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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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$13.10
Custom Fit Vehicle Wiring
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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. 1-800-940-8924 to order Hopkins custom fit vehicle wiring part number HM37908 or order online at etrailer.com. Free expert support on all Hopkins products. Great prices and Fastest Shipping for Hopkins Wiring Harness with 5-Pole Flat Trailer Connector - Vehicle End - 5' Long. Custom Fit Vehicle Wiring reviews from real customers.
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  • Reviews (15)
  • Q & A (0)
  • Videos (2)
  • Photos

Hopkins Custom Fit Vehicle Wiring - HM37908

  • 5 Flat
  • Universal Fit
  • Trailer Hitch Wiring
  • Vehicle End Connector
  • Splice-In
  • Hopkins
  • Plug and Lead
  • No Converter

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"




California residents: click here


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:

Ratings & Reviews

4.9

15 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:

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



by:

Great Prices and Fast Shipping



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:

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.



by:

Great product. Just what I needed.



by:

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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See what our Experts say about this Hopkins Custom Fit Vehicle Wiring

  • 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.
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  • 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...
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  • 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.
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  • 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...
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  • 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...
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  • 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...
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  • 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...
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  • Will the Curt 5-Way Mounting Bracket Work w/ the Hopkins Ergonomic 5-Way Flat?
    No, I am sorry it will not Keith. The Curt Mounting Bracket for 5-Way Flat Trailer Connector item # C58303 is designed for a standard 5-flat connector like item # HM37908. The grips and the cover on item # HM47890 aren't going to fit inside the space on that bracket. Instead you'll want to use the Curt Easy Mount Bracket for 4- or 5-Way Flat Trailer Connector item # C58001. This one mounts to your hitch receiver and sandwiches the connector into place so it'll have plenty of room. What...
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  • 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...
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  • 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...
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  • 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 taillights on the vehicle. You can use a circuit tester like # PTW2993 if needed to make sure the center pin provides power when the vehicle is put in reverse. Then plug in the adapter you have and make sure that the pin that corresponds to...
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  • 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 for...
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  • 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...
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  • 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 so...
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    Image 1 for
  • 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,...
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    Image 1 for
  • 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 # PTW2993 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 taillights at the connector on your vehicle, then you know the issue is not with the vehicle wiring....
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  • 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...
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  • 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 the...
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  • 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...
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  • Towing a Motorcycle Trailer with Separate Brake Lights and Turn Signals with a 2013 Ford Focus
    The issue is that motorcycles and the trailers made for them usually have separate turn signal and brake light circuits. But on trailers towed by passenger vehicles, the turn signal and brake lights are combined. Basically, you will have to make an adapter. You will need 3 important parts. First you will need a vehicle to vehicle converter # 118158. Next, a trailer side 4-Way, # 18004. And finally, a vehicle side 5-Way, # HM37908. It will be assembled like in the picture I have provided...
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    Image 1 for
  • Attaching Blue Wire to Reverse Light Circuit for 5 Pole Connector on 2009 Honda Pilot
    It sounds to me like you are converting a 4-way flat connector on your 2009 Honda Pilot to a 5-way flat connector like part # HM37908 in order to tow your tandem trailer with a 5 way connector. If this is the case, the extra blue wire (used for reverse lockout on coupler) coming off of the new connector will just need to be spliced into the reverse light circuit on the Pilot. In most cases you can tap into this circuit right behind your tail lights. You'll want to use a circuit tester like...
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  • 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 is...
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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...
  • 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...


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Do you have a question about this Custom Fit Vehicle Wiring?


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 Wilson B
Updated by:
Wilson B
Employee Alexander C
Written by:
Alexander C

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