Ford Expedition When Trailer Running Lights Don't Work
    A blown fuse under the hood of your 2006 Ford Expedition is indeed a common cause for the trailer running lights not to work. I pulled up the online version of the owner's manual for the Expedition and you will want to check the 20 amp mini fuse located in the number 10 position inside the passenger compartment fuse panel along with the R201 relay. These are both connected to the trailer running lights circuit for the vehicle's factory 4-Way connector. If replacing the fuse/relay does...
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  • Will Draw-Tite 4-Way Hardwire Kit # 18252 Fit a 2003 Chevy Cavalier
    The wiring system on your 2003 Chevrolet Cavalier is a 2-wire system, which means you do not need a wiring harness kit with a converter box. A converter box is only needed if your vehicle would have separate wires for the brake and turn signals. The Draw-Tite 4-Way Hardwire Kit, part # 18252, will work on your 2003 Chevrolet Cavalier. This is a standard 4-Way wiring kit that will tap into the tail light wires by function. It includes a circuit tester that will allow you to test the wires...
    view full answer...

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