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

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

Part Number: HM37908
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$13.14
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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. Great 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 etrailer.com or call 1-800-940-8924 for expert service.
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  • Reviews (15)
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  • Videos (2)
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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.


Features:

  • 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


Specs:

  • 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 In-Depth Review of the Hopkins Wiring Harness with 5-Pole Flat Trailer Connector

Hey, everybody. Ryan here at etrailer. Today, we're gonna be checking out the Hopkins 5-way flat trailer connector for your vehicle side. For those of you that are unfamiliar with a five-way flat, this is essentially identical to kind of your classic four-way flat type connector. I'm sure a lot of people have seen them. They're just on about a ton of different medium size, smaller size trailers.

But this being the five-way though, you get one extra signal and that will be your reverse light signal. So, we have our ground wire, our taillight signal, our left turn as well as stop, right turn and stop, and this blue one is our reverse light. Now, there's a couple of different reasons you would wanna use this. I'd say probably the most common is for when you're towing a boat that has surge brakes on it. That way, when you're going to launch the boat or just even back it up into the garage or whatever, it'll have this reverse light signal and it won't lock the brakes up.

That way, you can actually back it up and not, you know, drag it across the ground. But you can kind of get creative too. I know there's some people that use this signal. They might have some small LED lights like as back up lights on their utility trailer and you can get a signal from this. That way, when you put it in reverse, it sends power out to whatever you have it wired up to.

So, you can kind of get creative on what you can do with this. Now, keep in mind this isn't gonna have a ton of amperage. So, you can't run a hundred lights off of it. But you got one or two lights on it, especially if they're LEDs, chances are good it's gonna power them right up and everything else. So, you know it's one of those deals that, in a sense, it's almost an upgrade over kind of your factory four-way or your regular four-way type connector.

And that kind of brings me to my next point. You are still able to use a four-way connector with this. So, let's say, if you have a boat trailer with the five-way and you also have the utility trailer with the standard four-way, you're still gonna be able to use the same connector. You won't need an adapter or anything. So, just for example, this is a trailer side, kind of your standard four-way and it'll still plug in. It'll still get its regular signals and everything else. So, like I said, you're not gonna need an adapter or anything like that. But I do want to mention, for this to work, you are going to need existing four-way wiring because this is essentially just a pigtail, right So, it's the connector and those five wires that come off of it. So, you are gonna have to kind of splice this into your existing wiring. And then, of course, you're gonna need to be able to find a way to pick up your reverse light circuit too. Whether it be your reverse light bulb, maybe your reverse light fuse in the dash or whatever, you're gonna need that power source, right So, that's just something to keep in mind whenever you're thinking about hooking this up to your vehicle. This particular harness is going to be five foot in length. So, changes are pretty good you're not gonna need all that wiring but it is good to have, right That way, if you do have to stretch it a little bit further, you got it, which kind of brings me to my next point. When installing this, it's probably a good idea, I would suggest picking up five heat shrink-type butt connectors, especially if you're gonna be keeping this outside since you have to splice in your existing four-way wiring. And it's gonna be pretty much the same for all vehicles. You splice in that four-way and then obviously, pick up your reverse light circuit, which like I mentioned earlier, you usually get it from your reverse lights, or one of your fuses, things like that. So, every vehicle is gonna be a little bit different but the idea is the same. I do wanna mention too, this isn't gonna come with a dust cover. You know how sometimes there's a little cap that'll plug over this So, that is something that you can grab separate and excuse me, you can also get, there's all different types of brackets and things of that nature where you can mount this up on your hitch. And this is even a good example. So today, I just put some of this black wire loom over our wires just to help kind of, kind of help it blend in a little bit better. So, you can use something like this as well if that's the style you're going for or the look you're going for. But other than that, at the end of the day, it's gonna be a good way to be able to use different types of accessories or pull those different types of trailers around that you otherwise wouldn't be able to. So hopefully, this kind of cleared up a few things and answered some of your questions on what this is, and what it actually does, and gets you going in the right direction. And that'll finish up our look at of the Hopkins five-way flat trailer connector for the vehicle side..

Customer Satisfaction Score:


Customer Reviews

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

Average Customer Rating:  4.9 out of 5 stars   (15 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.

by:

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...



by:

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



by:

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



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



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Great product. Just what I needed.



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



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Haven't used it yet but pretty straight forward.



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Great Prices and Fast Shipping



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15
15

See what our Experts say about this Hopkins Trailer Wiring

  • 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...
  • Wire Gauge of 5-Pole Flat Vehicle Wiring Harness and Recommended 5-Flat Trailer Side Harness
    The 5-Pole Flat Vehicle Wiring Harness # HM37908 uses 16 gauge wire.
    view full answer...
  • Adapting 4-Pole Flat on Toyota Sienna to 5-Pole Flat Using Part # 20036
    To provide the converter you already have with a 5-pole connector, you have two choices. You can use and adapter, like part # 20036. The blue wire on the adapter would tap into the circuit that feeds the reverse lights on your Sienna. A more permanent solution is available. You can cut off the 4-pole connector on the vehicle, and wire in a 5-way flat vehicle end, part # HM37908. The brown, white, yellow and green wires would match those used by your existing connector. As with the adapter...
    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...
  • 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...
  • Connecting a 5-Pin Trailer Wiring Harness for Motorcycle to a Trailer with 4-Way Flat Plug
    The Hopkins Taillight 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 = taillight yellow = left turn and brake green = right turn and brake Attach the white ground wire to a suitable ground on the motorcycle...
    view full answer...
  • Wiring a U.S.A. Boat Trailer to a 9 Wire European Trailer Plug
    The 5-Way connector on your boat will be wired as follows. Green is right turn/brake, yellow is left turn/brake, brown is running lights (both sides), white is the ground or earth connection, and the blue wire is the reverse lockout or reverse lights. I searched for a connector on the internet that matches your 9-wire connector and came up with nothing. I would recommend using a circuit tester, item # PTW2993, and wire by function only. Have a helper activate all of the various functions...
    view full answer...
  • Replacement Master Cylinder To Convert To Disc Brakes On Demco Hydraulic Brake Actuator DM8759933
    We have either the Replacement Master Cylinder # 5672 or Replacement Master Cylinder w/ Bypass Electric Lockout # DM5918 which will fit the Demco Hydraulic Brake Actuator # DM8759933. While this actuator does have the manual lockout you can install the master cylinder with electric lockout which will save you from having to get out of your vehicle to lockout the brakes. This will use a signal from the reverse circuit which if your trailer has a 4-way you will need a 5-Way # HM37908 to replace...
    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 # HM37908. You could match the wires as they currently are, and run the blue wire to the reverse light circuit and splice in using a quick splice connector, part # SWC502905-1.
    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...
  • Wiring for Toyota 2010 Highlander with a 7-Way connector for Towing
    You will need the Curt Class III Round Tube Trailer Hitch, item # 13534, and with the tow package you will need the T-One Connector Wiring Harness with 4 Pole Trailer Connector - Toyota Highlander, item # 118449. I would go ahead and install the 7-Way connector. We have the Brake Controller 7 & 4 Way Installation Kit, item # ETBC7, which includes everything needed to install the wiring for the 7-way connector, once you have the 4-Way installed. You mentioned a 5-Way connector and if you...
    view full answer...
  • Wiring Trailer Lights for 2009 Pontiac Vibe Without Using Converter
    Probably the easiest way to handle this situation would be to use a 5-way connector, part # 20017 for the trailer and part # HM37908 for the vehicle end. Use the extra wire for the brake light lead. If the trailer needs to be towed by another vehicle, simply use the 4 to 5 Way Adapter, part # 47515.
    view full answer...
  • Troubleshooting Installing Trailer Light That Has 2 Wires When Old Light Had 3
    Typically when a stop/turn signal trailer light assembly only has two wires run to it that means that it grounds through the mounting hardware of the light. What you will need to do is test the wires of your trailer for voltage with a circuit tester like part # PTW2993 to determine which wire carries which function. The extra wire of your new trailer light is most likely a ground and could be run to the mounting hardware of the light so that it will ground properly.
    view full answer...
  • Diagram for Utility and RV Style 7-Ways
    I attached a 7-way diagram picture that shows both ways normally seen how a 7-way is wired. The utility style which has the brown for taillights and the RV style that has the green for running lights. An RV would be wired like the center set of pictures.
    view full answer...
    Image 1 for
  • 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...
  • Is Hopkins Coiled Adapter 7-Way To 5-Way And 4-Way Flat, # HM47025, Available In 5 Foot Length
    The Hopkins Heavy-Duty Trailer Coiled Wire Adapter 7-Way to 5-Way and 4-Way Flat, # HM47025, is only available in a 3 feet length. I have the RoadMaster 7-Wire to 6-Wire Flexo-Coil Kit, # RM-146-7, that is 8 feet long, but you would need to remove the 6-pole plug and attach the Hopkins Wiring Harness with 5-Pole Flat Trailer Connector - Vehicle End - 5' Long Item # HM37908, to give you a 5-Flat vehicle end or the Tow Ready 4-Flat Vehicle End Harness, # 18002, to give you a 4-Flat vehicle...
    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 taillight 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, # HM37908. What you will need to do is cut off the 4-Way connector from the harness that was installed then splice...
    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...
  • Identifying Circuits on Possible Wishbone Trailer Connector
    What you are describing sounds like a wishbone harness. A wishbone harness splits the running light circuit into two wires coming directly out of the 4-pole connector.Instead of a single brown wire carrying the running light circuit, you would have a brown/green wire for running lights on the right side of the trailer and a brown/yellow wire for left side running lights. You would also have a yellow wire carrying the left turn/brake light circuit, a green wire for right turn and brake,...
    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...
  • Installing a 5-Way Flat Trailer Connector on 2005 Ford Explorer for Boat Trailer with Surge Coupler
    If your Explorer already has a 4 pole trailer connector on it, you can install a 5-pole connector. Use a 5-pole vehicle side trailer connector part # HM37908, and after cutting off your existing 4-pole, wire the green, yellow, brown and white wires of the 5-pole into the wiring harness on the vehicle. The remaining blue wire on the 5-pole would tap into the reverse lamp circuit on your Explorer. Once the transmission is placed in reverse, the reverse lamp is lit, sending a signal to lock...
    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 Converter,...
    view full answer...
    Image 1 for
  • 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...
  • Parts Needed To Add 5-Way Connector To Power Lights For Headache Rack On 2020 Ram 3500
    I have an option for you, but there is not a 5-way connector that is custom fit for your 2020 Ram 3500 and will allow to also hook up a trailer. I recommend using the Hopkins Wiring Harness with 5-Pole Flat Trailer Connector - Vehicle End - 5' Long Item # HM37908, and if it is not long enough to reach from the back of your truck to the headache rack you can add Bonded 4 Wire # 16-4B-1 and Primary Wire # 16-1-1 which are sold by the foot, to give you extra length. If you need to extend...
    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 Jacob T
Video Edited:
Jacob T
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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