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4-Pole Hardwire Kit with Circuit Tester

4-Pole Hardwire Kit with Circuit Tester

Item # 18252
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Trailer Wiring

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Tekonsha Trailer Connectors - 18252
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Hardwire 4-pole trailer connector kit for vehicles with combined wiring - where the turn and brake signals are sent along the same wire. Quick-splice connectors and circuit tester included. Lowest Prices for the best trailer wiring from Tekonsha. 4-Pole Hardwire Kit with Circuit Tester part number 18252 can be ordered online at or call 1-800-496-5010 for expert service.
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Tekonsha Trailer Wiring - 18252

  • Trailer Connectors
  • Vehicle End Connector
  • 4 Flat
  • Plug and Lead
  • 6 - 10 Feet Long
  • Tekonsha

Hardwire 4-pole trailer connector kit for vehicles with combined wiring - where the turn and brake signals are sent along the same wire. Quick-splice connectors and circuit tester included.


  • 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
  • Tail light, stop and turn functions printed on wires
  • Ground wire runs full length of assembly
  • 18-Gauge bonded wires
  • Includes circuit tester and 4 quick-splice connectors


  • Harness measures 72" long
  • Maximum amperage:
    • Stop/turn lights: 7.5 amps per circuit
    • Tail lights: 7.5 amps per circuit
  • Limited 1-year warranty

18252 4-Pole Hardwire Kit with Circuit Tester

20252 Alternate

Installation Details 18252 Installation instructions

This Product Fits The Following Vehicles

California residents: click here

Video of 4-Pole Hardwire Kit with Circuit Tester

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

Video Transcript for Review of Tekonsha Wiring - Trailer Connectors - 18252

Today we're going to take a look at the 4-Way Hardwire Kit with the Circuit Tester. Now, this kit will allow you to install a 4-way flat trailer connector at the back of your vehicle to power your trailer's signal lights. It does connect very quickly and easily using the self-stripping, waterproof quick connectors. It does include the circuit tester, and that's for testing the functions on your vehicle.The wiring harness here has the four different wires. Actually, what'll help is, on the wire itself real small, if you look, it will tell you what that function's for. It'll have the tail lights, stop and turn, and ground functions printed on the wires.

But you do want to make sure that when you go to install this onto your vehicle, use your circuit tester, because you don't always want to match color to color. You want to test the function of the wire on your vehicle and match it to the function of the wire on the harness.The ground wire, the white wire on this, will go the full length of the harness. The wires on these are all 18-gauge bonded wires. The harness itself is 72 inches long. Again, it comes with the harness, the circuit tester, and then the four quick-splice connectors.The maximum amperage for this is: stop and turn light circuit, 7.5 amps per circuit; tail lights, 7.5 amps per circuit.

That should do it for the review on the 4-Way Hardwire Kit with Circuit Tester.

Customer Reviews

4-Pole Hardwire Kit with Circuit Tester - 18252

Average Customer Rating:  4.6 out of 5 stars   (184 Customer Reviews)

Hardwire 4-pole trailer connector kit for vehicles with combined wiring - where the turn and brake signals are sent along the same wire. Quick-splice connectors and circuit tester included.

2014 Smart fortwo

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

Just fine.
Vincent D - 05/31/2020


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.

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.


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.

I will have our customer service team reach out to you.
-- Etrailer Expert Jenny N - 11/16/2021


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


Thank you guys so much for making food on this order .. despite the fact that we had a bunch go sideways / misunderstandings and delays with this order . You all made good on each and every word spoken and every customer
Service person I felt with was knowledgeable and abreast of the order at every step .. it very pleasant to deal with a company that was organized and I did not have to recount the situation to each customer serves person who answered .. this product while I’ve yet to install it appears to be excellent quality and my Truck is excited !
Thank you again


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 !

We have a link to the installation instructions as well as some install videos on the product description page.
-- Etrailer Expert Mike L - 03/15/2019


Perfect for my 69 C10


I called Etrailer about a wiring issue on our Jeep. The representative was very knowledgeable, recommended a part to fix the problem and it came in just a few days. I put it in as recommended and all is good!

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.

On the product page, we have a link to the instructions as well as a couple of install videos.
-- Etrailer Expert Mike L - 12/17/2018


usless, out dated .maybe for a car in t he70s

1970 Ford F-100, F-150, F-250, F-350

I like the product. I found it odd that the package did not include directions. I was able to print them from Etrailer website. Minus one star because the direction should of been included.


Worked great. Simple instructions. Will buy from etrailer again.


All the wiring and pig tails were in good order


Item arrived on time and in good condit ion.

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.

1995 Chevrolet Camaro

Easy to wire in with the etrailer video. Good quality wires and connector.


The instructions for this product didn’t match the vehicle I had. When I called to asked questions I waited for 45 min and hung up. I figure out how to make it work but, what have been nice to have instruction that matched my vehicle.


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.


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.

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.

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!
Russell - 04/04/2018


Wired up very easily and the wire colors even matched what was in my Ford E350 van. I saved the test light and have used it for a bunch of other projects.

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.


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.

Show More Reviews

See what our Experts say about this Tekonsha Trailer Wiring

  • 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...
  • Brake and Turn Lights Not Working when Trailer is Plugged into the 4-Way on a 2009 Saturn Sky
    I would not recommend to replace any of the relays on the 2009 Saturn Sky. If you are having a wiring problem and the relay is activating, it is doing that to protect your vehicles wiring system. You do not want to change the relay and allow more current to get to your wiring system, which could cause major damage. The relay is doing what it was designed for. It sounds like it is a ground issue with the wiring on your vehicle. You will want to make sure that the white (ground) wire is...
    view full answer...
  • 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...
  • 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...
  • 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...
  • Trailer Wiring Harness Fit for a 1981 Chevy El Camino
    The # 18252 would work for your 1981 Chevy El Camino, you would need to splice the harness into the existing wiring behind the tail light assemblies. I will link you to an install video that will walk you through the process. The video shows an install on a different vehicle, but the process would be very similar on your El Camino.
    view full answer...
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  • Draw-Tite Wiring Recommendation for a 1996 Chevy Blazer
    If the six wires you found coming off of your 1996 Chevy Blazer are for trailer wiring you could certainly use 4 of them to wire up this 4-Pole Hardwire Kit Including Circuit Tester # 18252. The colors should match up color for color from your wiring to the # 18252. You will want to use the included circuit tester to make sure you wire it up correctly. On part # 18252 connect the White wire to a clean metal surface for ground, Brown to the running light circuit, Yellow to left turn and...
    view full answer...
  • 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...
    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.
    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...
  • Testing Tail Light Wires on a 2007 Chevy Monte Carlo to Install a Trailer Wiring Harness
    You have to test the tail light wires on your 2007 Chevy Monte Carlo to determine their functions and then splice them to the trailer wiring harness # 18252 accordingly. There is no standard wiring color code and we have not installed this harness on a 2007 Monte Carlo yet so testing is required. That is why it comes with a little circuit tester. You can follow the procedure in the video I have linked. Please note that the wire colors on your vehicle could be completely different. Once...
    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.
    view full answer...
  • 4-Pole Wiring Harness for 1987 El Camino
    The only trailer wiring that has been confirmed to work with your 1987 Chevrolet El Camino, is a hardwire connector kit like the Draw-Tite 4-Pole Hardwire Kit, # 18252. We do not have a plug in style that has been confirmed to work with your vehicle. Although the connector for another vehicle may look very similar, it has not been tested for use on the El Camino so there would be no guarantee that a it would work for you.
    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.
    view full answer...
  • Trailer Wiring Recommendation for 2014 Ford F-150 without Factory Wiring
    If your 2014 Ford F-150 does not have any trailer wiring at all the only options for adding a 4-way would be a hardwire kit like the part # 18252 which would splice in by using the included quick splices to connect to the correct circuits.
    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
    view full answer...
  • 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...
  • 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...
  • 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.
    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.
    view full answer...
  • Trailer Wiring Harness for a 1983 Dodge D150 Pickup
    For your 1983 Dodge D150 pickup you will need to use a hardwire harness, # 18252, because there aren't any T-connectors that are confirmed to fit. The good news is the hardwire harness costs less and is not all that difficult to install at all. I have linked a video showing the process of testing the vehicle wires and installing the harness.
    view full answer...
  • 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...
    view full answer...
  • 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...
  • Solution for Trailer Wiring Harness on a 2008 Ford F-150 With Dead CIRCUIT at Fuse Slots
    If there isn't power to either side of the fuse slots on your truck when the blinker is on that is not a great sign. That would indicate a much larger problem upstream of the fuse box. To save yourself the headache, you might just bypass the factory 4-way by installing a part # 18252 which would just hardwire to your truck's wiring.
    view full answer...

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