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Tail Light Isolating Diodes (Qty 4)
Hopkins

Tail Light Isolating Diodes (Qty 4)

Part Number: 48955
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  • Reviews (106)
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Hopkins Accessories and Parts - 48955

  • Flat Tow Wiring Harness
  • Diodes
  • Hopkins


Allows motorhome or R.V. to power the lights on the towed vehicle without power feedback.

  • Includes 4 Isolating Diodes
  • May also require the 4-pole wiring harness or vehicle-to-vehicle converter (see related products below)
  • Max amperage: 3 amps
  • Max voltage: 24 volts

Note: If vehicle being towed has amber turn signals (separate turn and brake signals) then the vehicle to vehicle tail light converter (118158) will also be needed.

Product detail


48955 Tail Light Isolating Diodes (Qty 4)




California residents: click here


Video of Tail Light Isolating Diodes (Qty 4)

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




Video Transcript for What to Know About the Tail Light Isolating Diodes (Qty 4)

Speaker 1: Today we're gonna take a look at the Hopkins tail light isolating diodes for a quantity of four. Now this part will allow your motor home or RV to power the lights on the towed vehicle without power feedback. Basically, these diodes permit electrical current flow in only one direction from the motor home to the towed vehicle. It does include the four isolating diodes and the twelve spade terminals that can connect your wires to the diodes.Now this may also require a 4-pole wiring harness or a vehicle-to-vehicle converter. If the vehicle being towed has amber turn signals, meaning separate brake and turn signals, then the vehicle-to-vehicle tail light converter would also be needed. We do sell that separately.

It's part number 118158 and it's listed on this product page as a related product.Maximum amperage is 3 amps, maximum voltage is 24 volts. That should do it for the review on the Hopkins tail light isolating diodes for a quantity of four.


Customer Reviews

Tail Light Isolating Diodes (Qty 4) - 48955

Average Customer Rating:  4.8 out of 5 stars   (106 Customer Reviews)


by:

Received product in a timely manner. Need to separate the rear turn signals from the brake lights to convert the US tail lights to the European tail light assembly on my Cadillac CTS. Hopefully, this will help.



by:

not good quality control .installing the diodes on a honda CRV. No room in taillight housing so had to remove inside trim and find supply harness and installed there. Checked and everthing, ok. Hooked up to motorhome an re checked one light would not work. removed trim one more time. replaced connectors re check the discovered when wiggling wires light would blink. One tab on diode had a intermitant contact inside diode. waiting for a relacement?

Jim profile picture

Jim

2/10/2014

You replaced the bad diode contact on wiring tap had intermitant contact everything is ok and has worked flawlessly for a year. Thanks for the good service.



by:

Awesome product. Easy to install. I tow a Jeep with my motor home and this product lets me plug in and allows the tail, turn, and brake lights work with out bothering the motor home lights. I would do it again.

Kay profile picture

Kay

6/20/2019

Awesome!! They have been working perfect. Great design and easy to use.



by:

I RECEIVED THE DIODES TODAY AND INSTALLED THEM AND EVERYTHING WORKS FINE. MY VEHICLE IS A 1996 GEO TRACKER 4 DOOR. GREAT FOR TOWING. THANKS FOR YOUR HELP.



by:

Durable, waterproof, still working on an open trailer stored/ used outside through Michigan winters and trips to TN. Was able to link indicator lights to my turn signals on my longer trailer without installing extra lights.



by:

The diodes were received as promised, however, It may turn our to be a mistake on my part. These parts were ordered so I could hook up lights on my 2014 Cherokee Trailhawk so that it could be pulled behind my motorhome. After running wire from front to rear and getting the wire up to the taillight area, I found that the wiring on the Jeep was much smaller than what I had worked with on previous mods of this type. I feel that I may have to splice extra wire into the system in order to complete this installation. If you have any additional information on how to make this work on a new Cherokee, please share it with me. Thanks for your interest. Stan Jernigan



by:

This is the perfect match, to add tail and brake lights to my tow car. Simple, fast, neat and inexpensive!

Dennis B. profile picture

Dennis B.

8/3/2018

Excellent, no issues



by:

Works as any diode matrix should. In the past, I've used 2 amp silicon diodes, which works satisfactorily, but the tabs on the diodes make it so anyone should have no problems installing.

John H. profile picture

John H.

7/22/2017

Okay.



by:

This product was easy to install. The system that was installed previously had the amber directional coming on when I hit the brakes. hooking up the diodes behind the tail lights is an easier system than the old one. It works great.



by:

Good price, reasonable shipping, arrived quickly, and work great. Only problem was that there were only 11 connectors in the package.

Laura E. profile picture
Etrailer Expert

Laura E.

7/15/2017

I am sorry to hear about any inconvenience with your order, Gene, and have forwarded your review to customer service for direct follow-up with you.



by:

This product was easy to install. The system that was installed previously had the amber directional coming on when I hit the brakes. hooking up the diodes behind the tail lights is an easier system than the old one. It works great.



by:

Good product that met my expectations. Easy to install and fairly intuitive. I was thinking about purchasing the high-power Roadmaster diodes (at twice the cost) but am glad I bought these--can't tell the difference in light output. Fast shipping from e-trailer.



by:

Order was pretty much as expected and the product was received in six days. I was given a way to track the shipment but when I tried to do it and clicked on track command the screen just sat there and stared at me. I finally called and got the info.

Product is installed and performing as expected.



by:

I am very pleased with the ease of wiring up my 2012 Jeep Compass with the Tail Light Isolating Diodes kit. Very simple procedure, once I watched the video. Took my time and completed the wiring in about 2 hours.



by:

I have ordered many times through etrailer.com and have never been disappointed. Great service and ever good products. I wish you were in my home town.



by:

As discribed. A less expensive way to hook up lights for a vehicle being flat towed. Worked great.



by:

Was easy to install and has worked as expected.
My vehicle is a 2019 Chevy Colorado which requires battery to be disconnected for towing.



by:

GREAT SERVICE. EXCELLENT PRODUCT FOR THE PRICE. THANKS ETRAILER.

Lee W. profile picture

Lee W.

9/13/2017

STILL WORKING GREAT..EXCELLENT PRODUCT. EASY INSTRUCTIONS. THANKS E-TRAILER



by:

The diodes were exactly what I needed and easily installed in my tow vehicle. The price was a lot less than Roadmaster.



by:

Product arrived on time and was easy to install. I already had the wiring run from the front of jeep to the tail lights, so adding the diodes only took 1 hour.



by:

Installed just fine. Great instructions.

Steven profile picture

Steven

2/22/2020

Easy install, worked as described, no issues.



by:

Does what they say they do, no feedback to truck when toggling running lights on trailer via switch.



by:

Wiring isolation kit used on Smart car toad. Easy to install and worked great.



by:

The diodes are great. They work as designed.
As
for dealing with etrailer - you can't find a better company to deal with. Don't hesitate to buy from etrailer.com.



by:

Great little item for towing as well as other little automotive & motorcycle projects. The etrailer team was fast to respond to my order and I had it within a couple of days. I plan to do more business with a company like this!


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Show More Reviews

See what our Experts say about this Hopkins Accessories and Parts

  • Does Tow Bar Diode Kit Allow Running Lights and Stop/Turn Circuits of Towed Vehicle to Operate
    The diode kit part # 48955 that you referenced is designed to activate the running lights, turn signals, and brake lights. On each side of your vehicle two diodes are used. One is for the stop/turn circuit and the other for the running light circuit. I attached a diagram that shows how the diodes get installed on the vehicle.
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  • Do the Tail Light Isolating Diodes # 48955 Have to Be Installed at Rear of Vehicle
    If you can find the taillight wiring for your vehicle under the hood of it then you would not have to install the diodes all the way at the rear of the vehicle. They would install the exact same under your hood as long as you can find the correct circuits.
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  • Installing Magnetic Lighting on Towed Jeep To Allow Jeep Lights and Magnetic Light Functions
    The Heavy Duty Magnetic Tow Lights - 20' Wiring Harness with 4-Way Flat Trailer Connector # TL21RK can be connected to your Jeep at the back for a standard trailer connection. You can splice the 4-way into your vehicle wiring like you mentioned, and that will give you both your vehicle lights as well as the magnetic light function. Your Jeep may be able to use a T-connector to make this a much easier connection. If you already have the wiring for your Jeep to tow a trailer, you can...
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  • Parts Needed for Flat Towing a 2005 Mini Cooper 5 Speed Behind a Sprinter Class C Diesel Motorhome
    Thanks for all of the information and research on parts for flat towing your 2005 Mini Cooper behind your Siesta Sprinter diesel Class C motor home. You have most of the parts correct, but there are some specific items you will need for your Mini. First, you need to wire the dinghy so that the combined brake and turn signals on the motor home will activate both the brake and turn signals on your Mini. The brake pedal would activate the brake lights with the key in the position you describe,...
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  • Availability of a Converter for US to European Wiring System
    To convert from US to European wiring you will need the Vehicle to Vehicle Taillight Converter, item # 118158, which will convert the 2 wire system on a towing vehicle to a 3 wire system on a towed vehicle or trailer. You will run the taillight circuit normally and it is not required to run through the converter. If you are installing the converter on a towed vehicle you will need to use Tail Light Isolating Diodes, item # 48955, to keep the towing vehicle from back feeding into the towed...
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  • Trailer Wiring Extension to Go From Motor Home to Flat Towed 2008 Mazda MX-5 Miata
    What you need is the Roadmaster extension loop, # RM-300150-00. This is a 6 foot long cable with 4-Way ends. Both are male ends which is what you should need (the motor home and front of vehicle should have the same female connector). I have included a couple of helpful links to our FAQ articles on flat towing for you as well.
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  • Troubleshooting Wiring Harness Failure for 2004 Chevrolet Coloroado
    Checking for shorts is a great first step in troubleshooting your lighting issues. As you mentioned, a regular wiring harness converter box has a max amperage of 2.1 amps per circuit for stop and turn lights, and a max amperage of 5 amps per circuit for the tail lights. The Tail Light Isolating Diodes # 48955 you mentioned have a max amperage of 3 amps. There are several other things to check that might be causing your problems. Checking these additional components will ensure that you...
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  • Troubleshooting Taillight Feedback When Using 2 to 3 Taillight Convertor
    The Taillight 2 to 3 Converters like # C56196 do require diodes to be used to prevent feedback. You will be able to solve your feedback issue with a Taillight Diode Kit # 48955
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  • Diagram Showing How To Wire Taillight Diode Kit Like a 2-Wire System
    The Hopkins # 48955 taillight diode kit can indeed be used to drive the running /brake lights on your Captiva like a three function lamp, without using the amber bulb for a turn signal. See the diagram I provided, and I'll also send you a copy as an email attachment.
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  • Diodes Only for Tow Bar Wiring for a 2012 Ford Fusion
    We have diodes that you can purchase by themselves without the whole kit. Hopkins has a set of 4 diodes, # 48955, that you could use. Roadmaster also has a 4-pack, # RM-794. Or you can get a single diode using # RM-790, or a pair using # RM-792. It looks like your 2012 Ford Fusion would only need 4 diodes for tow bar wiring so one of the 4-packs is your best option if you need all of them.
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  • 2 Wire to 3 Wire Tow Vehicle Taillight Adapter for 2006 Chevrolet Colorado
    You definitely can use the 4 diodes you purchased, # 48955, to wire your 2006 Chevrolet Colorado to be towed behind your Motorhome. Along with the connector you purchased and the diodes you will need an appropriate length of Bonded 4 Wire, # 16-4B-1. I would recommend about 30 feet. When wiring the taillights your brake and turn signal will use the same filament in the brake light bulb with a 4 diode kit. I have added a wiring diagram for you to make the process easier. To eliminate running...
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  • Tail Light Isolating Diode Kit to Prevent Back-Feeding When Flat Towing
    You can use an isolating diode kit like # 48955 to prevent tail light back-feeding in your flat towing set-up. Each stop and turn circuit (4 in total) will need a diode to allow signals to travel in only one direction, without back-feeding to the RV.
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  • Recommended Diodes for Isolation on Passenger Side of Vehicle
    The Tow Ready Tail Light Isolating Diode System with 4-Pole Connector # TR118821 comes as a complete kit and is not available separately. If you need a separate diode, then the Hopkins Tail Light Isolating Diodes (Qty 4) # 48955 or Roadmaster # RM-792 are the route to go. I've attached some videos to assist.
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  • Will Tail Light Isolating Diodes # 48955 Work With LED Lights on 2018 Ford F-150
    Yes, the Tail Light Isolating Diodes # 48955 that you refererenced are compatible with LED lamps like what you have on your 2018 Ford F-150 so this would work well for you.
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  • Wiring Colors Explained for Tail Light Isolating Diode System # 38955
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    You probably could rig your damaged wiring harness in the way you describe, using diodes to keep the circuits separated, but I suggest just replacing the harness with a 4-pole set-up like # C59496. This is a hardwired harness with a substantial current capacity of 2.1 amps per stop/turn circuit and 7.5 amps for the tail lights. The risk in doing what you describe is that the wiring/circuits you would be accessing for signals may not be able to provide the required current for the trailer...
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  • Towing a Motorcycle Trailer with 4-Way Square Connector with RAV4 with 4-Way Flat Connector
    If you want to be able to tow the trailer with the RAV4 and with the motorcycle you are going to have to wire in a second connector on the trailer to match the 4-Way flat on the RAV4. The issue is that trailers designed to tow with motorcycles will likely have turn signals separate from the brake lights. The 4-Way flat on your RAV4 has combined turn signals and brake lights. This will require a special converter, # 118158, to maintain the separate circuits on the trailer. First, you...
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  • Part Needed to Separate Brake Lights and Turn Signal in 2010 Dodge Challenger
    The Vehicle to Vehicle Tail Light Converter # C56196 will allow you to separate your stop and turn signals on your 2010 Dodge Challenger. While there is not a diagram with any wire colors, you will be able to find the right wires easily by using the Cordless Circuit Tester # PTW2979. Please keep in mind it is recommended you use Diodes # 48955 to prevent power feedback. I have added a link to a video review of the converter for you to check out as well.
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  • Wiring a RV to Tow a 1998 Saturn SL2
    To wire your RV to tow your 1998 Saturn SL2 you will need part 38955. This kit will use the Saturn brake lights for both the brake lights and turn signals. If your SL2 has amber turn signals, you will also need part 118158, and two extra diodes, item # 48955, if you would like the amber turn signals to function.
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  • Wiring Needed for Towing a 2007 Kia Rio with a 2008 Freedom Express Class C RV
    Your Kia requires a taillight converter, so you will need the Tail Light Isolating Diode System, part # 38955 and the Vehicle to Vehicle Taillight Converter, part # 118158 along with two extra diodes, which will require purchasing the Tail Light Isolating Diodes Qty 4, item # 48955, or the Roadmaster Hy-Power Diodes Qty 2, item # RM-792. If you do not mind the brake lights blinking when the turn signals are activated then you can just use the Tail Light Isolating Diode System, part # 38955,...
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  • How to Wire a 2007 Jeep Wrangler so All Running Lights Work Front and Back When Used as Toad
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  • When Installing Tail Light Diode System, Does the Brake Fuse Need to be Pulled
    Once the Tail Light Isolating Diode System is installed, no fuses need be removed. Think of the diodes as sort of a gatekeeper, that will allow the current to travel only from the tow vehicle to the tail lights of the vehicle being towed, without any worry of back feeding. For more details concerning the installation of Isolating Diodes, click on the provided links.
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  • Separating Stop and Turn Signals on 2012 Dodge Challenger
    Yes, the Vehicle to Vehicle Tail Light Converter # C56196 will allow you to separate your stop and turn signals on your 2012 Dodge Challenger. Please keep in mind it is recommended you use Diodes # 48955 to prevent power feedback. I have added a link to a video review of the converter for you to check out as well.
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  • Separating Combined Tail Light Wiring on 2009 Chrysler Town and Country
    You are correct that you can use a 2-to-3 converter, the Curt # C56196, to separate the combined circuits on your 2009 Chrysler Town and Country so your brake lights and turn signals will operate independently of one another. In regards to Diodes # 48955, you should use them to prevent backfeeding. I have added links to video reviews of the converter and diodes for you to check out as well.
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