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Wesbar 4-Way Flat Trailer Wiring Harness - 20' Long

Wesbar 4-Way Flat Trailer Wiring Harness - 20' Long

Item # 002220
Our Price: $18.48
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Trailer Wiring
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Shipping Weight: 0.72 lbs
002220 - 4 Flat Wesbar Trailer Connectors
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Wishbone-style harness features a 4-pole flat trailer-end connector. Ground wire is 3' long. Great Prices for the best trailer wiring from Wesbar. Wesbar 4-Way Flat Trailer Wiring Harness - 20' Long part number 002220 can be ordered online at or call 1-800-496-5010 for expert service.
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Wesbar Trailer Wiring - 002220

  • Trailer Connectors
  • Trailer End Connector
  • 4 Flat
  • Plug and Lead
  • 11 - 20 Feet Long
  • Wesbar

Wishbone-style harness features a 4-pole flat trailer-end connector. Ground wire is 3' long.


  • Provides simple, efficient method for rewiring your trailer with a 4-way flat trailer-end connector
  • 2 Brown wires, one with the green wire and the other with the yellow, make up the wishbone design
  • Color coded for simple installation
    • White wire (ground): 16-gauge
    • Yellow wire (left turn and brake): 18-gauge
    • Green wire (right turn and brake): 18-gauge
    • Brown wires (tail lights): 18-gauge


  • Overall length: 20'
  • Ground wire length: 3'
  • Limited 1-year warranty

002220 Wesbar 4-Wire Flat Harness

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Video of Wesbar 4-Way Flat Trailer Wiring Harness - 20' Long

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

Video Transcript for Wesbar Wiring - Trailer Connectors - 002220 Review

Today, we are going to be taking a look at Part Number 00220. This is the West Bar 4 Way Flat Trailer Wiring Harness. It is going to have the wishbone style. What that means is coming out of the back of the housing here on the plug, we are actually going to have 5 wires so it's going to double up on the brown wire which is going to be the tail light function so the brown wire, we have one that runs with the yellow wire and we have one that runs with the green wire. That is where we get that wish bone design from. Then we are going to have the four pull flat trailer and connector right here. It has got a nice grip design.

Male end, again this is the trailer end, 4 way flat connector. The unit is going to be color coded for simple installation. The overall length is going to measure 20 feet long so you are going to have a lot of wiring to re-wire your trailer. Your ground is only going to measure 3 feet long. Real quick, I also want to point out that your white wire is going to be gauge 16 wire and then your other wires are all going to be gauge 18.

The green wire is going to be for your right turning brake. Brown is going to be tail light. Yellow is going to be for left turn brake and then the white wire is going to be your ground wire. Here on the end of each wire, it's already going to be stripped back. It just has a nice protective end cap. All you have got to do is pull that off.

That is going to expose the strip portion. That way, it is ready for installation. You can also trim this to fit your particular application. Very easy to cut. Just get some wire cutters and you can cut right through this stuff and trim to fit whatever your application is. That is going to do it for our review of Part Number 002220..

Customer Satisfaction Score:

Customer Reviews

Wesbar 4-Way Flat Trailer Wiring Harness - 20' Long - 002220

Average Customer Rating:  4.9 out of 5 stars   (56 Customer Reviews)

Wishbone-style harness features a 4-pole flat trailer-end connector. Ground wire is 3' long.


I'm extremely satisfied with the wesbar 4way flat trailer wiring harness I purchased from It was very easy to install with no problems. As long as you connect the wires correctly (example) white wire to white wire brown wire to brown wire you won't have any problems. If I ever need another one I'll know who to order it from


1 year ago, I ordered a wiring harness for my trailer, It worked out perfect.
I would recommend "etrailer" to everyone.


Excellent service I did a phone order because I wasn’t sure of exactly what I needed and customer service was fantastic.This is my second hitch I bought the product doesn’t disappoint!!


The harness has everything I needed to replace the old, spliced up, wires everywhere harness to a more manageable, easy to protect harness. The length was good for wrapping around tie down areas so the harness would not sag below the trailer chassis. Using waterproof crimp connectors to the tail lights finished the rewire.

Still doing well
John W - 07/09/2021


I have purchased many products from e-trailer and have always found they worked like they said they would. The last order I received was a seven too four flat plug for a trailer lights. Anna the person I talked too helped me find just what I needed.


Super fast shipping and excellent commu nication!


Good quality. Works fine. No complain ts.


Great product. High quality trailer wiring kit. Would purchase again from etrailer.

Great Product. Exactly what was needed to replace old wiring harness for a utility trailer. Quality product, came with all items needed and easy to follow instructions for installation. Will purchase more items as needed from
Pete B - 05/15/2021


It was what I required


I ordered the wiring package for my 2001 Toyota Tundra truck. It had never been wired for a trailer. I was afraid to use my trailer at night for "no lights" so I decided to wire the truck so that my trailer would have lights at night. I have never done anything like this before! I watched a video on how to wire the truck and followed the easy instructions included with the wiring package which was included with the product. I also ordered the reciprocal plug for my trailer. I could not believe how easy it was install this product in the truck and the trailer. After I finished, it took about an hour, it worked great the first time. I was really impressed with this product from etrailer! Thank you etrailer. You saved me a lot of money from buying this same product from Toyota and the labor also for installing this product!


Great products fast delivery helpful emails to help troubleshoot


I was looking for a 4 pin flat harness with 5 wires to replace an corroding harness on my trailer. I asked a question on Sunday and got a reply back the same day with an answer. Placed my order and got a shipping confirmation on that Monday (Memorial Day holiday no less. Have received the harness and it's exactly what I need.


Wanted to replace my broken plug with something close to the original that was on my trailer to be sure all my lights worked correctly without having to do a lot of extra work and modifications. Found the exact plug on- line through you guys and it was a matter of cutting it to the right length I wanted and splicing them together. Everything worked perfectly. Oh yeah. The order to delivery time was excellent. Part actually got here sooner than was told. Great product and great company to work with.


This harness was perfect for my double jetski trailer. Perfect length and well made. Also a bit thicker guage than most.(not that it's needed for LED's) would purchase again if I ever need it but I think with how I waterproofed the connections I'll have years before I need to think about it.


Purchased Wesbar 4-Way Flat Trailer Wiring Harness - 20' Long - 002220. Ordering was simple and easy. Requested 'Priority' shipping and received in 3 days. Wiring harness is good quality and installation was easy.


I have ordered many times through and have never been disappointed. Great service and ever good products. I wish you were in my home town.


all is well with my product purchases and the customer service received from e trailer. you all helped me accomplish my rebuild of a 60 year old made in the usa steel military trailer



Decent shipping speed and my trailer wiring harness and "one LED" taillights worked perfectly after a quick install. Thank you!


We purchased the wiring to redo an old trailer we are rewiring and it looks like it will work perfectly. It really simplifies the whole process of installing the trailer electrical.


I'm so glad I don't have to spend an arm and a leg to rewire and get new taillights for my old utility trailer. Etrailer has low cost, but good quality parts that will make the job quick and easy to get my trailer operational again. They even have instructional videos to help with making repairs if you need them. Thank you so much, etrailer!




This is the right solution toy issue.


Great store, fast shipping


Good quality light kit. I like the LEDs better than bulbs.


Haven't put this in yet. But it looks of good quality for a fair price.
Go Etrailer!

Show More Reviews

See what our Experts say about this Wesbar Trailer Wiring

  • Installing Brown Running Light Wire on Trailer
    When testing the brown wire on your trailer, all of the tail lights on the trailer should be activated. Since you are using a standard 4-wire harness on the trailer, you will need to make sure that you are using jumper wires to provide running light functions for both sides of the trailer. The single brown wire will go back from the 4-Way connector on one side of the trailer, but will then need to be fed to the lights on the other side as well. I have attached a wiring diagram that clarifies...
    view full answer...
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  • Replacement 4-Way Solution for Trailer that Has 2 Wires Ran to Each 4-Way Pin
    Sounds like your 4-way has two wires ran for each pin. This can be wired to a 4-way that has a single wire for each pin. You would just have to run the pair of wires for each circuit to the single wire of the new 4-way. The part # 002220 that you referenced could work but it would be a bit long at 20 feet. You would just need to cut down the length of the wires.
    view full answer...
  • Solution for Adapter for Vehicle 4-Way to Trailer 7-Way
    It sounds like you're looking for an adapter like the Curt Trailer Connector Adapter - 4-Way to 7-Way RV and 4-Way Flat # C57672. The Curt adapter should be mounted to your vehicle. This will have both the 4-way and 7-way connection. Since it sounds like you don't need the 12V power or brake output you can leave the additional connections disconnected. All you will need to do is plug in your existing 4-way to the 4-way plug on the adapter. Once this is done, the 7-way connector will have...
    view full answer...
  • Availability of Just 4-Way Connectors
    What harness are you looking for? Like a 4-way that comes on part # 002220? We have the part # 48195 as well or the part # 9653P that comes with both sides plus wiring if needed. You would just cut the middle of the wiring and would have wire for both sides.
    view full answer...
  • Availability of 20 ft Long 4-Way Harness as Well as 2-Way Connector
    We do have a 20 foot long 4-way plug and lead with the Wesbar part # 002220. We do sell 2-pin connectors like with the HM47965 which his 12 inch inches long. Normally you cut the harness in half and wire it to either side of where needed. The amp rating of 4-way wiring is typically between 10 and 15 amps.
    view full answer...
  • How To Connect Vehicle 4-Flat Connector To Loose Trailer Wires
    It sounds like your truck has a 4-way flat trailer connector with yellow, green, brown and white wires (see picture), which is pretty standard. It also sounds like your trailer has 5 loose wires that you are trying to connect to a trailer side 4-way flat connector similar to part # W787264. If this is the case, then it sounds like your trailer came with a wishbone style wiring harness meaning you have two running light wires (brown wires) for each side of the trailer, the left turn signal...
    view full answer...
    Image 1 for Image 2 for
  • Circuits and Functions Supported by 4-Pole Flat Trailer Wiring
    In 4-pole flat type trailer wiring such as part # 002220 the tail light circuit (also known as the running light circuit) is usually assigned to the brown wire which connects to the pin next to the ground pin. You can see this in the photo I linked for you. This type of wiring format does not support an additional circuit for +12V auxiliary power as might be needed to top off a trailer-mounted battery or to operate a jack or winch on the trailer. Other wiring formats with additional circuits...
    view full answer...
  • How to Attach a Trailer with a 3-Way Connector to a Vehicle with a 7-Way Connector
    A 3-way trailer connector is extremely rare and they really do not make any sort of adapter that will allow you to use this trailer connector with a 7-way connector. The only option that I have for you would be to replace the 3-way trailer connector with a 4-way trailer wiring harness and then use a 4 to 7-way trailer connector adapter. It is required by law in most states that your trailer has turn, brake, and running lights therefore if your current trailer's lights do not have these...
    view full answer...
  • What Wiring Harness Do You Recommend for My Small Trailer?
    I did some research on your 1999 Floe Pro 100 Plus, and judging by the size of the trailer, you need the Wesbar 4-Way Flat Trailer Wiring Harness - 20' Long # 002220 or the longer 4-Way Wishbone Trailer Wiring Harness with 42" Ground Wire - 40' Long # A40W42B. With the 4-way flat, you will get turn signals, running lights, and brake lights. If you are looking for something other than a 4-way flat harness for your trailer, please feel free to respond with your needs.
    view full answer...
  • Is a Longer Version of Wesbar 002402 Trailer Wiring Harness Available
    Would a 20 foot harness work for you? If so, Wesbar offers a 20 foot version as part # 002220. This is not a wishbone style harness. You'll need to run the harness down one side to the taillight and then daisy chain over to the opposing taillight. A wishbone style is also available as part # W002230. A wishbone style harness splits the running lamp circuit into two legs so you and run the left turn/brake lamp circuit and one running lamp circuit down the driver's side and the right turn/brake...
    view full answer...
  • Parts Needed to Re-Wire Motorcycle Trailer Wiring Harness For Trailer without Brakes
    The only way to know what wires correspond to which functions on the trailer will be to test them, and the license plate light will be attached to the running light circuit and won't have its' own wire-it's more likely that the red wire you're seeing corresponds to a reverse light circuit. With that said, since the trailer doesn't have brakes you're probably best just wiring it up with a 4 way wiring harness like the Wesbar 4-Way Flat Trailer Wiring Harness - 20' Long # 002220; this won't...
    view full answer...
  • Trailer Lighting/Wiring Kit for Snowmobile Trailer
    Standard 4-pole trailer wiring uses flat-style connectors, like part # W787268 which is a trailer-side connector and part # HM48044 which is the mating vehicle side connector. On these items and on the 16-gauge bonded 4-pole wire # 16-4B-1 you referenced in your question the usual pin/function assignments are the same. These are as shown in the linked photo and in the article on trailer wiring that is included for you. The one pin that is not like the others will be the GROUND pin which...
    view full answer...
    Image 1 for
  • How To Re-Wire A 16 Foot Gooseneck Trailer From Scratch
    To wire your trailer from scratch you should first start by, sketching a diagram of your wiring. That way if down the road there is some issues with your wiring, you're going to know exactly where to look. You're going to need to add a 4 flat # 002220, and a 7 way connector # ETBC7. Next, you'll need to add rear lights # M880-7 if you do not have any currently. Finally, for brakes, you'll need to first determine what the axle capacity is first. You can determine this by checking the axle...
    view full answer...
  • Replacement Wiring Needed for a 6 x 10 foot Trailer
    We don't actually manufacture our wiring harnesses, but we do have some options available for you. You can use the Wesbar Wiring Harness # 002220 to replace the wiring on your 6 x 10 aluminum trailer. To complete the installation you will only need a Ring Terminal # DW05702-1 and Butt Connectors, part # DW05744-5 for 5 or part # DW05744-10 for 10. Just simply splice in the lights that you have into the wiring. If you don't already have lights then you can use the Trailer Light Kit #...
    view full answer...

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Info for this part was:

Employee Lindsey S
Written by:
Lindsey S
Employee Jameson C
Expert Research:
Jameson C
Employee Laura H
Updated by:
Laura H
Employee Wilson B
Updated by:
Wilson B
Employee Alexander C
Updated by:
Alexander C
Employee Cole B
Installed by:
Cole B
Employee Robert C
Installed by:
Robert C
Employee Chris R
Video Edited:
Chris R

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