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Hopkins Wiring Harness with 5-Pole Flat Trailer Connector - Vehicle End - 5' Long

Hopkins Wiring Harness with 5-Pole Flat Trailer Connector - Vehicle End - 5' Long

Item # HM37908
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Wire your vehicle to tow a trailer with this universal, splice-in wiring harness. Provides reverse function to release surge brakes. Corrosion-resistant terminals are long-lasting. Lowest Prices for the best trailer wiring from Hopkins. Hopkins Wiring Harness with 5-Pole Flat Trailer Connector - Vehicle End - 5' Long part number HM37908 can be ordered online at or call 1-800-940-8924 for expert service.
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  • Reviews (8)
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Hopkins Trailer Wiring - HM37908

  • Trailer Connectors
  • Vehicle End Connector
  • 5 Flat
  • Plug and Lead
  • 0 - 5 Feet Long
  • Hopkins

Wire your vehicle to tow a trailer with this universal, splice-in wiring harness. Provides reverse function to release surge brakes. Corrosion-resistant terminals are long-lasting.


  • 5-Way flat trailer connector at the back of your vehicle plugs into the connector from your trailer to power your trailer's signal lights
    • Includes reverse function to release brakes when backing up
    • Ideal for use with marine-type trailers equipped with surge brakes
  • Simple installation
    • Hardwire to existing trailer wiring
  • Corrosion-resistant terminals are long-lasting


  • Harness length: 5'
  • Wiring configuration:
    • White: ground wire
    • Yellow: left turn/brake light
    • Green: right turn/brake light
    • Brown: tail lights
    • Blue: reverse lights
  • 90-Day limited warranty

37908 Hopkins 5-Way Flat Connector - Vehicle End - 60"

Video of Hopkins Wiring Harness with 5-Pole Flat Trailer Connector - Vehicle End - 5' Long

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

Video Transcript for Hopkins Wiring - Trailer Connectors - HM37908 Review

Today we're going to be taking a look at the Hopkins Wiring Harness, with a 5-pole flat vehicle end trailer connector. This connector would be located at the back of the vehicle, and it would plug into the connector from your trailer to power your trailer signal lights. It does include the reverse functions to release the brakes when backing up, so it's ideal for use with marine-type trailers equipped with surge brakes. Pretty simple installation. You just hard-wire it to the existing wiring on the vehicle. This one features corrosion-resistant terminals that are long lasting.

It's got the grip areas on the top and bottom that allow for a nice easy grip design, and this 5-pole flat vehicle end connector will work with most 4-way flat connectors. Now the harness length, I have it all bundled up, but overall it's going to measure about 5 feet long. When it comes to the wiring configuration, your white wire is your ground wire. Yellow wire is going to be for your left turn and brake. Green is for the right turn and brake. Brown is going to be for your tail lights, and then blue is going to be for your reverse lights. Now the 5-way design will also work with small utility trailers that have electric brakes.

For this type of application, the fifth wire, which would be the blue one, will need to be wired to correspond with your end cab electric brake controller. That's going to do it for today's look at the Hopkins Wiring Harness with the 5-pole flat vehicle end trailer connector.

Customer Reviews

Hopkins Wiring Harness with 5-Pole Flat Trailer Connector - Vehicle End - 5' Long - HM37908

Average Customer Rating:  4.8 out of 5 stars   (8 Customer Reviews)

Wire your vehicle to tow a trailer with this universal, splice-in wiring harness. Provides reverse function to release surge brakes. Corrosion-resistant terminals are long-lasting.


The product was good, but it took 45 days to get it.


Just what I wanted. No frills straightforward ready to install. Good value and quality.


Thank you for shipping it out fast. Plan to use it for my motorcycle.


Haven't used it yet but pretty straight forward.


The Glolight LED trailer set is the perfect replacement for my tow dolly. It is light weight and much more visible than the standard bulb lamp set the trailer was equipped with. Installation was quick and very easy, I will recommend this to all needing to change theirs out...


Good product. Would be even better if wire was tinned copper


Great product. Just what I needed.



Ask the Experts about this Hopkins Trailer Wiring

  • Subaru with 5-Way Flat Trailer Connector to Trailer with 4-way
    If your Subaru already has a 5-pole flat trailer connector like the Hopkins # HM37908, you will not need any additional parts to be able to connect with the 4-way flat on your trailer. You will just simply connect the two harnesses, and the additional pin on the Subaru's 5-way will just not be used.
    view full answer...
  • Connecting 4-Way on Motorcycle to 5-Way on Trailer
    I think what might be going on here is that your trailer uses separate wiring (which is what a motorcycle would typically use as well) but your motorcycle has combined wiring, or at least is equipped with a converter to combine it before the connector, which is why it's equipped with a 4-Way instead of a 5-Way. With a combined wiring setup the turn and brake signals on each side of the motorcycle are sent along the same circuit. This is why the lights aren't working correctly on the trailer...
    view full answer...
  • Solution to Activate Reverse Lockout Solenoid of Surge Brake Trailer Being Towed with Front Hitch
    This is a really good question. Probably the best solution would be to wire a 5-way to the front of your truck like with the part # HM37908. Run the blue wire to your positive battery post and then the white to the ground and whenever it's plugged into your trailer the reverse lock out solenoid will activate and allow the trailer to move.
    view full answer...
  • Towing a Trailer with a 4-Way Trailer Connector with a Vehicle that has a 5-Way Connector
    It sounds like you're trying to tow a trailer that has a 4-way connector, like part # HM38168, with a vehicle that has a 5-way connector, like part # HM37908. If this is the case you don't need any additional parts or a converter. A 4-way and 5-way will plug into each other you just won't have the 5th pin connected. Nor will you have the function that's carried on that pin. If this isn't what you're trying to do then let me know your exact set up so I can be more help.
    view full answer...
  • 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.
    view full answer...
  • Shortest 5-Way Flat Vehicle and Trailer Side Connectors
    The shortest pre-made 5-Way flat vehicle side connector that we have is 48 inches long, # HM47900. If you need the trailer side instead we have # HM47910 or # HM37918 which are 18 inches long.
    view full answer...
  • How to Add 5-Way Wiring Harness to a 2012 Ford Edge
    We do have some options for you to add a 5-Way wiring connector on your 2012 Ford Edge, but the available wiring kits that tee in behind the tail lights don't come with 5-Way connectors. Your options to adding a 5-Way include using a wiring kit like the T-One # 118515 and then cutting off the 4-Way and splicing in a 5-Way like the Hopkins # HM37908, OR you can just install a 5-Way harness that splices in completely like the Tekonsha # 119177. Attached are some videos you can check out...
    view full answer...
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  • What Type of Trailer Wiring Does Boat Trailer Typically Have
    Boat trailer 4-way trailer wiring is done in the same way as other 4-way trailer wiring. Sometimes boat trailer will use 5-ways instead if the trailer has surge brakes and the actuator has a reverse lockout which allows the trailer to back up without brake application. For that we have the part # HM37908 which comes with a 5 foot harness.
    view full answer...
  • Recommended 5-Pole Flat Trailer Connector To Replace Damaged Connector
    If the 5-way connector you have is installed on the vehicle you can use part # HM37908. You would just cut the connector off of your vehicle and splice the # HM37908 with the length of wire you need. You can use butt connectors like part # DW05744-5 to connect the wiring. If the connector is on the trailer then you can replace the damaged connector with part # HM47910.
    view full answer...
  • Troubleshooting New Wiring Harness On Trailer For Reverse Lights
    In order to get the reverse lights to work on your trailer you will need a 5-way on your vehicle and also on your trailer. It sounds like you have wired the 4-way up but now you need the reverse lights. I recommend removing the 4-way connectors on both the towing vehicle and on your trailer and installing 5-way connectors. For the trailer side I recommend part # HM47913. You would attach the white, yellow(or light green), green, and brown wires to the same color on your trailer and then...
    view full answer...
  • Wiring 5-Flat Connectors on Jeep and Trailer
    It sounds like your trailer has a 4-flat wishbone connector, which will have 5 wires with two of them going to the tail light wires. If your trailer has brakes you will need to wire a 5-flat # HM37908 on your Jeep. For this harness, the white wire is the ground wire, the yellow is left turn/brake light, the green is right turn/brake light, the brown is tail lights and the blue is reverse lights. Your trailer will also need a 5-flat # A40W5B, which has a blue wire which disengages the surge...
    view full answer...
  • Replacement 5-Way Flat Trailer Connector Recommendation
    The 25 Ft 5-Way Trailer Wiring Harness part # A25W5B will do the trick for you. It is a bit longer than you need but the 4 male and 1 female plug is usually found on the trailer and not the truck causing the long harness issue. Typically you find this on the the vehicle side of things. Hopkins Wiring Harness with 5-Pole Flat Trailer Connector - Vehicle End - 5' Long part # HM37908 this would meet your requirements but you would have to change the trailer side to the harness listed above...
    view full answer...
  • Wiring for 2008 Toyota Tundra Towing Surge-Coupler Equipped Boat Trailer With 5 Pole Connector
    A brake controller like the Tekonsha # 90885 P2 is for use with electric brakes, not surge brakes like what your trailer is equipped with, so you wouldn't need a brake controller. A surge coupler will compress when the tow vehicle applies its brakes. This compression is what applies the hydraulic trailer brakes and is in effect, just like stepping on a brake pedal. The 5th wire on your trailer connector is for a reverse lockout solenoid which prevents the brakes from actuating when you...
    view full answer...
  • Adding 5-Way With 25 Feet of Wire to Back of Trailer For Lights on Cargo Carrier
    So I think we have a solution here for you, but there isn't a vehicle-end 5-way that has 25 feet of wire, so you'll need to splice in additional wire. As for using the blue wire, that is the reverse light wire on the 5-way, so you would need that since you want to utilize a reverse light. Here is what you would need: - Hopkins Wiring Harness with 5-Pole Flat Trailer Connector - Vehicle End - 5' Long # HM37908 - Primary Wire - 16-Gauge - White - per Foot # DW02359-1 - Deka Heat Shrink...
    view full answer...
  • 7-Way to 6-Pole Trailer Connector Adapter for Horse Trailers
    Most horse trailers have a 6-pole trailer connector. In order to attach the 6-pole trailer connector to your vehicle then you will want to use the Hopkins Heavy-Duty, Coiled Trailer Connector Adapter part # HM47083 if the center pin on your vehicle connector is for 12v power or part # HM47085 if the center pin on your vehicle connector is for the brake circuit. You will need a 7-way connector on your vehicle in order to activate the trailer brakes on your horse trailer. If you do not...
    view full answer...
  • Recommended 14 5-Way Flat Connector Harness With Protective Coating
    I may have an option for you but we do not sell a 14' 5-way flat connector harness that has a protective coating on it other than the wiring insulation. I recommend the 25' 5-Way Trailer Wiring Harness # A25W5B which can be cut down to 14' if you need the trailer side connector, or the longest vehicle side connector is the 5' Hopkins Wiring Harness with 5-Pole Flat Trailer Connector # HM37908 and adding Wire Loom # 7509-1 which is sold by the foot for further protection. It is also a...
    view full answer...
  • Trailer Connector for Towing Surge Coupler Equipped Trailer With 2013 Toyota Tundra
    I'll begin with the assumption that your new pontoon trailer has hydraulic surge brakes. This type of braking system uses a hydraulic coupler that compresses when the tow vehicle brakes, and the compression is what causes the brakes to actuate. A trailer like this usually uses a 5 pole flat trailer connector, with the extra circuit being the reverse lock out. The reverse lock utilizes a solenoid that prevents the brakes from applying with you attempt to back the trailer. Otherwise, especially...
    view full answer...

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Info for this part was:

Employee Lindsey S
Edited by:
Lindsey S
Employee Michael H
Expert Research:
Michael H
Employee Jameson C
Expert Research:
Jameson C
Employee Joshua S
Video by:
Joshua S
Employee Cole B
Installed by:
Cole B
Employee Ryan G
Installed by:
Ryan G
Employee Alexander C
Written by:
Alexander C

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