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4-Pole Trailer End Connector

4-Pole Trailer End Connector

Item # 18004
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Draw-Tite Trailer Connectors - 18004
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Lowest Prices for the best trailer wiring from Draw-Tite. 4-Pole Trailer End Connector part number 18004 can be ordered online at or call 1-833-496-1390 for expert service.
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  • Reviews (35)
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Draw-Tite Trailer Wiring - 18004

  • Trailer Connectors
  • Trailer End Connector
  • 4 Flat
  • Plug and Lead
  • 0 - 5 Feet Long
  • Draw-Tite

Tow Ready 4 Way Flat Trailer Connector by Draw-Tite, Hidden Hitch and Reese

  • 12" 4-Pole Trailer Connector, Trailer End

Tow Ready # 118004

118004 4-Pole Trailer End Connector

California residents: click here

Video of 4-Pole Trailer End Connector

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

Video Transcript for Draw-Tite Wiring - Trailer Connectors - 18004 Review

Today, we're going to review part number 18004. This is the Draw Tite 4-Pole Trailer End Connector. This is 12 inches long. It also comes with the 4 wire caps to attach it to the wires on your trailer. Basically, the standard 4-way wires would be the white for the ground, the brown for the tail lights, the yellow for the left turn and brake, and the green for the right turn and brake, so when you go to attach this to your trailer, you do want to test the wires using a tester to make sure you connect the wires function to function, because sometimes the colors will not always match up. A good thing to do is to use a tester that we sell separately on our website that you can use to test the wires and then hook these wires using the included wire caps. That should do it for the review on part number 18004, the Draw-Tite4-Pole Trailer End Connector. .

Customer Reviews

4-Pole Trailer End Connector - 18004

Average Customer Rating:  4.7 out of 5 stars   (35 Customer Reviews)


Landlord dog chewed up the wire harness and this new has being doing the trick ever since! (Over a year now)


Pretty straight forward. I used it to switch my European trailer's connection to be able to connect to my Wrangler's 4-pin trailer hookup.
No issues. works great.

The parts are still on my European trailer and working well! The trailer is a German brand and started its life there in Germany being pulled by my American-spec Jeep Wrangler. The trailer’s wiring and the Jeep’s connections needed to be massaged in order to work. The parts I ordered from etrailer and the writeups for the project on your site made it all possible. Now the trailer is titled and registered in Virginia and enjoying its life on this side of the Pacific!
Aaron - 03/27/2019


The video on installing the trailer hitch was very helpful to me. I was fooled by the Trailer End Connector. I assumed it was the wire connector that I needed to attach to my car, and there was no wiring instruction. So I struck out there. Fortunately I had someone who knew what they were doing help me to wire the proper connector to my car. Your service overall was fast and I did appreciate all the help we received from you. Earl Dekat


The wiring harness worked great. I used it to connect a back up camera..Instead of fooling around with getting to the back up wires on the tail lights, I just clipped the harness to the wires on the back up camera(one live, one ground) and plugged that into my 4 pole trailer plug in the back of my pickup. when I turn on my headlights. it turns on the camera. It took all of 3 minutes to do that vs God no how long trying to disassemble and reassemble the tail lights to find a backup wire.


received the item in 4 business days, just in time to fix my trailer for commercial lawn service.

Never used wire caps before, they are great. My 4 pole trailer harness actually has 5 wires, to my surprise, and I was able to fit both brown (running lights) in the cap and it works fine. I did wrap it all up with electrical tape to be safe.


Perfect product. Great installation instructions. Now I need European adaptor to fit European trailer lights.


I ordered the Hidden Hitch with a 4 prong flat blade plug-in, the cover and mount for the plug-in, which I installed on an '09 Hummer. The product seems to be well made, it installed easily and to my surprise it was delivered in two days. Thanks


Great value! Exactly like the original harness plug that came with the trailer 12 yrs. ago. Even comes with 4 wire taps to make a secure waterproof connection.


Great product easy to install don't care for the clips used my own connectors. E Trailer again exceeds all expectations. Thank You


high quality, exactly as described. is a very useful and knowledgeable website.


Good plug assembly

Worked very well- good assembly
Ron F - 08/22/2015


The quick connectors made replacing the old bad trailer connection quick and easy.


Needs butt connectors, not splitters.


It really was easy to install. And it continues to work well after one year of use.


It did the job, I soldered all of my connections followed by shrink tubing.


I was a little worried about ordering this product because the cost seemed cheap!
After receiving it in the mail I installed it right away and I have to say I am very impressed with the quality of the product.
The entire process from ordering to fast shipping was a great experience. Pricing and shipping was great and I would definitely recommend this store to anyone.


Exactly what I expected and worked grea t.

No problems. Very happy with the product.
Matthew - 06/05/2019


As ordered and delivered on time.

Working as expected, solid product.
Wayne - 05/28/2017


Installed easily. I used my own butt splice connectors instead of the ones supplied with the plug.


As described Appears to be good quality. Have not yet used.


Fast shipping. Good packaging. Easy to install. Well made. All in all a great buy!


It took a little longer to get than expected, but it arrived in good condition. I have not plugged in the lights to check it out yet. Customer service was great...


The product was excellent and worked to perfection.


Great product. Hasn’t let me down yet!


Seems to be ok but the wire length is much shorter than expected. Will still work fine, just be ware.

Show More Reviews

See what our Experts say about this Draw-Tite Trailer Wiring

  • Troubleshooting Dim Trailer Running Lights
    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...
  • Trailer Turn Signal Does Not Work when Running Light Wire is Connected
    This does sound like a ground issue or could possibly be a short internal to the light. 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...
    view full answer...
  • Right Side Trailer Lights are Not Working But Vehicle Side Trailer Connector is Working
    You have what is called a wishbone harness. A wishbone harness has two running light wires, one for each side of the trailer, but they are tied to the same pin on the trailer connector. The yellow/brown is running lights for the left side and the green/brown is running lights for the right side. Solid yellow is left turn signal/brake lights and solid green is right turn signal and brake lights. The white wire is the ground wire. Usually if some or none of the lights are working it is a...
    view full answer...
  • Trailer Running Lights Flash when Turn Signals are On
    Somewhere in the wiring the turn signal wire(s) is touching the running light wire. This is likely happening closer to the front of the trailer, perhaps at the connector but I would not rule out a short anywhere from the front to the back. Also, by any chance does the wiring on the trailer side behind the trailer connector have 2 wires associated with just 1 pin? If so this is a wishbone harness. You would have one running light wire for the left side and one for the right side but they...
    view full answer...
  • Trailer Running Lights Not Working After Installing New Light and Also Trying to Reuse Old Light
    It does sound like a short or a ground issue. Check the trailer wiring for any pinched or damaged wires and repair as needed. 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 metal surfaces. If there is anything between a light ground and the metal trailer frame...
    view full answer...
  • Troubleshooting Tail Lights on Trailer Only Work When Running Lights Are Turned Off
    I tend to think it's a ground issue or potential short on your vehicle side wiring. Make sure that the vehicle side and trailer side connectors are clean and free of corrosion inside and out. The main connector ground should be attached to clean and corrosion free bare metal surfaces. Also, I would check the grounds for each of your tail lights. If the trailer has an aluminum frame, tilt bed, or folding tongue, any of these things can interrupt the ground. Running jumper wires from the...
    view full answer...
  • Troubleshooting Right Turn Blinker Not Functioning on a Trailer
    It really sounds like the ground is not making good enough contact on the right turn signal/tail light and because of that it isn't able to draw enough amperage to illuminate the blinker function of your bulb. Nearly every time we encounter this problem the issue is just that the assembly isn't grounded enough. Make sure that the trailer side connector are clean and free of corrosion inside and out. The main connector grounds should be attached to clean and corrosion free bare metal...
    view full answer...
  • Troubleshooting Green Wire on Trailer Pulled by 2003 Ford Expedition
    On a 4-Way flat trailer wiring harness, the green wire will go to the right turn signal. The white is the ground, brown is running lights, and the yellow is left turn signal. Take a look at the trailer wiring diagram that I included. This very well could be a ground problem. If so, correcting the bad ground or broken wire could solve the problem.
    view full answer...
  • Tow Package Fuses for a 2007 Lincoln Navigator
    It is very likely that your trailer's running lights are not working due to a blown running light fuse on your 2007 Lincoln Navigator. We have people come to our shop with trailer light issues and 90 percent of the time the problem is either a bad ground or a blown tow package fuse on the tow vehicle. The tow package fuses are located in the power distribution box under the hood. The fuse for the running lights is in location 12 and it is a 25 amp fuse. There is also a relay in location...
    view full answer...
  • Working Running Lights, But No Turn Signals or Brake Lights On Trailer
    You will first want to check the fuses on your tow vehicle. Some vehicles could have fuses for operating the turn signals and brake lights of a towing package. You will want to check if they are installed and working properly. The next thing is to make sure the wires on the trailer plug is wired properly to the trailer. If you have a 4-Way connector on the trailer the white wire is for ground, the green wire for right turn and brake, yellow wire for left turn and brake, and the brown wire...
    view full answer...
  • Turn Signals Not Working on Trailer When Connected to 1994 Dodge Dakota With 4-Way Connector
    You will first want to check the fuses on your 1994 Dodge Dakota since it is just the turn signals that are not working. Some vehicles have fuses for operating the turn signals when towing a trailer. You will want to check if they are installed and working properly. If the fuses are all good then you will need to check the trailer connector on the vehicle and trailer for a ground connection issue, or a short on the tail light circuit on the trailer. Open them up and make sure there is...
    view full answer...
  • Diagnosing, Locating and Repairing Trailer Ground Problem
    My suspicion is that you have a poor ground connection somewhere on your trailer. The fact that everything works fine until the running lights are turned on is the dead giveaway. When the tail lights are turned on, the trailer lighting is drawing maximum amperage through the system. If there is a ground problem, this is when it will manifest itself. There are several places to look for a poor ground connection. Lets start with the trailer connector on the vehicle. Trace the white wire...
    view full answer...
  • How to Install the 4-Pole Trailer End Connector # 18004
    You will want to wire by function to install the 4-Pole # 18004. The easiest way to do that would be to get a 12-volt battery and jumper wire to apply the 12 volts to the wires of your trailer to see which tail light function get illuminated. Or you could trace the wiring back to see where each wire terminates and figure it out from there. The white wire is the ground. The brown is the tail lights. The yellow is the left turn/brake signal. The green is the right turn/brake signal.
    view full answer...
  • Troubleshooting Trailer Lights Turning off When Brakes are Applied
    What you described sounds like a textbook ground problem. It sounds like the ground is just good enough so that most of the taillight functions work, but when you apply the brakes the ground is not strong enough for that and all of the lights shut off. I would first check the condition of the tail light wiring checking for exposed wire or corrosion and fix as necessary. You should also make sure that if your new tail lights ground through the mounting hardware that the surface they attach...
    view full answer...
  • Trailer Running Light Fuse Location on a 2012 Dodge Ram 3500
    There is most likely a separate fuse and/or relay for the running light circuit on your 2012 Dodge Ram 3500. The easiest way to find any fuses or relays is to use the owners manual and/or legend on the power distribution box lid for the locations of items related to the tow package wiring. From what I could find in the online version of the owners manual, the trailer tow lamps/park lamps fuse is in cavity J14 and requires a blue 20 amp cartridge fuse.
    view full answer...
  • What Circuits do the Wires of the Draw Tite 4-Pole Go To
    The wiring of the 4-Pole # 18004 that you referenced is as follows. White is ground Brown is tail light Yellow is left turn Green is right turn I attached an FAQ on wiring for you to check out also.
    view full answer...
  • Trailer Brake Lights/Turn Signals Do Not Work After Installing Wiring Harness on 1984 Toyota Pickup
    Since you have tested and everything works on the vehicle side the issue must be on the trailer side. But to be sure make sure the harness you installed is properly grounded to a clean and corrosion free bare metal surface and that all the fuses related to the tail lights are good. On the trailer, first make sure the trailer connector is clean and the pins do not have any corrosion on/in them. Then make sure the main trailer connector ground is attached to a clean and corrosion free bare...
    view full answer...
  • Trailer Turn Signals Blink Opposite Only When the Running Lights are Turned On
    It sounds like you have a ground issue. Ground problems show up when there is more load on a system. In this case with the running lights on there is more load on the system when you go to using the turn signals or brakes. You will want to check the main trailer connector ground and the grounds for all of the lights and make sure they are attached to clean and corrosion free bare metal surfaces. Also make sure that the trailer connectors on the trailer and vehicle side are clean and free...
    view full answer...
  • Troubleshooting Trailer Running Light Circuit
    If you have tested the plug on the RV, and each circuit is functioning, then 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...
    view full answer...
  • Running Lights Stopped Working on Tent Camper
    The spark was most likely an indication of a short circuit that has blown the running light circuit which is why none of the running lights are working. You mentioned the fuses on the truck but if the tent camper is plugged into the truck then there can be separate tow package fuses that you will need to check. Find their locations using the owners manual. You will also want to make sure that the connectors are all clean and corrosion free inside and out. Any and all lights will need to...
    view full answer...
  • Trailer Turn Signals and Brake Lights Do Not Work But Trailer Connector on Toyota Tundra Works
    Since the brake light and turn signal functions are working on the truck side trailer connector, that indicates a problem on the trailer side. The first thing you are going to want to check is the trailer side connector. Make sure that it is clean and free of corrosion inside and out. Then make sure that the main trailer connector ground is attached to a clean and corrosion free bare metal surface. Next you will want to make sure that the grounds for the lights are also attached to clean...
    view full answer...
  • Only Some LEDs Illuminate on LED-Type Trailer Lights on Boat Trailer
    It sounds as though there is an issue within the one left-side LED light assembly itself. Since LEDs draw so little power it is unlikely that there is an issue with overloading the trailer wiring. If only 7 of the 10 LED elements are now working it is most likely that the problem is in the light fixture itself. LED-type lights do not have user-replaceable elements so it will probably be necessary to replace the entire fixture. Not all LED trailer lights are fully submersible. You definitely...
    view full answer...
  • Diagnosing and Repairing Poor Ground Connection on Trailer
    Everything works okay until you activate the running lights and draw maximum amperage through the system. This is the classic symptom of an insufficient ground connection. Find the main grounding point on the trailer by tracing the white wire from the trailer connector. This wire will usually ground to the trailer tongue. Make sure this connection is tight and that the connection is not corroded. Then check the ground connection for each of the trailer lights. Trailer lamps can ground...
    view full answer...
  • Troubleshooting No Running Lights Functioning on a Trailer While Other Circuits Work
    Based on what you described it sounds like the running light circuit is somehow shorting out between the trailer connector and the light assemblies. A lot of trailer lighting issues are ground related, but since your brake lights are functioning the problem has to be somewhere on the taillight circuit itself. I would start at the connector looking for any corrosion (fix as necessary) and then work your way back from there looking for any cut or exposed wires on the circuit to each light...
    view full answer...

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