bing tracking image
  1. Trailer Wiring
  2. Hopkins
  3. Trailer Connectors
  4. Vehicle End Connector
  5. 4 Flat
  6. Plug and Lead
Hopkins Tail Light Converter with 4-Way Flat Trailer Connector

Hopkins Tail Light Converter with 4-Way Flat Trailer Connector

Item # HM48915
Our Price: $20.30
You Save: 29%
Trailer Wiring
Shipping Weight: 0.42 lbs
Add to cart
In Stock
zoom in icon
slider vertical icon
zoom out icon
Comment field cannot be left empty.
Name field cannot be left empty.

Thank you! Your comment has been submitted successfully. You should be able to view your question/comment here within a few days.

Error submitting comment. Please try again momentarily.

Product Images


Need help with installation?
Locate installers near me
This 60" harness has a lighting converter built into the 4-way flat plug so you don't have to worry about mounting a separate box. Designed for vehicles that have amber turn signals. Installation hardware sold separately. Great Prices for the best trailer wiring from Hopkins. Hopkins Tail Light Converter with 4-Way Flat Trailer Connector part number HM48915 can be ordered online at or call 1-800-940-8924 for expert service.
  • All Info
  • Reviews (30)
  • Q & A (0)
  • Photos

Hopkins Trailer Wiring - HM48915

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

This 60" harness has a lighting converter built into the 4-way flat plug so you don't have to worry about mounting a separate box. Designed for vehicles that have amber turn signals. Installation hardware sold separately.


  • Provides a 4-way flat trailer connector at the back of your vehicle to power your trailer's signal lights
    • Compatible with 5-pole, 6-pole, and 7-pole adapters (sold separately)
  • Ensures your vehicle's wiring matches that of your trailer
  • Designed with safety in mind
    • Guards against electrical shorts and mis-wire situations
  • Splices into your vehicle's wiring
    • No need to mount a separate converter box
    • Color-coded labeled wires ease installation
    • Wire connectors sold separately
  • Resists damage from dust and humidity
  • Includes durable, molded-rubber, female output socket with protective dust cover


  • Application: vehicles with 3-wire electrical systems
  • 4-Way harness length: 60"
  • Ground wire length: 60"
  • Splice-in wire length:
    • Brown, red, yellow: 60"
    • Green: 60"
  • Max amperage:
    • Turn lights and brake lights: 2.1 amps per circuit
    • Tail lights: 2.1 amps per circuit
  • Wire gauge: 14
  • 90-Day limited warranty

Do I Need a Tail Light Converter?

Difference between 2 wire systems and 3 wire systems

Some vehicles operate on a 3-wire system, wherein the brake signal and the turn signals run on separate wires to illuminate different lights. (Typically, these vehicles have amber turn signals.) But most trailers run on a 2-wire system, which means the brake and turn signals travel along a single wire. You'll notice that, on your trailer, the brake light will flash for the turn signals.

If your vehicle operates on a 3-wire system, it will need to be converted so it will be compatible with the wiring system of your trailer. This is where a tail light converter comes into play. This converter lets you combine the brake and turn signal functions of your vehicle so they run on a single wire to properly activate your trailer's tail lights.

Converter Wiring Configuration

Wire Color Wire Function
Green Right turn
Brown Tail lights and parking lights
Red Brakes
White Ground
Yellow Left turn

Tail Light Converter Installation

To begin the installation, use a circuit tester (sold separately) to double-check the function of each wire on your vehicle's tail light wiring harness. The color/function of the splice-in wires on this converter may not match the color/function of those on your vehicle, so you'll want to be sure to check all of the wire functions first. Once you've figured out the functions of your vehicle's wiring, use quick-splice or butt connectors (sold separately) to connect the corresponding wires on the trailer connector.

Because this doesn't have a separate box, you don't have to worry about mounting it. But if you want to keep the harness from hanging or dragging the ground, you can install a 4-way flat mounting bracket.

How to find a grounding point

Find a raw, unpainted metal surface to use as a grounding point and secure the white ground wire with a self-tapping screw (sold separately). Cleaning the surface prior to securing the white wire will ensure the converter is fully grounded. Finally, secure the converter wires to your vehicle using cable ties (sold separately).

Quick Tips:

  • Butt connectors - especially heat-shrink ones - provide the most secure, longest-lasting connection, so we'd recommend you grab a few for this installation.
  • Use a circuit tester on the plug terminals once the harness is installed to make sure everything's working. There's nothing worse than figuring out that you have a bad ground or a faulty connection right before you're about to hit the road.
  • Be sure to put a little bit of dielectric grease on the 4-way plug to protect the terminals from dirt, grime, and corrosion.

48915 Hopkins Vehicle Wiring Harness with Vehicle End 4-Pole Connector and Tail Light Converter - 5' Long

California residents: click here

Customer Satisfaction Score:

Customer Reviews

Hopkins Tail Light Converter with 4-Way Flat Trailer Connector - HM48915

Average Customer Rating:  4.5 out of 5 stars   (30 Customer Reviews)

This 60" harness has a lighting converter built into the 4-way flat plug so you don't have to worry about mounting a separate box. Designed for vehicles that have amber turn signals. Installation hardware sold separately.


I used the Hopkins 3 to 2 converter to make a 6-pin round to 4-flat connector for my Winnebago View motorhome. While there are 6-4 plugs available to do this, they do not work on the Winnebago View (no brake lights). This adaptor works great.

Skip E.


Still working great after a year on my 07 Winnebago View.


This device was no help in connecting my five wire trailer to my four wire goldwing. I ended up having to use a number of diodes in the trailer wiring to make everything work properly. My trailer had red LEDs that were used for Brake, Turn & stop and I had to get the brake and turn function to share the same lead on the light fixture.


Well this is the second one I bought go bad so I just added extra lights and changed trailer plug from 4 to 6 round plug. One failed after using and the other one never worked from the start. All that would work were tail lights.


I have an older foreign car and tow constantly. This has worked very well. This little converter gets me from the odd multi prong euro plug to a standard trailer plug. Very easy.


Easy to install if you know how to splice new wires into the existing wiring on your vehicle and have connectors (not included) to do it.


Had problem with "toad" lights. Called etrailer and eventually talked with "Bill" a technicial. Together we decided the problem was probably the "converter" on the RV. Order new converter which was shipped that dat. Received and installed on Monday 11/30/2020 and sure enough PROBLEM SOLVED!


Perfect solution: towing vehicle separate brake and turn signal lights, towed vehicle lights combined.


Products came on time and exceeded my expectations. I've placed 3 orders with them over the last 6 weeks and have been thrilled. Highly recommend them. While free freight would be a nice adder I did find that they used the US Post Office for under 3 bucks on one of my orders whereas others would have charged around 15 bucks for UPS for the same items to be shipped. I really liked that!!!


The wire harness worked great. The help and support I received from etrailor was excellent.


Etrailer has been a life saver for our business! We repair trailers and install truck accessories and have found etrailer to sell name brand parts at much cheaper prices. Melissa A is absolutely the BEST!!


Products were exactly what I ordered. Described perfectly & shipped fast with tracking.




this is better than CURT converter


The wiring converter worked exactly as designed and was simple to install.


Always good parts and service at etrail er


Could have bought at a local auto store at a cheaper cost. Took a week to get to me. Buy service was good.


Great product, this outlasted the 2 curt units I had on the same escape.


Product delivered as ordered and on time. Have yet to install it so I don't have an actual product rating to share.


I think you guys are awesome especially when A real person answers the phone so I can get quick results in my purchase thank you very much I will order from you guys again thank you


Everything worked great!! Customer service was great!



Excellent product, would definitely purchase again


The item i ordered was exactly was i needed. It arrived faster than i expected.


As expected, great product



Exelent service
and speedy delivery

Show More Reviews

See what our Experts say about this Hopkins Trailer Wiring

  • Can Hopkins Trailer Wiring Harness HM48915 be Used on a Honda Goldwing with Separate Brake Lights
    You can use the Hopkins trailer wiring converter, # HM48915, to converter the 5-wire harness on the Goldwing to a 4-way used by your trailer. On the harness the red wire is for brake lights and would connect to the blue wire on your motorcycle wiring. All the other wires, green, yellow, brown, and white, will attach color for color to the motorcycle harness.
    view full answer...
  • Installation of 4-Pole Wiring Harness on 1998 Ford F-150
    On the 1988 Ford F-150 the brake and turn signal lights are already converted, so a converter is not required. For your F-150 vehicle, instead of the Hopkins Vehicle Wiring Converter, part # HM48915 I would recommend the T-1 connector part # 118316. I will provide you a link below to the installation instructions for the T-1 connector as well as an installation video. The T-1 plugs inline into the connector that is usually located on the left side frame rail. The existing wiring harness...
    view full answer...
  • Recommended Trailer Wiring Harness/Tailllight Converter for 2007 Toyota FJ Cruiser
    Your FJ cruiser uses a separate bulb for turn signals, instead of the less sophisticated wiring system used on most trailers where one circuit carries both the turn signal and brake lamp. In order for the trailer connector to work correctly, you'll need a taillight converter. The Hopkins # HM48915 you'd looked at would work, but there are easier to install (albeit more expensive) plug and play options like # 118405 which plug inline at the connection between the vehicle taillight harness...
    view full answer...
  • No Right Turn Signal Using HM48915 Wired to A Motorcycle
    First, It is a good idea to double check the ground from the Hopkins Converter part # HM48915. Make sure it is grounded to a clean bare metal surface. If your ground connection is good, check that you are getting power to the right turn wire from the motorcycle's before the converter. if you are not getting power from the wire at the motorcycle, check the wire for any damage or frayed wiring. If you find you are not getting power from the right turn wire on the motorcycle, then those...
    view full answer...
  • Do I Need a Trailer Taillight Converter for a 2003 Chevy S-10
    The plug and play trailer wiring harness options we offer for a 2003 Chevrolet S-10 are all non-powered meaning they will pull power from the vehicle's taillights. This is perfectly fine for smaller trailers that don't use as many lights. I recommend the T-One Vehicle Wiring Harness part # 118359.
    view full answer...
  • Solution for Trailer Wiring of 2007 Toyota Corolla Where Left Turn Signal Stopped Working
    If power is going into the converter box but none is coming out of it that would indicate that the convert is bad and need to be replaced. Since we don't have just the boxes by themselves available you'd want the new kit with part # 55542 which is the entire kit.
    view full answer...
  • Will Hopkins Wiring Converter # HM48915 Work on 2000 Plymouth Neon Towing Trailer With LED Lights
    The Hopkins Vehicle Wiring Converter, part # HM48915, is used for a vehicle that will have a 3-wire system, which means it would have separate stop and turn signals, to plug into a trailer with a 2-wire system, which has the stop and turn signal combined. Your 2000 Plymouth Neon will have a 2-wire system, so the # HM48915 converter is not needed. To get a 4-way on your Neon you can use the Draw-Tite Wiring Hardwire Kit, part # 18252. Using the included circuit tester these wires will tap...
    view full answer...
  • Trailer Wiring Harness Recommendation for a 2011 Ford Escape
    Technically you could use Hopkins trailer wiring harness # HM48915 on your 2011 Ford Escape. But since your 2011 Ford Escape uses a combined wiring system (brake lights and turn signals on the same bulbs) you would ground the red wire with the white wire. Brown is for running lights, yellow is left turn/brake lights, green is right turn/brake lights, and white is ground. Using this harness means you would have to splice into the vehicle wiring. For a much easier installation I recommend...
    view full answer...
  • Troubleshooting Trailer Wiring and Short In Trailer Plug
    In order to determine the specific problem you will need to purchase a circuit tester if you do not have one - the very handy Cordless Circuit Tester # PTW2979 would be my strong recommendation due to how easy it is to use - and test the connector on your vehicle after disconnecting it from your trailer. Check the wiring going into your harness from your tail lights to see if those wires are carrying the correct signals, if not then the issue is with the vehicle wiring. If the signals...
    view full answer...
  • Converter Needed to Activate Separate Brake Light of Trailer Wiring that is Separate
    Well the part # HM48915 that you referenced is not designed to provide a separate brake light out from the rest of the wiring so if the separate brake lights you mentioned are not activating it's because of that. What you would need is to install the part # RM-732 on the trailer side of your wiring and the red wire would be what you would need to run your separate brake light to.
    view full answer...
  • Adding a Trailer Wiring Harness to a 2000 Harley Davidson
    We do have some wiring harnesses that you can use on your 2000 Harley Davidson but they are not T-connectors, they are all hardwire. A harness like # 119147KIT would work for you. The green wire taps into the right turn signal, yellow for left turn signal, red for brake lights, and brown for running lights. This unit will also need to be connected to the bike battery and what this does is actually power the trailer lights to help isolate the bike wiring from the trailer wiring for additional...
    view full answer...
  • Trailer Wiring Kit # HM48915 Troubleshooting for Use a 2006 Dodge Ram 2500
    It sounds like you have a short either in the way you are wiring up the Hopkins Vehicle Wiring Converter, part # HM48915, or your trailer has a wiring issue that shorts out the entire circuitry of the # HM48915 and causes all of the tail light functions of your trailer to not work. First thing I would check is that the way you wired in the # HM48915 to your tow vehicle. First thing I would do is wire the red wire from the # HM48915 to the wire that has voltage when the brake pedal is...
    view full answer...
  • 4-Way Plug with 3-Wire to 2-Wire Conversion and Mounting Bracket
    While we do not have a 4-way converter like the Hopkins Vehicle Wiring Converter with 4-Pole End, part # HM48915, with a mounting bracket, you can easily add one for this using the Mounting Bracket 4-Pole Flat, part # 18144. I've linked to an installation video of the bracket so you can see how it's done.
    view full answer...
  • Trailer Wiring Harness with 4-Way Flat Connector for 1997 Honda Valkyrie
    First, with LED lights, the color of the bulb needs to match the color of the lens. Otherwise you will have dim lights or off-color lights. If you want you can replace just the 4-Way end on the harness that you have with # HM48190. If you want to replace the whole harness I recommend going with a powered option such as # 119250KIT which will get the power for the trailer lights directly from the battery instead of drawing it through the tail light wiring.
    view full answer...
  • 4-Pole Wiring for my 1995 Jeep Grand Cherokee
    Yes, you can use the Hopkins Vehicle Wiring Converter with 4-Pole End, item number HM48915, to wire your Jeep for a 4-way trailer connection. Keep in mind that this unit will need to be hard wired into the vehicle's taillight circuits and that it only supplies 2.1 amps per function so the trailer can only have lights at the rear and no extra lighting. You will need to use a circuit tester, item # PTW2993, if you need one, to find the correct wiring to splice the connector to. An easier...
    view full answer...
  • How to Hardwire in a Hopkins Trailer Wiring Harness on a 2004 Toyota Camry
    There are several different trailer wiring options available for the 2004 Toyota Camry but # HM48915 is not one of them. The wire functions on this harness are as follows: White is ground, attach to bare metal surface Brown is running lights, attach to running light wire on driver side of vehicle Yellow is left turn signal, attach to left turn signal wire on vehicle Green is right turn signal, attach to right turn signal wire on vehicle Red is brake lights, attach to brake light wire...
    view full answer...
  • Correct Wires on a 1991 Ford Aerostar to Install Hopkins Vehicle Wiring Converter # HM48915
    In order to find the correct wires for installation of the Hopkins Vehicle Wiring Converter, # HM48915, you will need a circuit tester like # 3808. This wiring harness is designed for use on vehicles that have amber or independent bulb turn signals which should be what is on your 1991 Ford Aerostar. First, ground the white wire to a bare metal surface. Next, using the circuit tester, probe the wires behind the driver side tail light until you find the one that carries a constant signal...
    view full answer...
  • Recommended Trailer Wiring Harness Options for 2002 Jeep Liberty
    If you're comfortable with the process of using a circuit tester like # PTW2993 to locate which circuit serves which taillight function, and then tapping the input wires for the Hopkins # HM48915 taillight converter into those circuits, you can certainly use that option. This being said, the Curt # C55382 converter would be a plug and play option that would be much easier to install. Better still would be the Tow Ready # 118524. The Tow Ready is also a plug and play option, but instead...
    view full answer...
  • Will Hopkins Vehicle Wiring Converter HM48915 Operate Turn Signals In-Phase with Vehicle
    The Hopkins Vehicle Wiring Converter # HM48915 will do what you need; it will take the separate stop and turn signals from the individual lights on your 1999 Nissan Frontier and combine them onto one wire as required by typical trailer lighting systems. With this in place you could then add a set of magnetic towing lights like # TL21RK. I confirmed with my technical contact at Hopkins that this converter's turn signal output will be IN PHASE with the vehicle's turn signals. You might...
    view full answer...

Do you have a question about this Trailer Wiring?

Info for this part was:

Employee Mike L
Expert Research:
Mike L
Employee DeAnne T
Expert Research:
DeAnne T
Employee Michael H
Expert Research:
Michael H
Employee Jeff D
Expert Research:
Jeff D
Employee Jameson C
Expert Research:
Jameson C
Employee Adam R
Expert Research:
Adam R
Employee Wilson B
Updated by:
Wilson B
Employee Alexander C
Updated by:
Alexander C
Employee Sabrina W
Updated by:
Sabrina W

At we provide the best information available about the products we sell. We take the quality of our information seriously so that you can get the right part the first time. Let us know if anything is missing or if you have any questions.

Product Experts Available Now!
Call 1-800-940-8924