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Hopkins 4-Way Flat Trailer Wiring Kit - Vehicle and Trailer Ends

Hopkins 4-Way Flat Trailer Wiring Kit - Vehicle and Trailer Ends

Item # HM48205
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HM48205 - Plug and Lead Hopkins Wiring
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The 4-wire design of this kit includes a 48" long vehicle wiring harness, a 12" trailer end wiring harness, and 6 quick-splice connectors. Lowest Prices for the best wiring from Hopkins. Hopkins 4-Way Flat Trailer Wiring Kit - Vehicle and Trailer Ends part number HM48205 can be ordered online at etrailer.com or call 800-298-8924 for expert service.
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  • Reviews (9)
  • Q & A (9)
  • Videos (1)
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Hopkins Wiring - HM48205

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

The 4-wire design of this kit includes a 48" long vehicle wiring harness, a 12" trailer end wiring harness, and 6 quick-splice connectors.


  • Wiring kit includes vehicle-end connector and trailer-end connector
  • 4-Wire design
  • Nylon sleeves and heat-shrink tubing protect wires
  • Includes 6 quick-splice connectors


  • Connector: 4-way flat
  • Vehicle-end wire length: 48"
  • Trailer-end wire length: 12"

48205 Hopkins Endurance 4-Wire Flat Set - 48" Long Vehicle End and 12" Long Trailer End

Installation Details HM48205 Installation instructionsAlternate Instructions HM48205 Installation instructions

California residents: click here

Video of Hopkins 4-Way Flat Trailer Wiring Kit - Vehicle and Trailer Ends

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

Video Transcript for Hopkins Wiring - Trailer Connectors - HM48205 Review

Today we're going to be taking a look at part number HM48205, this is the Hopkins four way flat trailer wiring kit. This kit's going to include, both your vehicle end connector, it's going to measure 48" long and your trailer end connector, that's going to measure 12" long. You're going to get new connectors at the back of your vehicle and on your trailer. These two will mate up perfectly together with another. That way you can send the signals from your vehicle back to your trailer. This is a four wire design, it's going to have the wire functions printed on directly on the wires for easy reference.

That way you can just look on the wiring and see which wire contorls what function. That's a nice feature to have. The plugs on them are going to feature corrosion resistant terminals so it's going to last a long time. One thing you can do to help prevent rust and corrosion to the terminals is that you can apply some dielectric grease to the terminals and that's going to help keep out corrosion. If you don't have some of that you can pick some of that up here at etrailer.com, it is sold separately but again that's going to help prevent corrosion. It's also going to include six quick splice connectors which makes connecting the wires very easy. Pretty simple installation, you want to choose an installation location at the rear of your vehicle.

Attach the car side on the female half to the same functions on the tow vehicle and then attach the trailer side color wires on the male half to the trailer and then you'll plug the mating parts together and check the lighting system for proper operations. That's going to be it for today's look at part number HM48205.

Customer Reviews

Hopkins 4-Way Flat Trailer Wiring Kit - Vehicle and Trailer Ends - HM48205

Average Customer Rating:  5.0 out of 5 stars   (9 Customer Reviews)

The 4-wire design of this kit includes a 48" long vehicle wiring harness, a 12" trailer end wiring harness, and 6 quick-splice connectors.

- HM48205

Excellent fast shipping. Order was perfect. Prices are great! 657966

- HM48205

Product better in person then appeared in pictures. Fast shipping. 466060

- HM48205

I ordered LED tail lights and new light harness and a harness tester. Everything is working great. 454261

- HM48205

I have not installed the trailer wiring kit yet but wiring looks to be of a very high quality. Do note that the wiring for the trailer is 12 inches not 12 feet unlike me so your not placing another order with etrailer (boo hoo!!!) Thanks for the great selection etrailer you are the first one I go to if I need anything that is not food, keep up the great work. 432246

- HM48205

Ordered trailer hitch wiring connections, wires, mounts, etc. All arrived just as ordered, and within 5 days. The quality was top-shelf, which is why I continue to reorder from etrailer.....NO JUNK & NO MISTAKES, sounds simple but so many companies get it wrong 385325

- HM48205

It's always the same.......GREAT!! 349861

- HM48205

What we needed to help the person,who loaned us his trailer,fix the damaged parts left by other borrowers,was ordered,shipped & received, thanks for the great (QUICK) service. Your people jumped on it. Great Crew !!!!!!!!!!!! Can't show pictures,as the owner has'nt put them on yet,but the parts will make the trailer look back to new. Thanks,stay Blessed Bob & Lynda Snelling Mossyrock WA. 304044

- HM48205

Very helpful and knowledgeable. I will continue to shop with etrailer.com because of his service. 296207

- HM48205

My 12 ft utility trailer needed a makeover, I stripped it down, installed new boards, repainted I and installed new wiring and lights. I ordered the wiring and lights from etrailer and they arrived in about a week and everything I ordered arrived in perfect shape. It installed very easily and worked perfectly when connected to my vehicle. Thanks etrailer for delivering on quality products and great service. Marty, Peoria AZ 238022


Ask the Experts about this Hopkins Wiring

  • Recommended Trailer Wiring on 1994 Ford Ranger Pickup
    To install the Hopkins 4-Way Flat Trailer Wiring Kit - Vehicle and Trailer Ends # HM48205 you will want to check for functions. Color matching doesn't always work, so I recommend using a circuit tester like # PTW2993 to test each function. I've attached an article to assist. If you choose not to hardwire your system, I recommend the Hopkins Plug-In Simple Vehicle Wiring Harness with 4-Pole Flat Trailer Connector # 40215 which is a fit for 1993 to 1997 Ford Rangers. This harness...
    view full answer...
  • How to Determine Functions of Different Colored Trailer Wires
    The Hopkins 4-way connector, part # HM48205, uses white for ground, brown for the running lights, green for right side (passenger) turn signals and brake lights, and yellow for left side (driver) turn signals and brake lights. This is the standard wire coloring for trailer wiring, but just because it's standard doesn't make it law. To match the Hopkins up to your wires you're going to need to find out what each color does because there isn't anything to tell us. on the vehicle side...
    view full answer...
  • Can Trailer Wiring 4-Ways be Used to Power 12 Volt Lights
    4-way connectors are designed to carry 12 volt power circuits. A lot of people use them to power LED light bars mounted below the tailgate so you could easily do what you are looking for. The white wire of the 4-way is typically the ground. The part # HM48205 comes with both 4-way connectors needed so it would work well.
    view full answer...
  • Wiring Small Trailer With 4-Way Connector To Match Towing Vehicle 4-Way Wiring
    My best recommendation is to first make sure the brakes are not needed on the trailer. If you find that is the case you can cut off the 7-way connector on the trailer and just use the 4-way wiring for the turn, running, and brake lights on the trailer. If brakes were put on the trailer by the manufacturer there may be a requirement for the trailer. If the brakes were installed by the owner then you may be right that they are not needed. I recommend using part # HM48205. This comes with...
    view full answer...
  • Adapter For Towing Trailer with Separate Turn Signals with Vehicle with Combined 4-Way
    The trailer you have may already have a taillight converter installed on it so that the turn signals would be separated out. If you try to attach the 4-way of your tow vehicle to the 5-way do the lights work fine? Typically the 5-way is seen for reverse lights or a reverse lock out if the trailer has surge brakes. If not you would need the part # 118158 to separate out your combined vehicle wiring. You could cut off the 5-way of your trailer, wire this in place of it and then on the...
    view full answer...
  • Do 4-Way Connectors Have a Power Wire
    Trailer and vehicle 4-way connectors like you'll find with the 4-Way Flat Trailer Wiring Kit - Vehicle and Trailer Ends # HM48205 do not actually have a hot - or power - wire. As you can see by the cut out I added of the linked help article on trailer wiring (which I highly recommend checking out), a 4-way will activate running lights, brake lights and turn signals. I have added a link to our entire selection of trailer end 4-way connectors for you to take a look at.
    view full answer...
  • Converting Wiring On 2008 Volkswagen Touareg To Tow Trailer With 3-Wire Lighting
    Unfortunately we do not sell the modulate unit or the harness by itself. We receive these as a complete unit and individual parts are not made available to us. I do have a solution for you. You can use the # 118509 kit on your Touareg. This will give you a 4-way trailer connector. You can attach part # C56196 to convert the signal back to a 3-wire on the trailer. You will need to attach a 4-way to the converter for the trailer. I recommend part # HM48205. This includes both a trailer...
    view full answer...
  • Solution for Towing Rockwood Trailer with 4-Way Flat Connector
    The connector of the # 30104 would be the same but the pin out is Jayco specific and would not match your trailer. Your best option is to cut off that connector on your trailer and install a 4-way flat like part # HM48205 so that your trailer can be towed by your tow vehicle and so that you can tow it with other vehicles easily as well.
    view full answer...
  • Replacing Damaged Vehicle-Side 4-Pole Connector on Curt Wiring Harness
    Yes, you can replace just the damaged connector on the 4-pole harness on your 2013 Hyundai Santa Fe GLS. Hopkins part # HM48205 includes both vehicle- and trailer-side connectors (giving you a spare for the trailer) and quick-splice connectors. Similar products you might prefer include # C58044 that gives you a 60-inch length and # HM48030 which features an ergonomic-style plug. You will connect the white, brown, yellow and green wires color for color. I suggest wrapping the splices...
    view full answer...

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Info for this part was:

Expert Research:
Jameson C
Expert Research:
Jeffrey L
Written by:
Laura H
Installed by:
Cole B
Updated by:
Alexander C

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