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5-Flat Vehicle End 72" Wiring Harness

5-Flat Vehicle End 72" Wiring Harness

Item # 20016
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5-Flat Vehicle End 72" Wiring Harness Plug and Lead 20016
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The 5 way flat trailer connector is most commonly found on boat trailers that have hydraulic brakes. The fifth wire is hooked up to the reverse light circuit on the vehicle which then sends a signal to the hydraulic coupler to disengage the trailer brak es. Lowest Prices for the best wiring from Wesbar. 5-Flat Vehicle End 72" Wiring Harness part number 20016 can be ordered online at etrailer.com or call 800-298-8924 for expert service.
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Wesbar Wiring - 20016

  • Trailer Connectors
  • Vehicle End Connector
  • 5 Flat
  • Plug and Lead
  • Wesbar
  • 6 - 10 Feet Long

The 5 way flat trailer connector is most commonly found on boat trailers that have hydraulic brakes. The fifth wire is hooked up to the reverse light circuit on the vehicle which then sends a signal to the hydraulic coupler to disengage the trailer brak es.


5-Flat electrical wiring connector

Fifth wire added for surge brake lockout circuit which is becoming more common on today's newer boat trailers.

5-Flat wiring Connector will still work with most 4-pole trailer connectors.



118016 5-Flat Vehicle End 72" Wiring Harness




California residents: click here


Video of 5-Flat Vehicle End 72" Wiring Harness

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




Video Transcript for Wesbar Wiring - Trailer Connectors - 20016 Review

Today, we're going to review part number 20016. This is the Wesbar 5-Flat Vehicle End 72 inch Wiring Harness. This harness can be used if you have a damaged 5-way on your vehicle or if you need to install a 5-way on the vehicle. Basically, a 5-way is usually on boat trailers that have hydraulic brakes. Basically, this extra blue 5th wire right here is hooked up to the reverse light circuit on the vehicle and then that sends a signal to the hydraulic coupler to disengage the brakes when you go into reverse. This 5-way flat connector will work with 4-ways also. Basically what you'll do is the center one is the ground.

You just start on this end, plug your 4-way in and it just wouldn't plug into the one on the very end here, the blue one right here. You could still use this with a 4-way also. The five wires right here, the white is your ground. This is the blue, which would be connected to your reverse light circuit. The three that are attached together are basically the brown is the tail lights, the yellow is the left turn and brake, and the green is the right turn and brake signal. Again, the length on this is 72 inches. That should do it for the review on part number 20016.

This is the Wesbar 5-Flat Vehicle End 72 inch Wiring Harness. .


Customer Reviews

5-Flat Vehicle End 72" Wiring Harness - 20016

Average Customer Rating:  4.8 out of 5 stars   (25 Customer Reviews)

The 5 way flat trailer connector is most commonly found on boat trailers that have hydraulic brakes. The fifth wire is hooked up to the reverse light circuit on the vehicle which then sends a signal to the hydraulic coupler to disengage the trailer brak es.

- 20016
by:

This 5-way connector works great. 617763



- 20016
by:

Kind of disappointed in this wiring kit,. The wire gauge is very small, I had perchased a second wire kit from the discount hardware store made by Kenway but ordered this one thinking it would be better, it was not. The wire including the insulation on your kit is about the same size as the conductor with no insulation on the Kenway's. I will not be ordering wiring kits from here again. 612327



- 20016
by:

Have not tried yet just got it lastnight 577394



- 20016
by:

I needed a plug to adapt from a 4 pin wire + a loose wire to a 5 pin connector. worked like a charm. 496554



- 20016
by:

This was the connector that I needed for my Goldwing to connect to my Cargo trailer. 441338



- 20016
by:

Very good quality! 383799



- 20016
by:

I re-wired my boat trailer and up-dated my lights with these things.. great products worked better than I thought ! 344470



- 20016
by:

Just what I was looking for at a good p rice. 342476



- 20016
by:

I purchased this set to rewire my race car trailer and add reverse lights to the pigtail... wiring went flawlessly and there was plenty of wire and connectors are good quality... even had a dog chew on the trailer end and other than a slight ground issue, works perfectly. 339405



- 20016
by:

Works great, exactly what I needed. 327003



- 20016
by:

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. 313883



- 20016
by:

Don't know WHY this type of plug in IS so hard to find anywhere BUT HERE !!!!!!!!!!!!!! This place ( etrailer.com) has WHATEVER ( almost ) one is UNABLE to find anywhere else ! Great selection of parts, great customer service, UNLIKE other places, that don't know the products they sell....VERY affordable prices, most times lower than OTHER places !!!!!!!!!!!!! Videos that take you step by step AND the graphic diagrams ! The people here ALWAYS have time to talk / explain to you on the phone how to solve a problem OR recommend a part you may NEED ! THIS company is UNLIKE any other, they are THE BEST from products to helping you out ! THANK YOU ALLLLLLLLLLLLL 310004


Comments
Haven’t installed it yet
Jeff B - 10/23/2017

29713

- 20016
by:

Top of the line product as is everything etrailer sells. 283475



- 20016
by:

Item delivered very quick. I will purchase again from these guys. 258957


Comments
Light bar working great. No issues.....
Mike V - 06/08/2017

24819

- 20016
by:

etrailer.com make this installation easy as 1 2 3. 226228



- 20016
by:

Very satisfied with this wiring harness. Needed to upgrade the old 4 pin harness on my 2007 Toyota FJ Cruiser. I need a 5 pin harness for my boat trailer, and the original 4 pin was corroded. I also ordered the bracket for this harness, Item # tr20046, which worked great with this harness. You will also need to order a cover for this harness as it does not come with the protective cover. 210075



- 20016
by:

Well made product and works great and fits as it should. I would tell anyone that they have quality products and excellent customer service . I have found a place for all my trailer needs, James DuBois 190223



- 20016
by:

Parts ordered were as advertised and received timely. 184057



- 20016
by:

Great stuff, good prices and one-stop shopping. I tried to source all of these items locally but was unsuccessful. Thanks! 147525



- 20016
by:

Quick shipping, good product 144842



- 20016
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As ordered quick shipping 131473



- 20016
by:

Great!!! 128392



- 20016
by:

Great Service, Great Communication, Fast Delivery - will purchase again!!! 121150



- 20016
by:

I just bought my first boat trailer that had hydraulic brakes, and I didn't know how to 'make' them release when going in reverse. The dealer said I had to remember to flip a lever on the trailer-tongue each time, which would have been a hassle! Then I found this product. It wires into my truck reverse-lights so that whenever I need to back up, the 5th wire (blue one) will automatically energize a solenoid on the trailer and release the trailer brakes. Yippeee! A great product, good customer service, and FAST shipping! 104675



- 20016
by:

Good product. Does the job. 81200


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Ask the Experts about this Wesbar Wiring

  • Connecting Harley Davidson 5 wire Harness to a 4 Flat Connector on a Trailer
    I would recommend you cut off the 5-way on your motorcycle. Wire in a tail light converter kit part # HM48895. This will convert your separate circuit tail light signal of your motorcycle to a combined circuit like what your trailer has. On Harleys the turn signal wire circuit is separate from the brake light circuit so a converter like the # HM48895 is needed to convert the signal into a combined circuit like what your trailer has. You will need a circuit tester like our part # PTW2993...
    view full answer...
  • Installing a 5-Way Flat Trailer Connector on a 2005 Toyota Tacoma
    The easiest thing to do would be to install Tow Ready Custom Fit Vehicle Wiring, # 118393, first. There is no splicing involved with this installation. The T-connectors plug in line with the tail light wiring. I have included a link to the installation details and a video showing a typical installation. After the harness is installed, you can install the 5-Flat Vehicle End, # 20016. What you will need to do is cut off the 4-Way connector from the harness that was installed then splice...
    view full answer...
  • How to Determine Wiring Functions on Vehicle and Trailer
    First, you would need to determine the function of each of the wires on the vehicle side of the connector by using a circuit tester like part # 40376. Typically, vehicle manufacturers use specific colored wires for certain functions, but you would have to test to make certain, as the color codes are not always reliable. You would then need to find out what function each of the wires on the trailer are. You could run a separate 12 volt battery to test the trailer lights. You would furnish...
    view full answer...
  • Trailer Wiring Diagram for 4-Way, 5-way, 6-Way and 7-Way Trialer Connectors
    A link to the trailer wiring you are asking about is provided, just scroll down the page to select the connector you have on your vehicle and trailer. The wires on the 5 pole flat are as follows White/ground, Brown/taillights, Yellow/left turn and stop, Green/right turn and stop and Blue/reverse lockout. The brown will run to both sides of the trailer and the yellow and green will only go to the respective side they are needed on. The Blue wire goes to the electric lockout solenoid...
    view full answer...
  • Towing Motorcycle Trailer with 5-Wire Lighting System with Vehicle with 5-Pole Connector
    There are two good ways to accomplish this. You can convert the motorcycle trailer and the motorcycle to a combined system that uses the same light for the brake light and turn signals. The rear lamp assemblies would need to be replaced, and put a converter like part # 119178 on the motorcycle. This way, the trailer can easily be towed by the bike and the vehicle. The other method (which I would recommend) would involve constructing an adapter using the Vehicle to Vehicle Tail Light...
    view full answer...
  • Can Trailer be Wired for Backup Lights Using 5-Way Plug and then Converted to 7-Way
    Yes, you could wire your trailer to have backup lights by using a 5-way flat like the Hopkins Endurance Trailer Connector, # HM47910, and then use an adapter like the 7 Pole to 5 Pole Flat Wired Adapter, # A57WB, to be able to plug in to your vehicle's 7-way. Although wiring the 5-way connector for backup lights and then converting to the 7-way will work, this will require more parts than what is necessary. I recommend just wiring in a 7-way connector like the Pollak Black Plastic, 7-Pole,...
    view full answer...
  • Connecting a 5-Pin Trailer Wiring Harness for Motorcycle to a Trailer with 4-Way Flat Plug
    The Hopkins Tail Light Converter Kit with 4-Way Flat Connector # HM48895 will work as long as you do not mind having a 4-way connection on your motorcycle. You will have to remove the 5-pin connector and wire the converter on the motorcycle to reduce its 5 wire system to a 4 wire system. Your trailer should be wired as follows: White wire = ground brown = tail light yellow = left turn and brake green = right turn and brake Attach the white ground wire to a suitable ground on...
    view full answer...
  • Trailer Wiring Harness for a 2007 Jeep Grand Cherokee Laredo
    Wire color used for the tail lights on any given vehicle is not always the same within the same model year of the same vehicle. Based on that you would have to test the wiring with a circuit tester like # 3808 if needed to find the function of the wiring. But it is unnecessary for your vehicle. You need a wiring harness specifically made for a 2007 Jeep Grand Cherokee. You can use # 118425. It takes all of the guess work out and you will not have to test wiring or splice into the vehicle...
    view full answer...
  • What are the Functions of Trailer Light Green, Yellow, and Brown Wires
    Normally, the green wire on the right side carries right turn signal and brake light functions and the brown wire carries running light functions. On the left side, the yellow wire carries left turn and brake lights and the brown wire again carries the running lights. With only 2 wires, these lights must ground through the mounting studs. Make sure to wire in the new lights by function to the existing trailer wiring and not by color.
    view full answer...
  • How to Make a Quick-Disconnect Tail Light Converter For A Motorcycle Trailer Pulled by a Jeep
    There is a way for you to be able to pull your trailer with both your 2003 Honda Goldwing GL1800 and your 1997 Jeep Wrangler. The first thing that is going on between these two vehicles is that the trailer is wired for a separate turn signal system where the brake lights and blinkers are on separate bulbs, whereas your Wrangler is wired to pull a trailer that uses a combined circuit where the blinkers and brake lights are on the same bulb. There is a converter that will allow you to...
    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...
    view full answer...
  • Does Brown on Trailer Wiring Indicate Running Light Circuit
    Most likely the trailer light wiring you have on your trailer that have brown on them are for the running light circuit and the ones with red are for stop/turn circuits. Your best option is to test the wires with a circuit tester like part # 3808 while a buddy applies the trailer light functions and then wire your trailer accordingly.
    view full answer...
  • Troubleshooting Taillights with a 7-5-way Adapter on an Audi Q7
    The issue you are having is not a 4-5 way adapter issue. If everything was working correctly using a 4-way on a 5-way connector would work just fine. I would first just try pulling the adapter out and re-installing it just to see if maybe something is making good contact. If that does not fix it you will need to use a circuit tester like our part # PTW2993 to test for voltage first at the back of the 7-way on your Audi Q7. If there is voltage going into the connector but not out of it...
    view full answer...
  • Electric Reverse Lockout is Not Working on a Boat Trailer
    First, make sure that your trailer has an electric reverse lockout and that the 5th wire is connected to it and not something else. Then, on the vehicle side, check that the center pin wire is connected to a reverse light circuit behind one of the tail lights on the vehicle. You can use a circuit tester like # 40376 if needed to make sure the center pin provides power when the vehicle is put in reverse. Then plug in the adpater you have and make sure that the pin that corresponds to...
    view full answer...
  • Towing a Motorcycle Trailer with 4-Way Square Connector with RAV4 with 4-Way Flat Connector
    If you want to be able to tow the trailer with the RAV4 and with the motorcycle you are going to have to wire in a second connector on the trailer to match the 4-Way flat on the RAV4. The issue is that trailers designed to tow with motorcycles will likely have turn signals separate from the brake lights. The 4-Way flat on your RAV4 has combined turn signals and brake lights. This will require a special converter, # 118158, to maintain the separate circuits on the trailer. First,...
    view full answer...
  • Tips for Identifying 4-Way Wiring Colors that Use Non-Standard Colors
    Your Dakota uses non-standard wire colors for the 4-way so your best option is going to be to test all of the the wires while applying the various taillight functions of your vehicle to verify you have the correct function of them all. For that you'd want a circuit tester like # PTW2993. I attached a video link to this page that shows how to do this as well. That said. MOST LIKELY the black wire is the ground since you said it's thicker than the other wires.
    view full answer...
  • Troubleshooting Why Trailer Lights Go Out When You Hit the Brakes
    It sounds to me like you may have a ground problem. There are several places to look for a poor ground connection. I recommend starting with the trailer connector on the trailer. Check to make sure that the ground wire is secured to a clean metal surface on the trailer. In addition, each lamp/signal will also need to be grounded. Typically the lamp/signal is grounded through the mounting bolts having direct contact with the trailer frame. If the area that the lights are mounted to...
    view full answer...
  • Troubleshooting Dim Trailer Lights on Boat Trailer When Head Lights Are On
    The problem is either that you have a bad ground or the charging system or your truck is just at it's capacity from having every light activated on the vehicle. Most likely it is the trailer ground though. Since a lot of trailers will actually ground through the coupler of the trailer to the hitch ball, and then to the vehicle's hitch frame, trailer lights will still typically function with the ground strap removed of the trailer connector. What I would recommend you try next is run...
    view full answer...
  • Replacing 4-Way Female to 5-Way Male Wiring Loop
    I do have a solution for you, however the female 4-Way to male 5-Way loop that you have is no longer available. Instead of using another adapter like this one your best option will be to actually cut off the 4-Way connector from the trailer and splice in a 5-Way like the Hopkins # HM47913 in its place. The blue wire from the 5-Way will go to the blue wire that you mentioned coming from the actuator. With this in place on the trailer you will be able to connect directly to the 5-Way on the...
    view full answer...
  • Trailer Lights Only Work with Camper Plugged In To Shore Power
    It sounds like the trailer lights are tied into the interior lights and the trailer mounted battery and inverter. What I recommend is to have the trailer exterior lights bypass the rest of the wiring so that the trailer connector is isolated from the other lights. It seems that if everything is connected together through the battery or the inverter, including the trailer connector. Replacing the battery could solve the issue but I would still have the trailer connector separate from...
    view full answer...
  • Converting 2009 Toyota Tacoma Factory 4-Way Connector to a 5-Way Connector
    The easiest thing to use would be adapter part # 20036. It provides the extra wire for reverse lights to be run separately from the vehicle 4-Way flat. You could also re-wire the current 4-Way connector with a new standard 5-Way using part # 20016. You could match the wires as they currently are, and run the blue wire to the reverse light cricuit and splice in using a quick splice connector, part # SWC502905-1.
    view full answer...
  • Parking Lights Do Not Work When Using a 7-Way to 4-Way Adapter with a 2008 Chevrolet 1500
    If you are seeing a TM on your trailer connector or on the 7-way to 4-way adapter, then the TM means tail/marker lights, or the parking lights, you are referring to. The first step that I would take is to get a circuit tester like part # 40376 and test each pin or blade on the connector on your 2008 Chevrolet 1500 to make sure it is functioning properly. If you have a signal for the tail lights at the connector on your vehicle, then you know the issue is not with the vehicle wiring....
    view full answer...
  • Adapter Needed to Converter Motorcycle Trailer with 5-Way to 4-Way
    Yes, the converter you'd need is the part # 118158. This is designed to take combined circuits like you have on you motorcycle (referring to stop and turn being carried on same circuit) and separates them out so that you have a stoplight circuit on it's own wire. You'd want to install this on your trailer's wiring and you'd be set.
    view full answer...
  • Which Circuit Runs to Blue Wire of Trailer Wiring
    Your trailer wire that is blue would be for the trailer brakes so the truck blue wire that is labeled electric brakes would be the correct one to use. Not every trailer has the need for a reverse light circuit.
    view full answer...
  • Towing Motorcycle Trailer w/ 5-pin Trailer Connector Using Vehicle with 4-Pin Flat Trailer Connector
    A co-worker and I cobbled something together a few years ago that we called the Frankenadapter. It would consist of the # 118158 Vehicle to Vehicle Taillight Converter, a 4-pole trailer-side connector like # HM38168 and a 5 pin round vehicle side connector like # PK11502. The adapter would be constructed as shown in the provided photo. The 5 pin connector would connect to the wires shown to the right. The adapter will separate the stop lamp signal from the right and left turn signals...
    view full answer...
  • Left Turn Signal Blinks on Trailer When Right Turn Signal is Activated on a 1997 Ford E-150
    I have attached a diagram of typical trailer wiring for you to check out as well as an article on trailer wiring that you may find helpful when troubleshooting this issue. Unfortunately, I do not have a wiring diagram for your 1997 Ford E-150 conversion van. It is important that you determine the function of each wire by testing them with a circuit tester like part # 40376 and not relying on the color of the wire. If the wiring on the trailer or vehicle wiring harness was modified at any...
    view full answer...
  • Installing 5 Way Connector for Reverse Trailer Brake Lockout on 2002 Escape w/Ground Side Switching
    Your vehicle has a ground side switching reverse light circuit. You can use the 5-Flat Vehicle End 72 Wiring Harness, item # 20016, on your vehicle to install all of the connections from your original 4-Way connector and then wire the reverse light circuit. For your ground side switching reverse light circuit you will need a relay. These relays are called ISO relays and are available at your local auto parts dealer. The relay will have 5 terminals. One terminal on the relay will require...
    view full answer...
  • Parts Needed to Convert a Separate Tail Light Signal of a Honda Goldwing to Combined for Towing
    It sounds like the adapter you used dropped the brake light circuit when it went from a 5-way to a 4-way. Normally on a 4-way the brake light circuit is on the turn signal circuit. Motorcycles usually have a separate wire/circuit for just the brake lights separate from the turn signals so I believe that is where your problem is from. I believe I have a solution for you, but not with using the adapter you have. I would recommend you cut off the 5-way on your motorcycle. Wire in a tail...
    view full answer...
  • Should Trailer Running Light Circuit Run to Both Taillight Assemblies on a Trailer
    Most likely yes. The brown wire coming from the vehicle should be the running light circuit like you mentioned and the running light circuit of your trailer will most likely be a brown wire that also runs to the taillight housing on the trailer. The brown wire will need to go to both sides of the trailer's taillights to carry this circuit to both lights.
    view full answer...

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Info for this part was:

Expert Research:
Mike L
Expert Research:
Robert G
Expert Research:
Michael H
Expert Research:
Reno H
Expert Research:
Jameson C
Expert Research:
John H
Expert Research:
Jeffrey L
Updated by:
Brian T

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