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4-Way Flat Trailer Connector w/ 60" Harness and Wire Taps

4-Way Flat Trailer Connector w/ 60" Harness and Wire Taps

Item # 18002
Our Price: $12.22
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Trailer Wiring

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This universal splice-in wiring kit includes a 4-way flat connector, 60" bonded wire, and 4 wire tap connectors. Quickly and easily wire your vehicle to tow. Great Prices for the best trailer wiring from Tekonsha. 4-Way Flat Trailer Connector w/ 60" Harness and Wire Taps part number 18002 can be ordered online at or call 1-800-940-8924 for expert service.
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  • Reviews (44)
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Tekonsha Trailer Wiring - 18002

  • Trailer Connectors
  • Vehicle End Connector
  • 4 Flat
  • Plug and Lead
  • 0 - 5 Feet Long
  • Tekonsha

This universal splice-in wiring kit includes a 4-way flat connector, 60" bonded wire, and 4 wire tap connectors. Quickly and easily wire your vehicle to tow.


  • 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)
  • Ensures that your vehicle's wiring matches that of your trailer
    • Works with a 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)
  • Includes durable, rubber-molded, standard female output socket


  • Harness length: 60"
  • 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 new connector wires may not match the color/function of your vehicle wires, be sure to use a tester (sold separately) to determine the function of each wire on your vehicle's tail light wiring harness before installing this connector. Once you've determined the matching functions, use the included quick-splice connectors to connect the corresponding wires.

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 Tip:

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.

    118002 - Tekonsha Vehicle Wiring Harness with Vehicle End 4-Pole Connector and Wire Tap Connectors - 5' Long

    This Product Fits The Following Vehicles

    California residents: click here

    Customer Satisfaction Score:

    Customer Reviews

    4-Way Flat Trailer Connector w/ 60" Harness and Wire Taps - 18002

    Average Customer Rating:  4.9 out of 5 stars   (44 Customer Reviews)

    This universal splice-in wiring kit includes a 4-way flat connector, 60" bonded wire, and 4 wire tap connectors. Quickly and easily wire your vehicle to tow.


    Harness is well made and shipped quickly and packaged perfectly


    Took about 15 to 20 mins total to remove all the covers,Matt’s etc
    Wiring it in is so easy, only 4 wires,
    Use blue butt splice connectors instead of the ones it comes with.
    You can buy a small pack of ten for about 3 bucks, by doing this you will never have to worry about a loose connection.
    The video tells you what color goes where.
    I like to put a small price of electrical tape over every connector I do.
    Looks more professional and the wires can never come apart.



    It was an easy hook up:.still working good. No issues, I use it once a week or more.




    Hitch and install were simple and easy, as well as the wiring harnesses to the trailer.



    Hitch is all good, wish the wiring harnesses connection was a bit better built.

    2012 Lexus RX 350

    Purchased this plus 18144 mounting bracket for new installation on my 2007 Lexus RX350. Lexus SUV was advertised as having "towing prep package", a $160 option, installed but it wasn't clear if that package included the proper wiring connection under the floor for this product. After digging down (per your excellent video for this vehicle), I found everything as hoped for. Installation was less than 45 minutes including cargo area disassembly and reassembly. Mounted the mounting bracket on plastic surface under the bumper - drilling was easy and mounting appears to be secure. Finished off installation with 30512 flat cover LED tester. All in all a very clean installation. BTW, used 12 inch plastic ties to dress wires under the car so that nothing droops done. My wife is pleased - which goes a long way to confirming the aesthetics of the installation. Thanks for the great videos and products.

    2007 Lexus RX 350

    Trailer wire received was as expected however there is one part that could be better. The 4 box type 3M wire connectors that come with it are not the right connectors for this application. When connecting the 4 wires the box connectors are all on top of each other and create a large "bunch". The etrailer "how to video" shows the use of butt connectors which is a much better application. The "how to" instructor acknowledges the 3M connectors that come with the wires but simply says he is going to use butt connectors. So, why not include butt connectors in the simple wire kit? Otherwise all is well and trailer lights work fine, thanks etrailer for your good service.

    2009 Lexus RX 350

    I gave ETRAILER and the trailer hitch five stars. The product is of very high quality and the customer service received was awesome. Installed the heavy duty hitch in less than thirty minutes. It was a custom fit for my 2009 Lexus 350RX. The wiring harness for less than $10 was a perfect match since my Lexus was equipped with a towing package. Shipping was SUPER FAST AND FREE!!!

    2007 Lexus RX 350

    Perfect Video directions. My friends were amazed watching the video before I installed the wiring in my 2007 Lexus RX 350 AWD.
    Great Company. I will always order all my hitches and wiring accessories from etrailer.


    Works well


    the harness was exactly the way it was pictured. the instructional video on the website helped tremendously with installation. no problems at all.

    Mike K.


    One year later and the harness has given me no problems at all. I highly recommend ETrailer for towing accessories.

    2009 Lexus RX 350

    Just finished installing hitch and wiring on my Lexus rx350. Everything went in perfectly and the video was a great help on the trailer wiring. Even showed how to disassemble interior panels to reach loom


    I ordered a more expensive harness initially. I then found that my Lexus was prewired for a harness and needed only this one. Only bummer was I had to pay $11 to ship the other one back and this one did not qualify for free shipping. So my mistake cost me an extra $15.

    2000 GMC Jimmy

    This was a quick and simple install on my 2000 GMC Jimmy. Purchase the Mounting Bracket 4-Pole Flat with this and you have a very professional looking installation without having wires hanging under your vehicle.


    Used this part in assembling my trailer wiring with brake controller. Everything works well!


    Got the wiring harness to make an extension to pull our trailer behind our camper with bikes and kayaks in. This worked great! I love etrailer!


    Installed it this weekend. Easy as eating pie. You-tube video made it brainless. Product was fine. Connectors seemed solid. Length of cable is sufficient, but could be longer.

    2007 Lexus RX 350

    Easy to install and the video was so helpful! Made it quick and painless.

    2009 Lexus RX 350

    Works great on my 2009 Lexus RX 350 that was pre-wired at the factory. The part was easy to order online and the customer service representatives were friendly.

    2004 Saturn Vue

    It is very good product. Instructions on the internet was very usefull.

    2007 Lexus RX 350

    Worked as advertised and extremely easy to install. Less than 25 minutes from start to finish. Very satisfied with the quick shipment from ETrailer.


    This trailer wiring matched up exact with the auto wiring. I was able to install in very short time.

    Howard E.



    2009 Lexus RX 350

    Great Product, Fast Shipping, Quick 20min Install on my '09 Lexus RX350!


    Worked great. The length was perfect, but none to spare.

    Joe G.


    Everything works fine.

    Lexus RX 350

    The product is top notch. The how to videos make installation very easy. I had the hitch installed in a half hour, by myself. The wiring was easy because my rx350 Lexus already had a towing port at the rear of vehicle.


    Very quick delivery! I was also kept well-informed during the shipping and delivery process. The product is great and the videos were a great help. Great service. Thank you!

    Show More Reviews

    See what our Experts say about this Tekonsha Trailer Wiring

    • Trailer Lights Not Working When Connected to a 20014 Ford F-150
      On a vehicle side trailer connector the brake lights and turn signals are on the same circuits (one each for the left and the right) because that is what the trailer uses. So it is not unusual that the tester you are using showed power on the turn signal indicators when the brake pedal was pressed on your 2004 Ford F-150. They should also come on when the turn signals are used. Assuming that all the functions work on the truck side, the problem must be on the trailer side. It could be...
      view full answer...
    • Possible Ways Brown Wire of Trailer Wiring is Ran
      I found the answer page you are referring to where I said: The brown/green and brown/yellow wires on your trailer are for the same running light circuit. You would need to run them both to the brown wire of the 4-way. This particular trailer wiring setup had the brown wire (running light circuit) split off in to two wires for both sides of the trailer and they were marked yellow/brown for the left side and green/brown for the right side. Sounds like your trailer is wired more traditionally...
      view full answer...
      Image 1 for
    • Troubleshooting Open Running Lights Circuit
      Sounds like the problem lies either with the trailer connector on the trailer, or in the trailer wiring itself. A loose connection or insufficient ground connection is the most likely culprit. First, check the connector on the trailer, look for any corrosion or damage that would prevent the signal from the running light circuit from getting through to the trailer. Then, make sure the white ground wire from the trailer connector is securely connected to a clean, non corroded spot on the...
      view full answer...
    • Troubleshooting Running Lights Not Working On Trailer When Hooked To 2012 Chevrolet Silverado
      Since you said the problem exists for two different trailers, the problem will be found in the truck wiring. You said you checked all of the fuses and they are okay and then you said you used a circuit tester and found the running light circuit is not working. There should be a large fuse box on the driver side under the hood and on the fuse legend the fuse you can check out is titled 'Trailer Park'. This is a 15 amp fuse and can be the source of the problem. If you find the fuse is blown,...
      view full answer...
    • Running Lights on 2 Trailers Not Working with a 2005 Dodge Ram 1500
      When you checked the fuse on the truck did you check the truck's running light fuse or the tow package running light fuse? They are independent of each other on most vehicles. There also could be relays associated with the tow package wiring that you can check. A good start was to clean the trailer connector but if there is no power on the running light circuit then the issue is further forward somewhere on the truck. And if it is not a fuse or relay then it is likely a damaged wire somewhere...
      view full answer...
    • Troubleshooting No Trailer Running Lights and No Power at 7-way on Rear of 2008 Chevrolet Silverado
      It sounds to me like the fuse for your trailer's running lights has blown. The 11:00 pin when looking into your 7-way is for the trailer's running lights. The 1:00 position is for 12 volt power. I found an online copy of an owner's manual for a 2008 Chevrolet Silverado and it shows the correct fuse in location 25. You might verify with your manual but I'd start there. If you find a blown fuse the next step is to determine why it blew. Make sure the 7-way on both your truck and trailer...
      view full answer...
    • No Taillights or Brake Lights on Rear of Camper
      The first step to troubleshooting your trailer lights would be to ensure the correct signals are being sent from the vehicle which you can do by checking the trailer connector on the vehicle with a test light. If you have issues here then it's usually just a fuse so be sure to check your vehicle's owner's manual so you can identify the correct fuse locations. If the vehicle side trailer connector test out then you'll need to start tracing the wires from the trailer side trailer connector...
      view full answer...
    • Trailer Left and Right Side Tail Lights Work Intermittently
      This sounds like a ground issue. Ground problems normally show up when there is more draw on a system such as when you have the running lights on and then use another function like a turn signal or brake light. Make sure that the vehicle side and trailer side connectors are clean and free of corrosion inside and out. The main connector grounds should be attached to clean and corrosion free bare metal surfaces. The light grounds should also be attached to clean and corrosion free bare...
      view full answer...
    • Turn Signals on Boat Trailer Work, But Brake Lights Do Not
      When you state that you never had to use a converter before, do you mean with this particular vehicle? That the brake lights worked with this trailer being towed by this vehicle before, but are not working now? Or do you have a new car, and you have hooked up the trailer connector and are finding that the lights on your boat trailer are not working correctly? Most trailers use what we call a combined lighting system. This means that the brake lamp signal and turn indicator signal is combined...
      view full answer...
    • Attaching Ground Leads from Trailer Tail Light
      No Problem! Each ground wire would simply ground to the trailer frame. You can use a self tapping screw, and make sure that the area you are attaching the wire to is not corroded. What you are doing is using the trailer frame itself to carry the ground from the light fixture up to the grounding point on the trailer tongue.
      view full answer...
    • Troubleshooting Left Turn/Stop and Running Light Circuit of Trailer Wiring Not Working
      Have you tried cleaning all of the pins of the trailer wiring connectors with sandpaper? In almost every trailer wiring issue like what you described this takes care of the problem. I also attached a help article on trailer wiring troubleshooting for you to check out as well.
      view full answer...
    • Troubleshooting Trailer Lighting Brake Lights Not Functioning on 2008 Chevy Trailblazer
      Check the third brake light fuse of your 2008 Chevy Trailblazer. It sounds like that circuit is blown and because of that is not allowing your trailer brake lights to illuminate. This is a common problem for Chevy vehicles like yours.
      view full answer...
    • Troubleshooting Trailer Light Flashers with 2012 Hyundai Tucson
      It sounds like you might have a ground issue. A ground issue usually appears when there is a bigger draw is placed on the wiring. This could explain why the flashers work when the vehicle is off, but will not work when the vehicle is on. Check the white ground wire to make sure that the contact is secure and undamaged, free of dirt, and doesn't show signs of corrosion. Even if there aren't these visible signs, your ground may be in a bad location. Try moving the ground to a better location...
      view full answer...
    • Wiring Color Code for a 4 Pole Flat Vehicle Connector
      On a 4-Way flat connector like the 4-Pole 60 Inch Long Vehicle End, # 18002, that you have referenced, white is the ground wire. The brown wire is for the taillights/running lights. Yellow is for left turn signal and brakes. Green is for right turn signal and brakes. I have included a link below to our wiring FAQ page that shows and explains the functions of various trailer connectors, both vehicle and trailer ends.
      view full answer...
    • Trailer Turn Signals Not Working When Connected to 2001 Ford F-350 7-Way Trailer Connector
      There could potentially be a couple of issues going on at the same time. The first thing you are going to want to do is make sure all the functions works on the truck side with no trailers connected. Use your tester to test the connector while someone sits in the truck and runs through the lighting functions. If the truck side turn signals are not working then you will want to check the vehicle owners manual for the locations of the fuses and relays related to the tow package wiring. One...
      view full answer...
    • No Power to my Trailer Lights on my 1999 Chevrolet Express Van
      Yes the converter box or wiring harness like the 4-Pole 60" Long Vehicle End part # 18002 needs to be grounded to complete the circuit and provide ground between the source of power and the trailer.
      view full answer...
    • Troubleshooting the Installation of a Tow Ready Wiring Harness # 18002 on a Camper
      It sounds like the white wire is not being grounded. You will need to run that to a clean metal surface and then the 4-way should function correctly. I attached an installation video for this product for you to check out that shows how this product installs onto a vehicle for you to check out also.
      view full answer...
    • Can a 4-Pole Trailer Connector Be Used to Activate Trailer Brakes
      In order to actuate the trailer brakes, you'd need a brake controller installed in the vehicle and a 6 or 7-way trailer connector. A 4 pole flat wiring harness like the # 18002 you'd looked at carries 4 circuits- right turn/brake lamp, left turn/brake lamp, running lights and ground. The 4 flat connector doesn't have enough circuits nor the necessary wire thickness or gauge to carry voltage to the trailer bakes. It would seem fairly logical that you could run a wire from the brake lamp...
      view full answer...
    • Trailer Left Brake Light Does Not Work with Trailer Connected to a 2003 Dodge Ram 1500
      Normally when all the lights work on a trailer except one or one side it is a ground issue. Ground problems usually show up when there is more of a draw on the system. The brake light is the brightest light requiring constant higher voltage than the other lights. A weak ground would cause the brake light not to light up. Check the offending tail light for a good ground. Trailer lights usually ground through the mounting studs if there is not an obvious ground wire. In either case, the...
      view full answer...
    • Matching Wishbone 4-Way Wiring to Vehicle that Uses Standard Wiring Configuration
      The configurations you described match two different styles of 4-way wiring. Wishbone 4-way wiring where a running light circuit wire is ran to either side of the trailer (yellow/brown and green/brown on the trailer), and then standard 4-way wiring where there's only one running light circuit wire like what's on your Blazer. The colors should match color for color in the rewiring process. The yellow/brown and green/brown wires need to run to the single brown wire pin of the Blazer wiring....
      view full answer...
    • Troubleshooting Trailer Turn Signals that Both Blink When One is Applied
      Sounds like the left and right stop/turn circuits are shorting out to each other somewhere. Typically this is a corrosion issue or cut or exposed wire. You will want to start at the connector looking for corrosion or bent pins and work your way to the wiring looking for cut or exposed wire making your way back to the light assemblies. I attached a help article on troubleshooting trailer wiring for you to check out as well.
      view full answer...
    • Troubleshooting Trailer Wiring When Connecting a 4 Flat Vehicle Side to 4 Flat-5 Wire Trailer
      The issue you are finding with your 2001 Isuzu Rodeo and your trailer doesn't have to do with the 4 wire vehicle side and the 5 wire trailer 4-way. Many trailers use what is called a wishbone harness that will run two wires to the same pin for the running lights. This style of harness simply make it so no jump wire is run from one side of the trailer to the other to pick up that running light signal because it is independently run to each side from the connector. The issues you are...
      view full answer...
    • Installing Trailer Wiring Harness on 2009 Lexus RX350 with Factory Tow Package
      If you are using harness # 18002 then you would ground the white wire to a clean, bare metal surface. The white is the ground for the harness. The wires that you are tapping into on the vehicle will use that ground and it should still work. It is possible that the ground on the factory harness is tucked up further towards the front of the vehicle for some reason so you will want to cut back the covering/loom to see if there are more wires. The ground may not be white on the vehicle harness....
      view full answer...
    • Troubleshooting Running Light Circuit on Trailer
      I would begin by testing the trailer connector on the vehicle to rule that out. Turn the headlights on, and use a circuit tester like part # 40376 to test the socket on the connector fed by the brown wire. If you are not getting a signal on this pin, you might have a blown fuse. Make sure the ground wire from the connector on the trailer is securely grounded to the trailer frame and that each lamp is grounded to the trailer frame either by an individual ground wire connected to the trailer...
      view full answer...

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