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Hopkins Tail Light Converter with 4-Way Flat Trailer Connector

Hopkins Tail Light Converter with 4-Way Flat Trailer Connector

Item # HM48925
Our Price: $27.00
You Save: 29%
Custom Fit Vehicle Wiring

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This tail light converter with a 72" 4-way flat harness converts your Chevrolet Monte Carlo's lighting system to match your trailer's. Designed for Chevrolet Monte Carlos that have amber turn signals. Installation hardware sold separately. 1-800-940-8924 to order Hopkins custom fit vehicle wiring part number HM48925 or order online at Free expert support on all Hopkins products. Great prices and Fastest Shipping for Hopkins Tail Light Converter with 4-Way Flat Trailer Connector. Custom Fit Vehicle Wiring reviews from real customers.
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2005 Chevrolet Monte Carlo - Hopkins Tail Light Converter with 4-Way Flat Trailer Connector

  • Trailer Hitch Wiring
  • 4 Flat
  • Converter
  • Hopkins

This tail light converter with a 72" 4-way flat harness converts your Chevrolet Monte Carlo's lighting system to match your trailer's. Designed for Chevrolet Monte Carlos that have amber turn signals. Installation hardware sold separately.


  • Provides a 4-way flat trailer connector at the back of your to power your trailer's signal lights
    • Compatible with 5-pole, 6-pole, and 7-pole adapters (sold separately)
  • Ensures that your 's wiring matches that of your trailer
  • Designed with safety in mind
    • Guards against electrical shorts and mis-wire situations
  • Splices into your 's wiring
    • Color-coded wires clearly labeled in 3 languages - high contrast for easy reading
    • Wire connectors sold separately
  • Includes durable, molded-rubber, female output socket with protective dust cover


  • Application: s with 3-wire electrical systems
  • 4-Way harness length: 72"
  • Ground wire length: 36"
  • Splice-in wire length:
    • Brown, red, yellow: 12"
    • Green: 72"
  • 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 s operate on a 3-wire system, wherein the brake signal and the turn signals run on separate wires to illuminate different lights. (Typically, these s 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 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 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 '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 , so you'll want to be sure to check all of the wire functions first. Once you've figured out the functions of your 's wiring, use quick-splice or butt connectors (sold separately) to connect the corresponding wires on the trailer connector.

Use double-sided tape to stick the converter box to a flat surface inside your near the tail lights. It's helpful to clean the surface first so the tape can adhere fully.

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 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.

48925 Hopkins Chevrolet Monte Carlo Wiring Harness with Chevrolet Monte Carlo End 4-Pole Connector and Tail Light Converter - 6' Long

Installation Details HM48925 Installation instructions

California residents: click here

Customer Satisfaction Score:

Customer Reviews

Hopkins Tail Light Converter with 4-Way Flat Trailer Connector - HM48925

Average Customer Rating:  4.7 out of 5 stars   (109 Customer Reviews)

This tail light converter with a 72" 4-way flat harness converts your vehicle's lighting system to match your trailer's. Designed for vehicles that have amber turn signals. Installation hardware sold separately.


Works with L E D lights



Everything worked after I patched it into my car. Not exactly plug and play but it works. Have a meter available.

Etrailer Expert

Mike L.


@Jason Yes, the Hopkins # HM48925 is a universal-fit trailer wiring harness that will need to be tapped into the vehicle's taillight wiring.


Outstanding! Solved my motorcycle to trailer wiring nightmare easily. My hats off to Sheila for finding a great solution. My old Gold Wing now can safely tow our equally old Bushtec, which we also updated with new LED lights from etrailer.


Still works great


This Hopkins light converter works great, is small and simple. I used it to create a converter cable from a Euro 13-pin plug to a US 4-pin flat plug. Works great and is small enough to keep the cable compact.

Saturn Relay

Installed easily. Wire colors were not the same as my car, but it wasn't hard to figure out what hooked to what. I would have given 5 stars had the four required tap connectors been included with the harness. Trailer lights and flashers worked just fine on the first attempt - didn't even need to change the turn signal relay to prevent high speed flashing.



Fine and dandy!


Perfect product, perfect for the job I needed

Les C.


Was the perfect choice

2002 Volkswagen Eurovan

I bought this for my 2002 Eurovan to wire up some safety lights for my hitch bike rack, and it was exactly what I needed! I appreciate that eTrailer has reasonable prices, unlike some VW van specialty sites.

2003 Volkswagen New Beetle

This kit was just what I needed for my situation. With the variety of vehicle light combinations, and various power requirements, trailer connections can get complicated. But etrailer seems to have exactly what is needed in each situation.
Once you choose the correct Hopkins kit, ordering is easy, and shipment is quick.



The unit is still performing flawlessly. I highly recommend where this particular unit is suitable.

2015 Volkswagen Jetta

Not worth the money. It does do the job, but u're better off searching for one that has the splicing connectors for the same or less .

Etrailer Expert

Sierra K.


We do not have any quick connects for your 2001 VW Jetta Sedan TDI unfortunately.


Not only was I pleased with the speed and efficient manner this was shipped, but due to age had a company install this unit for me. They wanted to know where I got unit for this old of an automobile and we're glad that everything they needed was right there to be installed. In this day and age it's nice to deal with such professional companies like

2006 Honda Element

Installed on a 2006 Honda Element. Found an etrailer video on youtube to help me with the wiring and everything was perfect. The device installed behind my left tail light, and I had to use a butt splice connector and some extra wire to lengthen the wire to reach the right turn signal. Even those steps were spelled out in the video.

Great website and support. Would order again from etrailer.

2004 Ford Escape

etrailer provided me with a great experience ordering a trailer hitch, a wiring kit and accessories at a competitive price. I found their web site is easy to use for finding all the components I needed to purchase and they delivered them when promised.


It wired up nice and easy. It’s very compact the instructions are very clear. Great customer service. Though it was a bitch to figure out which wires deadwood on my particular cars taillights, I had to test each wire to figure out what its function was in order to hook the correct wires together. A lot of people on YouTube were using quick splice Connectors, I soldered all of my connections. I recommend doing that

2000 Buick Park Avenue

Product was exactly as described. Only thing that i encountered different than the instructions listed ,, Stated match wiring color to color. Well it is hard to connect green to green for right turn signal when there is NO green
wire for my right turn signal. It is actually tan. So color codes don't always match. The product works great and is used to supply power to my Jazzy hauler. Does what i purchased it for. Very happy with the product and excellent service from etrailer.


etrailer is the real deal. The hitch and inverter package I purchased is high quality. heavy duty and built to last. Shipping was free and speedy during this time of so many slow downs.
I would definitely recommend to others. Thnx!


Easy install. Great service.


Installed fairly easy. Fit was exact. The carriage bolts for this frame need to be an inch shorter. Would have been nice to include a splice kit for the electrical. Installer should have adequate mechanical ability. Good product. Arrived promptly. Would shop here again.

2004 Volkswagen Golf

The wiring harness works perfectly on my 2004 VW golf TDI. Not sure why I needed the electronic controller for my car, but this is what was recommended, and it works.

2016 Toyota Tacoma

Converter replaced the original U-Haul unit that was installed with new hitch when my 2001 Toyota Tacoma was just purchased. I guess the old unit had an internal failure as the RH brake light quit working on my trailers. The new one works as it should and I hope to get another 16 years or so from it


A great product, easy to install and works perfectly


Took all of 40 minutes to install and wire up. My suggestion is to make sure to have a deep well 3/4 inch socket and an impact. It will save a bunch of time. Also get quick splices for easy wiring of your harness. Other than that pretty east stuff.


Ease of installation, good directions, works perfect from start, would get one again in future.

Tom S.


all in good working order

2005 Toyota Echo

Very good company to deal with. This tail light converter kit works really good on my toyota echo,also at a very good price.Thanks.

1997 Nissan Quest

Great product


this is exactly what I needed to upgrade my truck for wiring



fantastic. this is a high quality item

Show More Reviews

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

  • Running Lights and Turn Signal Not Working on One Side of Trailer
    On the trailer side is the 5 indicating that it is a 5-Way flat connector or that it is a 4-Way with 5 wires? On a 5-Way flat the 5th pin is usually for an electric reverse lockout on a surge coupler so it would not have any effect on the lights. If it is a 4-Way with 5 wires then that is a wishbone harness which means that the running light pin has 2 wires, 1 for each side of the trailer, for running/tail lights. Since some of the lights are working and some are not it could just be a...
    view full answer...
  • Trailer Wiring Harness that Fits 1994 Ford Aerostar
    The only trailer wiring harness we offer for the 1994 Ford Aerostar is the Hopkins part # HM48925 that you referenced. This kit installs by splicing into the taillight wires of the van. We do not have a plug and play type option like you mentioned.
    view full answer...
  • Does Hopkins Tail Light Converter Require Power From Battery?
    The Hopkins Tail Light Converter Kit with 4-Pole Flat Trailer Connector # HM48925 does not have a wire to tap into from your vehicle's battery. It is designed so you can spice into the taillight wiring harness at the rear of your 2005 Dodge Durango. I have attached the installation instructions for you to take a look at.
    view full answer...
  • Availability of Adapter to Go From European 13 Pin to 4-Way
    Unfortunately we do not have an adapter to go from a European 13-way trailer connector to a U.S. style 4-way trailer connector. European trailers typically have separate brake light and turn signal circuits, but U.S. trailers use a combined wiring system that use one wire for the turn signals and brake lights. You could make an adapter using a universal 4-way flat tail light converter like part # HM48925, but you would need to find a European trailer side 13-way connector that can be...
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  • Does Hopkins Trailer Wiring # HM48925 Fit 2004 Audi A6
    Yes, the trailer wiring harness part # HM48925 is a confirmed fit for your 2003 Audi A6. This is a universal style harness though which will require you to test the wiring of your taillights and wire to the # HM48925 accordingly.
    view full answer...
  • Troubleshooting Trailer Wiring on 1999 Chrysler Cirrus Where all 4-Way Pins Have Voltage
    If all of the wires have voltage when the signal lights come on typically that is a sign of a shorted out converter box of the wiring part # HM48925. You can test this by checking for voltage on all of the wires leading into the box to see if the correct voltage is on the wires when the appropriate turn signal is applied and then check the output side of the box. Is correct on the input side then the box is shorted out. If not then it is wired wrong. Before you replace the harness check...
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  • Troubleshooting Hopkins Tail Light Converter Not Getting 12 Volts Power on the Vehicle Side 4-Way
    I recommend checking the ground connection on the Hopkins Tail Light Converter Kit # HM48925 as it may not be making sufficient contact with a suitable ground connection. To ensure it is not the ground connection you can run a temporary jumper wire to the battery negative terminal and retest your voltage. This would also explain why the lights are even dimmer when the headlights are on. Be sure to check the voltage going into the converter to ensure that you are getting 12 volts from your...
    view full answer...
  • Why Is Taillight Converter Needed for Trailer Wiring on 2005 Toyota 4Runner
    The converter aspect of the trailer wiring for your 2005 Toyota 4Runner is not a voltage converter. Instead it converts the taillight signals to match what trailer wiring requires. Trailer stoplight and turn signals are carried on the same wire and some vehicles have the turn signals and the stoplights carried on two different circuits. That's where the converter of the part # HM48925 comes and changes the vehicles separate circuits to combined and allows the trailer taillights to function...
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  • Will Hopkins Tail Light Converter Kit # HM48925 Fit a 2008 Hyundai Accent
    Hopkins Tail Light Converter Kit # HM48925 can be used on pretty much any vehicle since it is a hardwire kit. The 2008 Hyundai Accent (sedan and hatchback models) are represented in the list of fits though because it is such a big list it is easy to miss it.
    view full answer...
  • Trailer Wiring Harness for a 1998 Toyota Tacoma
    If you want to hardwire in a trailer connector to your 1998 Toyota Tacoma then you can use # HM48925. It is just more work though when you could use a harness that plugs in line with the vehicle tail light wiring such as # HM43315. But it is totally up to you. You should not have to have any sort of special flasher or load resistors for the unit to work. That sort of thing is only an issue on certain applications with LED lights on the vehicle side and almost never affects the trailer...
    view full answer...
  • Troubleshooting Hopkins Tail Light Wiring Converter
    It sounds like you may just need to replace your wiring converter with one made for use with LEDs, the Hopkins LED Compatible Tail Light Converter Kit # HM48895. This is designed to work with the lower power draw of high-efficiency LED lighting. If you test the motorhome wiring and confirm that the signals are present there as they should be then either your converter is damaged or it is simply the wrong one for your application.
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  • Correct Hopkins Wiring Harness for a 2010 Toyota Yaris Hatchback
    The Hopkins Plug-In Simple Vehicle Wiring Harness # HM11141844 is for a 2010 Toyota Yaris Sedan so since you have the Hatchback model you'll need the Hopkins Wiring Harness # HM48925 instead. This is a splice-in kit which will still be effective and work, it just won't be a plug and play-type installation like the part you were looking at. Attached is a review video and the installation instructions for you to check out.
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  • Troubleshooting Trailer Running Lights Staying on with Wiring Kit Installed on 2013 Scion tC
    The trailer wiring harness for your 2013 Scion tC is the Hopkins # HM11141964. This uses a converter box that pulls in power directly from your battery via the lead wire and then use the other wires as "triggers" to tell the box when to send power to the correct functions. If the 4-Way connector and the ground look clean then you'll want to test the wires going into and out of the converter box. What I'm guessing is happening is that power is jumping from that lead to the running light...
    view full answer...
  • Troubleshooting the Hopkins Tail Light Converter Kit # HM48925 on 2004 Nissan Xterra
    The Hopkins Tail Light Converter Kit with 4-Pole Flat Trailer Connector # HM48925 is not compatible with LED lights. The correct wiring harness for use with LED lights is the Hopkins Tail Light Converter Kit with 4-Way Flat Connector - LED Compatible # HM48895.
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  • Recommended Trailer Wiring Harness for a 1990 Jeep Wagoneer
    For your 1990 Jeep Wagoneer I recommend the Hopkins, part # HM48925, which is confirmed to fit. It's a universal wiring harness that includes a conveter and provides a 4-way connetor at teh back of your Jeep.
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  • Trailer Lights on a Cargo Carrier Flash Rapidly with Brake Applied on a 2008 Harley Ultra Classic
    It sounds like the lights are hyperflashing. This normally occurs with LED lights. You can try moving the grounds for the lights to the carrier. If the connector on the bike is set up for separate turn signals and brake lights but the lights you added are designed for a combined brake and turn signal, that could be the problem.
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  • Combining Brake Light and Turn Signal Circuits on a Freightliner Dump Truck Trailer Connector
    If you are wanting to combine the brake light and turn signal circuits on the tow vehicle side trailer connector you can pretty much use any converter for that including # HM48925. On the input side the green wire will go to the right turn signal, yellow goes to the left turn signal, and red goes to the brake light circuit. If you do not need to wire in the brown wire for the running lights, since yours are working properly, you can ground that brown wire with the white wire. On the output...
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  • Do I Need A Heavy Duty Flasher To Install A Wiring Harness On A 2004 Ford Escape
    Neither the Hopkins Tail Light Converter Kit with 4-Pole Flat Trailer Connector part # HM48925 or the Upgraded Circuit Protected Tail Light Converter with 4-Pole Flat Trailer Connector part # 119178 will require you to use a heavy duty flasher while towing with your 2004 Ford Escape with or without the factory tow package. Each of the lighting circuits on the wiring harness has a 2.1 amp max draw, therefore this is not problematic for your factory wiring circuit. I will say that it will...
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  • Is The Hopkins Tail Light Converter HM48925 Correct For A 2001 Mitsubishi Montero Sport?
    I would be happy to help! The Hopkins Tail Light Converter Kit # HM48925 you were looking at is the correct wiring harness for your 2001 Mitsubishi Montero Sport. This kit is a universal kit that will get spliced into your factory tail light wiring to power your trailer connector. It is different than what is needed for the non-sport models as those models have a harness available that will plug in inline of the factory tail light connectors, and would not require any splicing. If you...
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  • Can LED Clearance Lights Be Used with Incandescent Bulbs on Trailer
    Yes, you can use LED marker lights on the side of a trailer that is otherwise using incandescent lights. I attached a link to a page that has all the LED clearance lights we offer as well.
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  • Troubleshooting Left Turn Signal Working Only Part of Time on Boat Trailer
    The issue you are experiencing is likely a bad ground connection. It sounds like it worked, then didn't, and now works again which definitely sounds like the ground connection. I recommend checking your main ground connection on your boat trailer if there is a consistant spot on your frame. If not, then I recommend checking the ground connection at your tail lights. There is sometimes a separate ground wire for each light and other times the ground is through the mounting hardware on...
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  • Diagnosing 2003 Dodge Ram 2500 7-Way not Functioning Trailer Lights
    Since you have tried the trailer on your wifes car and it works it is safe to assume that you have eliminated the trailer from the equation as being the problem. The first thing I would do is test the 7-way at the rear of your 2003 Dodge Ram 2500 and make sure that there is voltage in all of the correct places. Check out the picture I attached that shows the standard way a 7-way is wired. It is possible that a previous owner of your Ram wired up the 7-way incorrectly and that is why you...
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    Image 1 for
  • Draw-Tite Hitch Ground Clearance on 2012 Hyundai Accent
    With the Draw-Tite Sportframe Trailer Hitch Receiver # 24884 you will have approximately 8" of clearance to the bottom of the hitch on your 2012 Hyundai Accent. Please be aware that this is an estimate as if your particular vehicle may have larger or smaller diameter tires. Also the amount of weight that is being carried inside your Accent will change your hitch height as well as aged suspensions may sag a bit due to age. I recommend installing the Hopkins Tail Light Converter Kit # HM48925...
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  • Trailer Wiring Recommendation For A 2000 Lexus LX 470
    When it comes installing trailer wiring on your 2000 Lexus The T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector 118365 will not fit your vehicle. The wiring harness you would need is The Hopkins Tail Light Converter Kit with 4-Pole Flat Trailer Connector # HM48925. I have attached a review video link below.
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Do you have a question about this Custom Fit Vehicle Wiring?

Info for this part was:

Employee Mike L
Expert Research:
Mike L
Employee Michael H
Expert Research:
Michael H
Employee Jameson C
Expert Research:
Jameson C
Employee Adam R
Expert Research:
Adam R
Employee Jeffrey L
Expert Research:
Jeffrey L
Employee Lindsey S
Edited by:
Lindsey S
Employee Kathleen M
Installed by:
Kathleen M
Employee Wilson B
Updated by:
Wilson B
Employee Sabrina W
Updated by:
Sabrina W
Employee Alexander C
Written by:
Alexander C

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