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  1. Custom Fit Vehicle Wiring
  2. Ram
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  4. 2012
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FITS 2012 Ram 3500
Hopkins Tail Light Converter with 4-Way Flat Trailer Connector

Hopkins Tail Light Converter with 4-Way Flat Trailer Connector

Item # HM48925
Our Price: $25.95
Custom Fit Vehicle Wiring
Confirmed to Fit
2012 Ram 3500

without factory trailer connector

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The best technical support and full custom fit vehicle wiring installation instructions. Great price 3500 custom fit vehicle wiring and expert service. Ram 3500, 2012 custom fit vehicle wiring by Hopkins are available from etrailer.com. For expert service call 1-800-940-8924 to order your Hopkins Tail Light Converter with 4-Way Flat Trailer Connector part number HM48925, or order online at etrailer.com.
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  • Reviews (110)
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2012 Ram 3500 - Hopkins Tail Light Converter with 4-Way Flat Trailer Connector

  • 4 Flat
  • Trailer Hitch Wiring
  • Hopkins
  • Converter

This tail light converter with a 72" 4-way flat harness converts your Ram 3500's lighting system to match your trailer's. Designed for Ram 3500s that have amber turn signals. Installation hardware sold separately.


Features:

  • 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 that 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
    • 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


Specs:

  • Application: vehicles 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 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.


Use double-sided tape to stick the converter box to a flat surface inside your vehicle 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 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.


48925 Hopkins Ram 3500 Wiring Harness with Ram 3500 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   (110 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.

by:

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.



by:

Works with L E D lights

Jason

9/9/2023

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.

11/2/2023

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


by:

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.



by:

Still works great



by:
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.

Jemecad

8/4/2017

Fine and dandy!



by:
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.

Nm_bob

3/28/2019

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



by:

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 etrailer.com....



by:

Perfect product, perfect for the job I needed

Les C.

4/29/2023

Was the perfect choice



by:
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.



by:
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.



by:
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.



by:
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.

5/18/2022

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



by:

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



by:
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.



by:
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.



by:

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!



by:

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

Tom S.

6/26/2020

all in good working order



by:
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



by:
2001 Nissan Xterra

Just what I wanted. The right part every time. Thanks etrailer.com

Scott D.

6/13/2018

Just fine, no problems.



by:

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.



by:

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.



by:

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

Bruce

1/14/2022

fantastic. this is a high quality item



by:
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.



by:

I verified the signals coming from my motorcycle and the colors didn't match up to the standards but doing that and using solder pellet shrink connectors made it a neat and easy install.



by:
2002 Nissan Xterra

You have the right part and ship fast.I now am able to get my wiring done for trailer lights. Thanks


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Show More Reviews

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

  • 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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  • How To Wire a Trailer Harness on a 2000 Mitsubishi Montero
    Installation for a 2000 and a 2003 Mitsubishi Montero should be about the same. Part # HM48925 will work, but part # 119178 is circuit protected and will protect your vehicle electrical system. You could also use part # 119178KIT which will have all the connectors needed to splice into wires and a circuit tester to make sure you have the right wires. If your vehicle has aftermarket LED tail lights, you must use part # HM48925. Use the video for the 2003 Montero as a guide. The installation...
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  • 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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  • How To Wire a Harley Ultra Classic with a 5-Pole Round and a Trailer with a 4 Pole Flat
    I am guessing that you have a connector similar to the 5-Pole round like part # PK11502. If this is the case, you have two options. You can either remove the 5-Pole round from your Harley and put a 4-Pole flat in place, or you can cut the connector of your trailer and use a 5-Pole connector for the trailer. I imagine the 5-Pole on the bike is mounted pretty well, so I would suggest replacing the trailer connector with a 5-Pole using part # PK11501. Using a circuit tester, like part # 3808,...
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  • Changing a UK Wired Tailer to a USA 4 Wire System for Use with a Lincoln Navigator
    You could make an adapter to go from the connector on your Aviator, if it is a factory 7-Way connector, to the 5 wires on your trailer. I would use the Pollak Black Plastic, 7-Pole, RV-Style Trailer Connector, item # PK12706, along with the 5-Flat Vehicle End 5-foot Wiring Harness, item # HM37908, to build an adapter. Once the adapter is built and wired, I would use the 5-Flat Trailer End 48-inch Harness, item # 20017, to splice to the trailer wiring. If you have a 4-Way connector at the...
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  • Recommended Trailer Wiring Harness for 1996 Ford Contour
    Your 1996 Ford Contour does indeed have a combined wiring system, meaning the brake and turn signals are sent along the same wire. If you are needing to install a 4-Way wiring harness for towing a small trailer, I recommend the Tekonsha 4-Pole Hardwire Kit # 18252. This universal hardwire kit is designed for combined vehicle wiring and includes a circuit tester to help with installation. I have attached the written installation instructions that you can take a look at.
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  • Converter Needed to Go From Combined Circuit to Combined
    Our trailer wiring kits do not work in reverse. Since the # HM48925 goes from separate circuit to combined you'd just need a converter that goes the opposite direction like # 118158.
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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.
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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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  • Turn Signals Come On With Brake Lights When Towing
    It sounds like there may a wiring issue or a bad converter. When installing the Hopkins Tail Light Converter Kit part # HM48925 you want to hook up the wires to the following on your 2005 Honda Element. Wires on converter - White (ground) connects to Black wire on Element Brown (tail light function) - connects to Red and Black wire on Element Yellow (left turn function) - connects to Green and Yellow wire on left side of your Element Red (brake function) - connects to green wire on Element Green...
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  • No Brakes Or Blinker With A Hopkins HM48925 Converter - What Can I Do?
    It certainly sounds like you are dealing with a bad converter. If you have already tested the wires going in and out of the Hopkins # HM48925, you have narrowed the problem down to the converter itself. It is not unheard of for the converters to go bad after some time. It would not make a difference with the LED/incandescent light setup. You should still be getting good signal in and out of the converter. At this point it will need to be replaced. We do suggest going with a different...
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  • Recommended Replacement Trailer Wiring Harness For 2002 Dodge Ram 1500 With 4-way
    We have just what you need for a trailer wiring harness replacement. But you may want to first check the trailer wiring fuses or relays. You should have a fuse legend on the inside fo the fuse panel. You should be able to find it in the owner's manual or check with your dealership for the trailer towing fuses or relays. You said you have the Mopar wire harness on your 2002 Ram. If you did not have a 7-way harness I recommend part # C55504. You just need to locate the connection points...
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  • Parts Needed to Install a Prodigy P3 Electric Brake Controller in a 2007 Dodge Ram 2500
    The Prodigy P3, part # 90195, is the same for all vehicles. The wiring, like you've read, is what varies from vehicle to vehicle, and it can be tricky because sometimes it depends on how the tow vehicle was originally equipped from the factory to determine what you need. The 2007 Dodge Ram potentially included a 7- or 4-way trailer connector directly from the factory or no connector at all. If yours had either the 7- or 4-way, then you can use part # 3020-P to plug in the P3 and plug...
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  • 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...
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  • Will Curt Trailer Hitch Reciver Fit on 2012 Ram 1500 Express with 1-1/2 Inch Body Lift
    As long as the body lift doesn't interfere with any of the mounting points of the Curt # 13333 there won't be an issue. I've linked the installation instructions for you to take a look at. Since your truck is raised you may need a ball mount that is adjustable. The B&W Tow and Stow # BWTS10038B is a great option and includes two hitch balls. It flips over and stores under the hitch and out of the way when you're not towing. You use the locking hitch pin # BX8858 to keep it secure to...
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  • 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.
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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
  • Parts Needed to Tow Trailer with 2003 VW Golf TDI
    Since you have a factory hitch on your 2003 VW Golf TDI it wouldn't be worth upgrading to a new hitch like the Curt # C11066 as it wouldn't gain you any additional capacity. You would need trailer wiring too if you didn't have that already like with the part # HM48925. For a ball mount you would then want the part # C45016 with the hitch ball # 19258.
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  • Trailer Wiring Harness for a 1994 Toyota Land Cruiser
    We do have a trailer wiring harness that you can use on your 1994 Toyota Land Cruiser. You will need to use a hardwire converter, # HM48925. I have included a link to the installation instructions for you. You will need to use a circuit tester like # PTW2979 if needed to test the wiring on the vehicle tail lights. On the driver side the wire for the left turn signal will attach to the yellow wire. The wire for brake lights attaches to the red wire. And the wire for running lights attaches...
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  • Parts Needed to Install a 7-Way on a 2004 Isuzu Cab and Chassis Truck
    You would need to start with the taillight converter/4-way part # HM48925. This will convert the taillight signals and will give you a 4-way that you could plug into an adapter like part # 37185 to convert it to a 7-way. f you do have trailer brakes you would need the # ETBC7 instead of the # 37185 and a brake controller. This kit comes with everything needed to wire up the 7-way and install a brake controller. For a brake controller I would recommend the Prodigy P2 Brake Controller part...
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  • Troubleshooting the Hopkins Tail Light Converter Kit # HM48925 on 2004 Nissan Xterra
    The Hopkins Tail Light Converter Kit with 4-Way Flat Connector - LED Compatible # HM48895 that I gave as the answer previously is designed specifically for use with vehicles LED lights. The resistor that some of our customers have had success with are the Load Resistor Kit for LED Turn Signals - 50 Watts - 6 Ohm - Qty 2 # DI34ZR. These load resistors prevent hyperflashing on turn signals with LED light bulbs.
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  • Trailer Brake Lights Not Working when Towing with a 1992 Toyota Camry
    You are on the right track with the converter. The reason your brake lights on your trailer aren't currently working is that the brake light and the turn signal are two separate circuits on your vehicle. On your trailer, these two functions share the same circuit, so a taillight converter is needed to combine the brake and the turn signals on to the same circuit. The wiring harness you mention, the Converter with 4 pole end, part # HM48925 might work for you, but the manufacturer recommeds...
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  • Trailer Hitch Receiver and Wiring To Pull a U-Haul Trailer With a 2006 Dodge Ram 1500 Reg Cab 6' Bed
    Yes, the Curt Trailer Hitch Receiver # 14361 will fit your 2006 Dodge Ram 1500. It is a class IV 2" receiver that is rated for a trailer weight of 10,000lbs and 1,000lbs of tongue weight. With a weight distribution hitch the capacity increases to 12,000lbs of trailer weight and 1,200lbs of tongue weight. Be sure to reach out to a Dodge dealer with your VIN so that they can give you the maximum weight capacities of your Ram 1500. The Draw-Tite Ultra Frame Trailer Hitch Receiver # 41929...
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  • Wiring a 1995 Harley Davidson FXST for a 4-Way Trailer Connection
    Yes, I would use the Converter with 4 Pole End, item # HM48925, to wire your bike for towing a trailer with a 4-Way connector. I also ran this by our installation tech and he agreed that this is the unit to use. If your trailer has extra lighting on it, more than just two taillights and two side marker lights, you may want to consider a powered Modulite, like the 4 Pole Trailer Connector, item # C59496, to eliminate the extra amperage draw on your taillight system. The only extra wiring...
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