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Hopkins Wiring Harness with 4-Pole Flat Trailer Connector - Trailer End - 6' Long

Hopkins Wiring Harness with 4-Pole Flat Trailer Connector - Trailer End - 6' Long

Item # HM38168
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Trailer Wiring
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Wire your trailer with this universal, splice-in wiring harness so that you can connect the trailer's wiring to your vehicle's during towing. Corrosion-resistant terminals are long-lasting. Lowest Prices for the best trailer wiring from Hopkins. Hopkins Wiring Harness with 4-Pole Flat Trailer Connector - Trailer End - 6' Long part number HM38168 can be ordered online at etrailer.com or call 800-298-1624 for expert service.
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  • Reviews (22)
  • Q & A (0)
  • Videos (1)
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  • Why etrailer?

Hopkins Trailer Wiring - HM38168

  • Trailer Connectors
  • Trailer End Connector
  • 4 Flat
  • Plug and Lead
  • 6 - 10 Feet Long
  • Hopkins

Wire your trailer with this universal, splice-in wiring harness so that you can connect the trailer's wiring to your vehicle's during towing. Corrosion-resistant terminals are long-lasting.


Features:

  • 4-Way flat trailer-end connector plugs into the 4-way flat on your vehicle
    • Compatible with 5-pole, 6-pole and 7-pole adapters (sold separately)
  • Simple installation
    • Hardwire to existing trailer wiring
  • Corrosion-resistant terminals are long-lasting


Specs:

  • Harness length: 6'
  • Wiring configuration:
    • White: ground wire
    • Yellow: left turn/brake light
    • Green: right turn/brake light
    • Brown: tail lights
  • 90-Day limited warranty


38168 Hopkins 4-Way Flat Connector - Trailer End - 72"




California residents: click here


Video of Hopkins Wiring Harness with 4-Pole Flat Trailer Connector - Trailer End - 6' 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 - HM38168 Review

Today we're going to be taking a look at the Hopkins 4-Pole Flat Wiring Extension. This wiring harness is going to simply act as an extension of your trailer's wiring. It's going to feature one trailer end connector, and then this side right here is going to wire into the trailer wiring on your trailer. On the connector plug right here, we're going to have corrosion resistant terminals. These are very long-lasting. Nice, strong durable design.

It's going to have some grips here on the connector head, gives it an easy grip design. The overall harness length is going to measure about 6 feet long, so that's 72 inches. When it comes to the wiring configuration, your green wire is going to be right turning brake. Yellow is going to be left turn and brake. Brown is going to be for your tail lights, and white is going to be for your ground wire.

That's going to do it for today's look at the 4-Pole Flat Wiring Extension.


Customer Reviews

Hopkins Wiring Harness with 4-Pole Flat Trailer Connector - Trailer End - 6' Long - HM38168

Average Customer Rating:  5.0 out of 5 stars   (22 Customer Reviews)

Wire your trailer with this universal, splice-in wiring harness so that you can connect the trailer's wiring to your vehicle's during towing. Corrosion-resistant terminals are long-lasting.

- HM38168
by:

This was the only place where I could find this trailer-side Hopkins flat 4-connector with 6' wire. It was exactly what I needed, but I couldn't find anywhere else. I've installed it as part of a total trailer rewire and it works fine. I wanted Hopkins because they use a much heavier wire. It is being used to go from truck through trailer tongue, then mating with the Hopkins 25' wire roll, on back to the lights. I've used this dealer before, and always get what I want. My complaints are how much they charge for shipping and the amount of time they took for me to receive it.


Comments
Everythings working as it should. No complaints.
JimBo - 07/27/2018



- HM38168
by:

Works great



- HM38168
by:

Well made and worked great. I needed the 6' pigtail it came with.



- HM38168
by:

Ordered a bunch of stuff for hooking up a towed. Everything arrived as ordered and quick shipping. Everything fit the application without much trouble. Communication from etrailer was excellent. I would purchase from etrailer again.


Comments
Steve G, I see by your comments that you did order a bunch of stuff!! If you should have any questions or problems please feel free to contact the etrailer customer service department. Thanks for being such a good customer.
Hopkins C from - 04/26/2017



- HM38168
by:

etrailer had the part i need which I could find no where else. Service was fast and customer service was great evidenced by an email checking that I received their product, offering installation help, and thanking me for being a customer. Pretty amazing for an online company.



- HM38168
by:

Exactly what it is supposed to be. Simple item. Nice to have choices on length. I can usually find whatever trailer part I need on Etrailer.



- HM38168
by:

As advertised. Worked well



- HM38168
by:

Great place to do business with always good products and quick shipping.



- HM38168
by:

Great people to work with. Excellent prices on all trailer parts. Thanks



- HM38168
by:

Name brand products perform as expected.



- HM38168
by:

Easy to navigate website. Easy purchase and fast shipping.



- HM38168
by:

Thank you for the product and prompt delivery..has been a pleasure doing business with you...G. In Ga.



- HM38168
by:

Exactly what I ordered and exactly what I needed!


Comments
Hopkins appreciates your business, Heidi and we are grateful you purchased our Trailer Connector. If you have any concerns or questions, please get in contact with etrailer customer service. Thank you!
Hopkins C from - 06/23/2017



- HM38168
by:

Fast and friendly service. Package arrived on time as promised. Great company!



- HM38168
by:

Good price, and it works


Comments
Thanks John b for the great review and rating!! Hopkins appreciates your business.
Hopkins C from - 07/05/2017



- HM38168
by:

Worked as expected. 6' was a little short for my purposes and I had to add a foot of wire.



- HM38168
by:

Works good fits plug snug.



- HM38168
by:

Fine



- HM38168
by:

Timely service. Product works as expec ted.



- HM38168
by:



- HM38168
by:



- HM38168
by:


22
22

Ask the Experts about this Hopkins Trailer Wiring



  • Will Hopkins Wiring Harness with 4-Pole Flat Trailer Connector Plug Into a Hopkins 4/7-Way Connector
    Yes, the Hopkins Wiring Harness with 4-Pole Flat Trailer Connector # HM38168 will plug into the 4-Way receptacle on your truck. Sometimes we see some compatibility issues with 4-Way flat connectors but it is rare and you would not have to worry about that since both this part and the 4-Way on your truck are made by Hopkins. I have included a link to a video review of the 4-Way for you.
    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...
  • Dual 4-Way Flat Connector Adapter With Two Male Ends for Flat Towing
    We have the exact part you need with the Roadmaster Extension Loop for Towed Vehicles - Dual 4-Way Flat Trailer Ends # RM-300150-00. This has two male connectors for you to plug into the harness on your Jeep Wrangler and on your RV. I have added a link to a video review of this adapter to check out as well.
    view full answer...
  • Trouble Shoot Trailer Wiring For 7 Pole 2020 GMC Sierra Denali
    You must have a factory brake controller built into your 2020 GMC Sierra 1500. It will throw codes and errors because you disabled the wires. I would reconnect the wires and use them as intended. It may be a light load but the trailer your truck and the wiring harnesses are designed to use all the wires and will cause errors if not used properly or if damaged. The vehicle probably thinks the wire was damaged or destroyed and is doing its job to warn you and prevent major damage. If you...
    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 so...
    view full answer...
    Image 1 for
  • LED Combination Trailer Light Recommendation For Hitch-Mounted 4-Bike Rack
    You can use 2 right hand combination tail lights for your bike rack. Not all of the features you mentioned may be available. One of the lights I recommend you check out is the Optronics LED Trailer Light, part # STL56RB. This light is not a low profile but it does have the 2 inch spacing for mounting you mentioned. It also has 18 diodes. The light measures 6-1/16 inches wide, 3-5/8 inches tall and it is 2-1/4 inches deep. This lamp would work for you, but keep in mind that the lamps...
    view full answer...
  • Replacement Trailer Connector with 8 Wires for a Boat Trailer
    A 4-flat trailer connector is responsible for carrying four functions which are usually brake, left turn, right turn, and tail lights. I am not familiar with a 4-way trailer connector that uses 8 wires as I do not see what the other wires could be for. The best way to determine the correct replacement would be to test each of the wires for function with a circuit tester and then replace the connector with the one that has the slots for the functions you need. It may be that instead of splicing...
    view full answer...
  • How to Attach a Trailer with a Separate 6-Way Harness to a Vehicle with a Combined 4-Way Harness
    In order to allow for the 4-way trailer connector on your Jeep to operate the lights on your trailer you will first need to install a converter box on the trailer like part # C56196 which will combine the brake and turn signals. You will then need to install a male 4-way trailer connector like part # HM38168 on the trailer that will attach to the opposite end of the converter box. In order to make these connections I recommend using part # DW05744-10. In order to allow for the 6-way trailer...
    view full answer...
  • What Are The Standard Colors And Functions For A 4 Flat On A Cargo Trailer
    The standard 4 Flat will have the White (ground), Brown (running lights), Yellow (left turn and brake), and Green (right turn and brake). Black will typically be used for 12 volt power, but can also be any number of things. The only way to know for sure what it is used for will be to trace it to its source. However, if you only need the 4 standard functions, you can definitely just cap that off and use something like the Hopkins 4 Flat # HM38168. With that said, if you do trace it and...
    view full answer...
  • License Plate Relocation Bracket for Viking Solutions Stack Rack II 2-Level Cargo Carrier
    It is good to note that when using a hitch mounted accessory like the Viking Solutions Stack Rack II 2-Level Cargo Carrier # 310-VSR201, that your license plate will be hidden when you have cargo loaded up. While Viking Solutions doesn't have a kit dedicated to relocating your license plate, we do have some options here at etrailer. I recommend either using the Mount Bracket # LP10SB or # LP5SB for your application. You will have to drill holes through the carrier, but after you do so...
    view full answer...
  • Is There a License Plate Bracket for the Thule T2 Pro XT Bike Rack
    To add a license plate bracket to any bike rack will require you to modify the bike rack. If you are willing to do that with the Thule T2 Pro XTR, # TH83JV, then your best bet would be a bracket with a light in the event that you are carrying your bikes at night. I recommend the Optronics License Plate Light w/ Mounting Bracket # LP55CB. To provide power to the light the easiest thing to do would be to install the T-One # 118467 which is a plug-in wiring harness (see attached installation...
    view full answer...

Do you have a question about this Trailer Wiring?




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Info for this part was:

Employee Lindsey S
Edited by:
Lindsey S
Employee Michael H
Expert Research:
Michael H
Employee Cole B
Installed by:
Cole B
Employee Alexander C
Written by:
Alexander C

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