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Wesbar Wishbone Wiring Harness with 4-Pole Flat Trailer Connector - Trailer End - 18" Long

Wesbar Wishbone Wiring Harness with 4-Pole Flat Trailer Connector - Trailer End - 18" Long

Item # 002402
Our Price: $13.74
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Trailer Wiring
Shipping Weight: 0.11 lbs
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Wesbar Trailer Connectors - 002402
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Wire your trailer with this universal, splice-in wiring harness so that you can connect the trailer's wiring to your vehicle's during towing. Wishbone design removes need for a jumper wire between tail lights. Great Prices for the best trailer wiring from Wesbar. Wesbar Wishbone Wiring Harness with 4-Pole Flat Trailer Connector - Trailer End - 18" Long part number 002402 can be ordered online at or call 1-800-940-8924 for expert service.
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  • Reviews (329)
  • Q & A (0)
  • Videos (2)
  • Photos

Wesbar Trailer Wiring - 002402

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

Wire your trailer with this universal, splice-in wiring harness so that you can connect the trailer's wiring to your vehicle's during towing. Wishbone design removes need for a jumper wire between tail lights.


  • 4-Pole flat trailer-end connector plugs into the 4-way flat on your tow vehicle
  • 2 Tail light wires of wishbone-style harness make wiring your trailer more efficient
    • One tail light wire (brown) is bundled with left turn and brake wire (yellow), and one is bundled with right turn and brake wire (green)
  • Color-coded wires allow for simple hardwiring to existing trailer connections


  • Harness length: 18"
  • Wiring configuration
    • White: ground wire
    • Yellow: left turn/brake light
    • Green: right turn/brake light
    • Brown - tail lights
  • 1-Year limited warranty

002402 Wesbar 4-Pole Flat Trailer End Connector - Wishbone Harness - Trailer End - 18" Long

Video of Wesbar Wishbone Wiring Harness with 4-Pole Flat Trailer Connector - Trailer End - 18" 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 - 002402 Review

Speaker 1: Today we're taking a look at the Wesbar four-pole flat connector. This connector provides simple efficient method for rewiring your trailer, with a four-way flat trailer end connector.So, this would hardwire into your trailer's wiring, and then it would provide the plug, which would plug into the tow vehicle to send the signals back to the trailer.It's a nice design. When it comes to the wiring, you actually have two brown wires on the unit. So, you have a singular white wire, and then you have two brown. One brown runs with the green, the other brown runs with the yellow. So, this gives it the wishbone design.

That way you can run your stop, and turn, and tail signals down each side of your trailer.The connector has a easy grip design on the sides, and it's easy to identify, because the wires are labeled. So, your white wire's your ground wire, and then on the actual brown and green wire, the green says right turn, so that would be right turn and brake, and then brown is taillights, and then yellow is your left turn and brake, or driver's side, and then brown that runs with that is for the taillights.That's gonna do it for today's look at the Wesbar four-pole flat connector.

Customer Satisfaction Score:

Customer Reviews

Wesbar Wishbone Wiring Harness with 4-Pole Flat Trailer Connector - Trailer End - 18" Long - 002402

Average Customer Rating:  4.9 out of 5 stars   (329 Customer Reviews)

Wire your trailer with this universal, splice-in wiring harness so that you can connect the trailer's wiring to your vehicle's during towing. Wishbone design removes need for a jumper wire between tail lights.


Just what I wanted. No one had one in stock in San Bernardino Ca. I searched auto parts, trailer supply and rental yards. i found plenty of 4 pin but with 4 wire harnesses, i needed a 4 pin 5 wire hook up. Took all of 35 minutes to install in 5 steps
1. tinned wires on connector and trailer
2. soldered wires together
3. installed shrink sleeve
4. wrapped harness in protective harness
5. hooked up to vehicle ops check good.
See photos below. Thank you

Phillip L.


Works great no problem. Glad I made the investment.


Very satisfied! Thank you you are the only company I could find to order a 4-pole wishbone 5 wire harness. Had a problem with the Post office but, Customer Service helped me out. Great service all the way around. Thanks again, D.King


I could not find a 4 pin 5 wire harness at the local auto parts stores, this is exactly what I needed. Service was great and the harness arrived ahead of the scheduled delivery date. Thanks etrailer!!



After one year of use, the wiring harness is performing exactly as I needed, thanks e-trailer.


Delivery time good! Product as described. Only issue is the white wire on connector came out of plug assem.E-trailer folks are great to work with on your trailer needs.



Now have connections issue with prongs making contact. Have cleaned still have issue. Lights on trailer blink going down road. Going to reorder and try one more time. I know its the connector you can twist it and lights will come on. Not a issue with trailer. GROUND is connected ????

Etrailer Expert

Katrina B.


Let me get you in touch with someone that can assist you with troubleshooting.


Everything I ordered fit Perfect and Love the video's they are very clear and makes any installation easy to do.



I still love it. No issue at all. The videos for how to install are the best. Thats what made me buy your product, because it gave me the confidence to do it myself. Thanks so much for a good product,


I have a plug that was nearly broken so I looked at images to order this. Got it and put it on today. Perfect match for a 4 way flat wishbone plug.



After a year this product is still working and have no problem whatsoever. I give it 5 stars


Peyton did an excellent job
I had a
connector I could not find anywhere
She took the time to research, find the right item and get it to me
Friendly, polite and very helpful
Great Job !!!


As ordered needed 5 wire to 4 plug which, though widely used on landscape trailers, is not so easy to find
Theirs is just what was needed
The only complaint was lack of shipping and tracking info which they promptly responded to when questioned


Just what I needed for my trailer appli cation



The product is still working as it should. Thanks, etrailer.


This product worked wonderfully for my double jetski trailer. Splicing this in was definitely easier than rewiring the entire trailer. Extremely fast packing as well. Ordered on Sunday night. Packed and labeled Monday morning. It was on my porch by that friday.


After searching many places I found exactly what I needed at etrailer. Each wire was labeled and made the work very easy.


Worked perfectly. The trailer had 8 wires but just matching colors worked. Back up and running in a short time.


Well made and sturdy five-wire, four-prong connector. Exactly what I needed!


Coming back from my last camping expedition I broke the wires to my trailer. Got on the web site for e trailer and ordered the part. The right part came in quickly. I’m so glad to have a site to go to in an emergency. Happy camper


Good product and simple install



“Takes a licking but keeps on ticking”


Year 1 : still works great as it should.
I’ll return once a year to update y’all


Have not in stalled it yet but looks go od


Great service, correct part, inexpensive,& on time


Exactly what I needed. Easy hook up & lightning fast delivery. I will be using etrailer for now on.



No complaints. Still working like the day I purchased it.


After owning and using this harness/plug for about a year now its held up very well. I have had no negative experiences with it and everything is still working just as it should. If I am ever needing another one I would definitely repurchase this product again!




I am very pleased with the product. I appreciate the high quality materials.


Excellent product. Had no issues splicing in this new harness. I highly recommend this product.


Worked just fine.


Working great

Show More Reviews

See what our Experts say about this Wesbar Trailer Wiring

  • Troubleshooting Trailer Lighting Where One Side Running Light and Other Side Blinker Doesn't Work
    Usually when there is odd trailer lighting behavior like this that doesn't seem to make much sense the issue is weak grounds on the trailer. I would go over the grounds for each assembly as well as just make sure all of the wires are currently connected properly. I attached a help article link on trailer wiring troubleshooting for you to check out as well.
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  • Trailer Wiring Connector for Trailer 4-Way Wiring That Has 8 Wires
    While we don't have a 4-way connector that has 8 wires total that run to it you can use the Wesbar Wishbone connector part # 002402 which has two wires ran for the running light circuit. You'd just need to match up the remaining circuits to this harness by running the two wires to the single wire on the connector's wiring.
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  • Replacement 4-Way Solution for Trailer Wiring 4-Way that Has 6 Wires
    We don't have anything exactly like that but the Wesbar 4-way part # 002402 that you referenced would work well for what you are looking for. You'd run both of the white wires to the white wire of the 4-way, both of the browns to the single black wire, and then green to green, and yellow to yellow.
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  • Replacement Trailer 4-Way Recommendation for 4-Way with 6 Wires Ran to It
    You'd need a wishbone style 4-way replacement like the Wesbar part # 002402 which you'd wire in color for color. The only wire you'd need to run down into a single wire is the white wire since you have a wishboned ground circuit as well as the Wesbar does not have that.
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  • How to Convert a Wishbone 5-Way to a Wishbone 4-Way Trailer Connector
    It looks like you have a 5-way wishbone wiring harness. I cannot say for certain but my guess would be the that the following are true: White Wire = Ground Green/Brown = Right Running Light Yellow/Brown = Left Running Light Yellow = Left Turn/Stop Light Green = Right Turn/Stop Light Red = Reverse Light/Brake Output In order to test this you will need to apply 12 volt power to each wire and see which circuit it activates. For a 4-way wiring harness to replace this you are going to want...
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  • Replacement Wishbone Style 4-Way Trailer End Plug
    Thanks for that photo and what you have is a wishbone style wiring harness, although the colors are inconsequential for a harness because there isn't a standard wiring code that is color-for-color. You can replace your harness with the Wesbar Wishbone Wiring Harness with 4-Pole Flat Trailer Connector - Trailer End # 002402 but you will need to wire it by function. This means you'll have to apply 12 volts to your wires via a battery to determine the function of the wires so you can connect...
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  • Replacement 4-Way Recommendation for Trailer with 7-Wires
    Sounds like your 4-way is a wishbone setup where the circuits that run to both sides of the trailer that are the same have two wires instead of just one. This is probably the ground and the running lights but it's hard to say for sure. Basically you would need to look at how the wires run to the back of the 4-way to determine which circuits are doubled for each pin. We have the replacement 4-way part # 002402 which has just the running light circuit wishboned which would work great. For...
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  • Replacement 4-Way for Trailer with 5 Wires Ran to It
    It's pretty common for 4-way wiring to have a total of 5 wires ran to it as the running light circuit runs to both sides of the trailer. This is referred to as wishbone 4-way wiring. We have an 18 inch 4-way with wishbone wiring with part # 002402 which would wire right up to your trailer. Or if you want to convert to a standard 4-way type of wiring you could run both of the wires together on your trailer wiring for the running light circuit and then go to a single wire 4-way.
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  • Installing New 4 Way Connector on Trailer with Yellow, Green, Yellow/Brown and Green/Brown Wires
    It sounds like your trailer had a wishbone style wiring harness. A wishbone harness splits the running light circuit at the connector so you do not have to run a jumper from one side of the trailer to the other side. To replace the plug you're going to be best served by using a wishbone harness like the Wesbar Wishbone Wiring Harness with 4-Pole Flat Trailer Connector - Trailer End - 18" Long # 002402- you can still use a regular 4 way, but it will be more work. Using a wishbone harness...
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  • Wesbar Trailer Side 4-Way Recommendation with Short Wire Leads
    The Wesbar trailer end 4-way we offer that has the shortest amount of wire lead is the part # 002402 which has an 18 inch wire lead.
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  • Recommended 4-way To 5-way Adapter For Motorcycle Towing Motorcycle Trailer
    Typically the blue wire on a 5-way connector is for reverse lights. If you do not need the reverse lights you can actually just plug the 4-way connector directly into the 5-way connector. If you need the reverse lights to work you will need a 4-way to 5-way adapter # C57187 installed on your motorcycles 4-way and will need to connect the blue wire to the reverse light wire with the included quick splice. I included a video of the # C57187 being installed for you to take a look at.
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  • 4-Way for Vehicle Side to Match Wesbar Wishbone 4-Way # 002402
    Since the Wesbar wishbone 4-way part # 002402 is a standard 4-way all you'd need is something like the part # HM48030.
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  • Will 2 Ground Wires Fit Together Inside a 6-Pin Connector For Flat Towing a Vehicle?
    On a 6-Pole, Round Pin, Plastic Trailer Wiring Socket # PK12720 there is typically only enough room for one wire for each terminal to mount inside the stud. You can still splice both the ground wires together and run a single wire into the terminal on the connector.
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  • Replacement 4-Way for Trailer that Has 8 Wires Ran to Connector
    It really just depends on what the wires are for. Most likely you have several ground wires among the 8 as well as a couple running light circuits in there as well. You just have to run all of the wires to the correct circuits and if you have to run more than one trailer wire to a 4-way wire it will still work just fine. We have the part # 002402 which has two wires for the running light circuit. The rest of the circuits would just need to be ran together on the corresponding 4-way circuit.
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  • Troubleshooting 4-Way Trailer Wiring with 5 Wires That Isnt Working Correctly
    It sounds like your new trailer wiring is designed to connect to a 4-way wishbone connector where there are two brown wires for the running lights. The yellow/brown wire is for the running lights on the left side and the green/brown wire is for the running lights on the right side. This makes it so you don't have to use a jumper wire to go from one side to the other. What you've tried to do should work; connecting the two brown wires to the single brown wire on the connector. Since...
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  • What Gauge Wire Does The Westbar Wishbone Wiring Harness Use?
    The Wesbar Wishbone Wiring Harness with 4-Pole Flat Trailer Connector - Trailer End - 18" Long Item # 002402 uses 12 gauge wire. I recommend Deka Heat Shrink Butt Connector - 12-10 Gauge - Nylon Insulation - Yellow - Qty 5 Item # DW05745-5
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  • Can Trailer with Brown Yellow and Brown Green Wires Run to Standard 4-Way
    Yes you would be able to use your current trailer wiring configuration with a standard 4-way that only has 4 wires like the # HM38138 that you referenced. Basically the yellow brown and the green brown wire would wire directly to the single brown wire of the 4-way and the other colors would match and you'd be set. What you have now is a wish bone setup that just has a separate wire for the running light circuit for each side of the trailer. We have 4-ways that are setup for this with the...
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  • Will a Trailer 4-Way Plug Into a Vehicle 5-Way Without Adapter
    Yes, you can plug a trailer side 4-way trailer connector part # 002402 into a vehicle side 5-way connector part # HM37908 without any adapters needed.
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  • Availability of 18 inch Long Wishbone 4-Way Trailer Wiring Harness
    We have exactly what you are looking for with the Wesbar Wishbone Wiring Harness with 4-Pole Flat Trailer Connector # 002402 which is an 18 inch long 4-way harness that has the running light circuit split off for both sides of the trailer like what you mentioned having. You'd run your brown/yellow and brown/green wires to each of the brown wires of this harness and then match the other colors by color and you'd be set. Only thing else you'll want is heat shrink butt connectors like the...
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  • 4-Way for Trailer Wiring Where There is 5 Wires
    What you would want is a wishbone style 4-way kit like the part # 002402 to match the 4-way wiring on your trailer. One of the yellow wires is the running light circuit for the left side of the trailer and one of the green wires is the running light circuit for the right side. Most likely there's a brown stripe which would indicate this. But you might have to trace the wiring to verify this. The two brown wires of the # 002402 would go to these wires and the rest would match color for color.
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  • Replacement 4-way Connector For 2018 Shorelandr Boat Trailer With Two Brown and White Wires
    I am happy to help! To replace the 4-way connector on your 2018 Shoreland'r Boat trailer I recommend the Wesbar Wishbone Wiring Harness with 4-Pole Flat Trailer Connector - Trailer End - 18" Long # 002402. The reason your harness has 2 brown wires is one runs down each side of the trailer, instead of having to run a jumper wire between the two sides. It is a little odd that it has two grounds (white wire) but you can connect them together and then connect them to the white wire on the...
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  • Replacement 4-Way Flat Trailer Connector Recommendation with 5 Wires
    To replace the 4-Way Flat connector on your utility trailer I recommend picking up the Wesbar Wishbone Wiring Harness # 002402 and then making your connections using the Heat Shrink Butt Connectors # DW05744-5. This has the 5 wires coming off of the connector and it sounds like you'll be connecting them per color. Just for reference though, here are the different functions you should find on each of those wires: Green: Right turn/brake light Yellow: Left turn/brake light Brown: Tail/running...
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  • Recommended Solution to Re-Wire 4 Way Trailer Plug with 8 Wires
    I have a solution for you, but you will need to cut off your existing plug and re-wire this to a new 4 way connector. Your current trailer plug appears to have wires for the left (yellow) and right (green) turn signal, brown wires for the running light circuits on the left and right side of the trailer (one for each side), ground wires for all of these independent of each other and a ground for the plug itself that connects to all of the other wires. I recommend using the Wesbar Wishbone...
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  • How To Replace 4-Way Trailer Connector with 6 Wires
    I do have an option for you but none of our 4-way trailer connectors have six wires. That said, you can still easily install a 4-way trailer connector with four wires in place of a 4-way trailer connector with six wires. For this, I recommend using the Hopkins Endurance 4-Way Flat Trailer Connector part # HM48110. The two white wires and two brown wires will be tired together when connected to the single white and single brown wire on the new connector. I recommend using the Deka Heat Shrink...
    view full answer...
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Info for this part was:

Employee Mike L
Expert Research:
Mike L
Employee Jameson C
Expert Research:
Jameson C
Employee Joshua S
Video by:
Joshua S
Employee Jacob T
Video Edited:
Jacob T
Employee Cole B
Installed by:
Cole B
Employee Ryan G
Installed by:
Ryan G
Employee Brian B
Written by:
Brian B
Employee Wilson B
Updated by:
Wilson B
Employee Brian T
Updated by:
Brian T
Employee Hannah L
Updated by:
Hannah L
Employee Daron K
Edited by:
Daron K

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