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Wesbar 5-Pole Flat Connector - Wishbone Style - Trailer End - 40' Long

Wesbar 5-Pole Flat Connector - Wishbone Style - Trailer End - 40' Long

Item # W002290
Our Price: $41.94
Trailer Wiring
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This wishbone-style, 5-wire flat harness is great for a trailer with a surge coupler. The 40' long harness includes a 4' long ground wire and a blue auxiliary wire that signals your trailer brakes to disengage while you are in reverse. Lowest Prices for the best trailer wiring from Wesbar. Wesbar 5-Pole Flat Connector - Wishbone Style - Trailer End - 40' Long part number W002290 can be ordered online at or call 1-636-306-4830 for expert service.
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Wesbar Trailer Wiring - W002290

  • Trailer Connectors
  • Trailer End Connector
  • 5 Flat
  • Plug and Lead
  • 31 Feet and Longer
  • Wesbar

This wishbone-style, 5-wire flat harness is great for a trailer with a surge coupler. The 40' long harness includes a 4' long ground wire and a blue auxiliary wire that signals your trailer brakes to disengage while you are in reverse.


  • 5-Way flat connector provides a male plug for your trailer
    • Works great for marine trailers with surge brakes
  • 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)
  • Auxiliary wire (blue) connects to backup light circuit to disengage trailer surge brakes when you are driving in reverse
    • Hydraulic actuator must have electric lockout feature built in to disengage the trailer brakes
  • Color-coded wires help to simplify the installation process


  • Wire harness length: 40'
  • Ground wire length: 4'
  • Auxiliary wire length: 5'
  • Wire configuration:
    • Yellow: left turn and stop lights
    • Green: right turn and stop lights
    • Brown: tail, license, side marker and clearance lights
    • Blue: auxiliary
    • White: ground wire
  • Blue wire: 18 gauge
  • All other wires: 16 gauge
  • 1-Year limited warranty

002290 Wesbar 5-Wire Flat Trailer End, Wishbone Style Connector - 40' Long

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Customer Satisfaction Score:

Customer Reviews

Wesbar 5-Pole Flat Connector - Wishbone Style - Trailer End - 40' Long - W002290

Average Customer Rating:  4.7 out of 5 stars   (85 Customer Reviews)

This wishbone-style, 5-wire flat harness is great for a trailer with a surge coupler. The 40' long harness includes a 4' long ground wire and a blue auxiliary wire that signals your trailer brakes to disengage while you are in reverse.


I wanted a heavier gauge when re and this particular item is perfect. I did an ohms test and voltage test on the product and it works perfectly and craftsmanship is excellent. Highly recommend this. I can’t provide pictures of install right now. I’m in the process of doing a complete make over on my boat trailer. Repaint, new lights, new brake lines and rewire.


Arrived exactly as advertised.

on salt water trailer and have no issues or sign of the slightest wear.

Being used in saltwater I did not want connectors so one continuous wire was required. At the time this was the best price and value.


Simple replacement to trailer existing wiring


The blue wire was supposed to be 40 feet like the rest of the wires, the harness that was sent has a 5 foot wire which does me no good as it doesn't reach the lights it's supposed to operate. I’m really frustrated with “American” companies that claim to be superior to others and yet they can’t get a simple order right. I had to order this set up because the so-called 20’ wire that I got with my light kit wouldn’t even go the entire length of a 12’ trailer. The 5’ wire does me NO GOOD as it doesn’t reach the lights that it’s supposed to operate. Please explain to me how you’re going to rectify this “made in Mexico” product foul up.

Thank you for the review and for bringing this to our attention. Our customer service team will be reaching out to you in the near future.
-- Etrailer Expert Brooke M - 09/13/2021


It did the job. Quick delivery and as d escribed


Exactly what I needed for my boat trailer. Quick delivery no issues


Prompt and friendly service.


Very happy with the quality of every item I ordered and its not CHINA JUNK, thank you!!!


I purchased this and several other products from to wire my 2020 Jeep Gladiator. I did cover this with aftermarket braided line covers. It was long enough to connect to both rear harnesses. I purchased this or a similar product from etrailer in the past and always get a quality product at a reasonable price.


All ordered items worked great. Love the LED tail lights. Didn't have any problems fixing the trailer thanks to the many technical articles I found on etrailer. Not sure what happened with UPS shipping since I got notified that the parts had shipped on Saturday but didn't get them till Wednesday evening (paid extra for 3 day shipping), but definitely recommend ordering from etrailer.


I completely rewired my boat trailer after patching it for several years because mice and chipmunks were eating the insulation. I installed the product in aluminum flexible metal conduit inside the trailer tube frame. So far so good. The little critters have not been able to get to the wire insulation to chew on it. The plug is well made and seems durable.


Reasonably easy to replace. Issue was doing it in cold weather, while doing other work on the trailer.
One issue was the ground which failed as the tongue was not securely attached to the rest of the trailer. Once recognized the system worked perfectly.


As good as the day I bought it ... since it is still in the original packaging. Purchased it for my boat trailer, project #34 on my list of things to do. Still in the 20's. However, quality, length, materials were exactly as ordered. Will follow up when installed - don't hold your breath!


Being a new boat owner I was quickly overwhelmed by what I didn't know. Re-wiring, re-lighting my trailer was my first project. etrailer has a wide range of products, but most important to me, was their added product information and instructional information which helped me make the right selections to get this done. Add to that is their very competitive prices. etrailer will be my go to source for my future trailer needs.


I will never understand that if I am purchasing a 5 pole harness in a 40' length, WHY would they only give me a 5' lead for the back up wire when I want the lights at the back of my trailer?


Order was correct and timely


Andy was a GREAT etrailer rep. Everything went smoothly. I have used etrailer several times and recommend them.


I probably will return this since the fuse was the problem and not the wiring. However, I have no doubt it would be an excellent product just like everything else I got from etrailer!


Perfect wiring setup for running a 5 wire plug with a backup light wire. Being able to run down both sides of the trailer is exactly what I needed.


Harness wires were bundled as stated and harness went into trailer a frame without issue.


Product just arrived. Looks and feels like a quality wiring harness.


It was just what I needed to replace my patched wiring on my bass boat trailer. I ordered the longer set so I was sure it was long enough.


Nice heavy gauge wire, stripped cleanly without wire breakage at connectors.


East to install


The four prong connector received was to replace a four prong connector which had brown split from one terminal and white split on the other terminal. The result was I had to split the white further down and also split the brown further down which was very difficult.

Prefer to have the split white at the terminal connector along with the brown split terminal at the connector.

great delivery and also great communications with the receptionist .

Show More Reviews

See what our Experts say about this Wesbar Trailer Wiring

  • Wire Gauge Size For Wesbar Wiring Harness # W002290
    You are correct that the lower number on wire gauge means that is is a heavier wire. The Wesbar 5-Pole Flat Connector, part # W002290, you referenced has a 5 ft 18 gauge auxiliary blue wire that connects to the backup light circuit to disengage trailer surge brakes when you are backing up. The balance of the wires are 16 gauge. I have attached a couple of links to helpful articles for wiring on trailers you may wish to check out.
    view full answer...
  • Is Tinned Wiring Used In Trailer Wiring Kits
    The trailer wiring we offer like part # W002290, is designed to be used as a 5-wire harness, and works well with a trailer that has a surge coupler. The wires used in this harness are 16 gauge except the blue brake wire which is 18 gauge, and designed to be able to safely handle the current from a 12 volt system. The wires in this harness are not tinned. From my research I found that tinned wire is normally used in industrial wiring and used when the operating temperature of the wire is...
    view full answer...
  • What Wire Does The Yellow Wire With Brown Stripe On My Trailer Connect To
    On the trailer's 5-way connector the yellow wire with brown stripe is most likely a running light circuit but you want to be sure. There is sometimes a yellow/brown wire which is ran down the left side of the trailer for tail lights and a green/brown wire which is ran down the right side of the trailer for tail lights. Since wire color functions may vary depending on the manufacturer you still want to test the wire to determine the function by using a vehicle battery and jumper wire on...
    view full answer...
  • Replacement 5-Way Flat Wiring for 2005 Four Winns Trailer
    I recommend using the Wesbar 5-Pole Flat Connector # W002290 to rewire your 2005 Four Winns trailer. This is a wishbone style so you can easily route the wiring to each side of your trailer. The regular lighting harness is 40' long while the ground wire is 4' long and the blue wire for the reverse light function is 5' long.
    view full answer...
  • Trailer Wiring Harness With Tinned Wire
    While tinned wiring is the norm when it comes to interior wiring on boats, boat trailers see a minimal amount of water compared to the actual boats. They do use a tin coating on the pins that are the parts of a wiring harness like the Wesbar 5-Pole Flat Connector # W002290 since those are most exposed to moisture, but since the actual wiring is rarely exposed to water I'm guessing that's why they don't go the extra mile when it comes to using that wiring within the harnesses. As far as...
    view full answer...
  • Is There Tinned 4-Way Wiring Available for Boat Trailer Wiring
    While tinned wiring is the norm when it comes to interior wiring on boats, boat trailers see a minimal amount of water compared to the actual boats so it's not the norm for the trailer wiring. They do use a tin coating on the pins that are the parts of a wiring harness like the Wesbar 5-Pole Flat Connector # W002290 since those are most exposed to moisture, but since the actual wiring is rarely exposed to water I'm guessing that's why they don't go the extra mile when it comes to using...
    view full answer...
  • How to Replace a 5 Pole Flat Wiring Harness That Has 7 Wires
    I have a solution for you, but we do not have the exact replacement for this wiring harness. Instead, I recommend using the Wesbar 5-Pole Flat Connector # W002290 to replace your old connector and then combine one of the wiring functions on the old harness into one wire on the new harness. You'll want to test the functions of your existing wires but my best guess is that the way this is currently wired your blinkers have individual ground wires and that harness has no reverse light wired...
    view full answer...
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  • 5-Way Wiring Harness for Boat Trailer
    A wishbone harness means that there are separate wires for the running light circuits - one for each side of the trailer. For a 5-flat trailer end connector for your Ranger boat trailer, a great choice would be the Wesbar 5-Pole Flat Connector # W002290. I've attached a link to a video review of this harness for you to take a look at.
    view full answer...
  • Why Does Wishbone Trailer Wiring Harness W002290 Have Extra Brown Wire
    I could not find etrailer order history for you based on either your last name or your email address so I do not know which vehicle wiring harness you have. The linked page shows the 4-pole trailer wiring kits we offer for your 2008 Nissan Sentra. This is the only type of wiring kit we have for this vehicle. Some trailer wiring kits will use dual running light wires to avoid the need to splice and run that circuit's wire across the sides of the trailer. These are called wishbone harnesses...
    view full answer...
  • 5-Way Recommendation For Trailer that Was Converted to Disc Surge Brakes
    What you would want is the part # W002290 which is a trailer side 5-way flat with 40 inches of wiring. 5-Way rounds aren't common for trailer towing so that wouldn't be your best option. What you'd then want to do is cut all of the wires but the blue to length so that you can wire the 4 wires of the 5-way to your current wiring near the coupler, and then leave the blue wire longer so that it can make it to your reverse lockout solenoid.
    view full answer...
  • Wire Gauge Used on Wesbar W002290 5-Pole Trailer Connector Wiring Harness
    The blue wire on the Wesbar # W002290 trailer connector harness is 18 gauge, and the remaining 4 wires are 16 gauge. I've linked to a product description video for the harness.
    view full answer...
  • Troubleshooting Installation of 4-Way Wiring Connection On Trailer With Different Color Wires
    The wire colors you have on your trailer don't correspond with any typical color pattern. I'm also not sure what your setup is for you to have 5 wires unless the blue wire is coming off of an actuator with an electric lockout. If you have trailer brakes it would be more common to have 7 wires instead. The color code for wiring harnesses can vary between manufacturers, but the general standard for 4-way plugs is as follows: Green: Right turn/brake light Yellow: Left turn/brake light Brown:...
    view full answer...
  • Old Trailer Wiring 5-Way had 6 Wires But New 5-Way Has 5 Wires
    The trailer connector that you had is what is called a wishbone harness. It has 2 running light wires so you do not have to run a jumper wire for running lights from one side of the trailer to the other. Wesbar harness # W002290 is an example of a wishbone 5-Way. All you have to do is connect the 2 running light wires from the trailer wiring together and then to the brown wire on the new harness. Or, if you are replacing all the wiring, you would run a jumper wire from one side of the...
    view full answer...
  • Replacement 5-Way Flat Trailer Side Connector for a Boat Trailer
    It sounds like you have a version of a 5-Way flat wishbone harness like # W002290. A wishbone harness will have 2 running light wires attached to one running light pin. White is ground, the two brown wires are for running lights, yellow is for left turn and brake lights, green is for right turn and brake lights, and blue is for a reverse electric lockout solenoid. Since the wires on your trailer do not match up you would have to trace each wire back to determine the functions. Or you...
    view full answer...
  • Why Won't Reverse Lights of 1990 Coleman Chesapeake Camper with 4-Way Connector Work
    The first issue you mentioned of the reverse lights not working is because your trailer has a 4-way connector which does not carry the reverse light circuit. So to solve that problem you'll have to replace the 4-way of your trailer with a 5-way like the part # W002290 which the blue circuit would run to the power wire of the reverse lights. If your tow vehicle only has a 4-way as well it would need to be converted to a 5-way with the part # 20036 and you'd be set. The 5th wire of this...
    view full answer...
  • Recommended 5-Way Flat Harness With 16 Gauge Wire Over 25 Feet Long
    For that length, I recommend the Wesbar 5-Pole Flat Connector - Wishbone Style - Trailer End - 40' Long # W002290. This has 16 gauge wires with the exception of the blue wire that is 18 gauge.
    view full answer...
  • Comparing Hopkins and Wesbar 5-Way Trailer End Connectors
    An item like a 4-Way flat connector, in this case # HM47910, is fairly easy to manufacture so Hopkins and Wesbar are going to be comparable. In this case I like the extra loom protection on the Hopkins. It has also been rated high by customers who have left reviews for it.
    view full answer...
  • Can the Wesbar 5-Pole Flat Connector be Used on a Reverse Circuit
    Yes, you are correct in that the blue wire on the Wesbar 5-Pole Flat Connector part # W002290 can be used for the reverse light circuit. I have listed for you below the way I recommend wiring the connector. Yellow: Left Turn/Stop Green: Right Turn/Stop Brown: Tail Blue: Reverse White: Ground Please note that however you wire the trailer side connector, the vehicle side connector will need to match it in order for the lights to function properly. If you don't already have a 5-way on the...
    view full answer...
  • Recommendation to Replace Trailer 5-Way That Has 9 Wires
    It sounds like the current 5-Way connector on your trailer has a type of wishbone wiring design, which uses separate wires for the signal lights on both sides of the trailer. Most likely yours has a separate wire going down each side of the trailer for the running lights, brake lights, and reverse light functions. I highly recommend following the wiring from the connector on your trailer and testing them for function to verify this. We do not have any 5-Way connectors available with a...
    view full answer...
    Image 1 for
  • 5-Way Recommendation for Trailer for Installing Reverse Lights
    What's great about 4-way flats and 5-way flats is that they can fit each other without the need for an adapter. So what would be your best option is to use the part # HM47570 in the 7-way of your truck and then add a 5-way part # W002290 to your trailer. Basically you would want to cut off the 4-way wires short and then leave the 5th reverse light wire long to run it back to the reverse lights. The remaining wires would wire directly to the 4-way wires the trailer currently has.
    view full answer...
  • Boat Trailer Wiring With 7-Wires Coming From 5-Way Flat Trailer Connector
    The Wesbar 5-Pole Flat Connector # W002290 is our closest harness to what currently have. The newer harnesses we have will only have a short ground wire and your harness likely has a separate ground white wire that runs down each side of the trailer like the brown running lights wire on this harness. You can use this harness but will have to ground your lights on the trailer frame and allow the trailer to complete the ground circuit. If you are only needing to replace the end connector...
    view full answer...
  • Installing 5-Way Connector on 2005 GMC Envoy
    If your 2005 GMC Envoy is equipped with the factory US round car connector under the bumper (this is likely what your existing 4-Way is plugged into) the Curt T-Connector Wiring Harness # C56515 you referenced will work perfectly to replace it with a fully-functional 5-Way. The reverse circuit pin will be activated upon installation so that it will power the trailer's reverse signal lights. If you don't have this plug on the Envoy and your existing 4-Way is installed in another manner...
    view full answer...
  • Could the Harness of the Aero Pro LED Trailer Light Kit TLL36RK have a 5-Way Installed on It
    Since the fifth circuit wouldn't need to run to the lights of the part # TLL36RK you could cut the 4-way off of the harness and install a 5-way like part # W002290 to it while leaving the blue wire long and you would essentially have what you are looking for. The blue wire would then run to a reverse light or reverse lock out solenoid.
    view full answer...
  • Wire Gauge Size of the 40 Ft 5-Way Trailer Wiring Harness A40W5B
    The 40 Ft 5-Way Trailer Wiring Harness part # A40W5B uses 20 gauge wire according to Optronics. This is pretty standard and will work for the vast majority of trailers without issue.The Wesbar 5-Pole Flat Connector part # W002290 uses larger 16 gauge wire if that is what you are looking for.
    view full answer...

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Info for this part was:

Employee Mike L
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