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Tail Light Isolating Diodes (Qty 4)

Tail Light Isolating Diodes (Qty 4)

Item # 48955

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48955 - Diodes Hopkins Accessories and Parts
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  • Tow Bar Wiring
  • Diodes
  • Hopkins
Call 800-298-8924 to order Hopkins accessories and parts part number 48955 or order online at etrailer.com. Free expert support on all Hopkins products. Guaranteed Lowest Price and Fastest Shipping for Tail Light Isolating Diodes (Qty 4). Accessories and Parts reviews from real customers.


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  • Reviews (84)
  • Q & A (25)
  • Videos (2)
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Hopkins Accessories and Parts - 48955


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 Tow Bar Wiring Diode Installation - 2011 Jeep Liberty

Today on this 2011 Jeep Liberty, we are going to install part number 48955. First off, what we are going to do for our wire harness is find a spot where we are going to locate the 4-pole end. And you can do it anywhere you want. We are going to actually run it to the center on this vehicle right here for now. Put it over this pin. And then we will go ahead and start routing our cable from the front of the vehicle all of the way back. Just stay away from anything moving, like the suspension components, or anything hot, like the exhaust. OK, we will take our ground wire with the ring terminal and we will run it straight to the frame. We will go ahead and show you how we routed our wire. Above the sub-frame there is a piece of tubing that goes all of the way across the suspension. So we actually thread it through from the front to the rear. It is actually easier to see from the back side right here. And then we were able to run it through the frame, using the wire pull. We were able to go all of the way out to the back of the vehicle. We were also able to route it through the back cross member. Our green and brown wires go over to the passenger side of our vehicle. And our yellow and brown wires will go over to the driver side. 1:02

Alright, next we will go ahead and remove the taillights of the vehicle. We will start off with the driver side and then do the passenger side. We are going to tape into our wires to install the diodes. So we will go ahead and take away the protective covering right now. We will be looking for two circuits. We will be looking for the brake circuit and the running light circuit. Now the reason we are looking for the break light circuit is that is going to do two functions for us. The break light circuit is going to do the break light, of course, and also the turn signal since it will be combined coming off of the RV. That allows us to use two less diodes and less wire splices. And the running light circuit, of course, will be dedicated to the running light. So we will test our socket. And that looks like white with a light green stripe. So that will be our running light circuit. So we will cut our wires in half, add our connectors to them and then we will install the diode in between. Now, when we install our diode, there is a label on there that say out and two inputs. Our out will always go towards the taillight. So we will slide that on. And then our input from our vehicle wire harness will go on one of the tabs. It does not matter which one. 2:05

Have somebody else hold the brake pedal. OK, that looks like a dark green wire with a white stripe. Do the same thing as before. Cut it in half and add our diode. Alright, we are going to take our wires, the yellow and brown, and we are going to pull them up from the bottom up here and connect those up to our diodes. And we will use a zip-tie to hold it in place. Then we will go ahead and shorten our wire to match up to our diodes. OK, we added our terminals to the wires. Now the yellow wire is going to be our brake and turn signal. So that will go to our diode that went to our brake signal. And then our other diode will be the running light circuit. So the brown wire will be running lights. All we have to do now is just bundle everything together. And then just reinstall the taillight and we will move over to the passenger side and do the same thing once more. 2:56

The white wire with purple stripe will be the running light circuit. And our brake signal looks like it is going to be the white wire with a light green stripe. We will go ahead and pull our green and brown wire up. We will zip-tie it off and cut it to length. Our green wire will go to our brake signal circuit. And our brown wire will go to our running light circuit. Alright, and then we will just bundle everything back up and reinstall the taillight. OK, with that that will finish our install of part number 48955.


Customer Reviews

Tail Light Isolating Diodes (Qty 4) - 48955

Average Customer Rating:  4.8 out of 5 stars   (84 Customer Reviews)


- 48955
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. 100070



- 48955
by:

Good price, reasonable shipping, arrived quickly, and work great. Only problem was that there were only 11 connectors in the package. 404071


Comments

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.

-- Laura E - 07/15/2017

26126

- 48955
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? 65139


Comments

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.

-- comment by: Jim - 02/10/2014

2761

- 48955
by:

Product works great. Thanks 649395



- 48955
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. 628086



- 48955
by:

what to say they work great got to have them 617119



- 48955
by:

Installed just fine. Great instructions. 607007



- 48955
by:

Fast Service!!! 593612



- 48955
by:

Works great 577321



- 48955
by:

Installed on my smart car and works very well. Easy to install and have had no issues. 574892



- 48955
by:

This product worked exactly as advertis ed. 568629



- 48955
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. 524236


Comments

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

Kay - 06/20/2019

56870

- 48955
by:

Excellent 520482



- 48955
by:

Working great 499843



- 48955
by:

Prefect 498580



- 48955
by:

The items were exactly as described. Excellent communication throughout the transaction. Easy install of the diodes and they perform exactly as I needed them to. Install only took about half an hour. 489284



- 48955
by:

They work just like they are supposed t o. 488887



- 48955
by:

well I ordered 5 packs of diodes and received one. they say they are going to send the missing diodes. we will see. if we receive them my review will change because they have things that are hard to find and like the convenience . 481109



- 48955
by:

Installed and working. Haven't had to think about them since. 476282



- 48955
by:

Did the trick! 465196



- 48955
by:

As discribed. A less expensive way to hook up lights for a vehicle being flat towed. Worked great. 458225



- 48955
by:

As usual, on time and exactly what I wanted. Best prices too! 453175



- 48955
by:

I first tried to purchase a diode from my local auto store. There was nothing available. they could order one for me for [more money] when I checked your product I found I could get 4 of them for less. Got them in four days. Using it to isolate my trailer from my truck. Working great! Thanks. 440831



- 48955
by:

Very happy with the product & price. Quality product. 432259



- 48955
by:

Exactly what I needed. Good pricing super service and fast delivery. 428202



- 48955
by:

Received in 3 days great service 422974



- 48955
by:

If there were a 6 star rating I would give it. Product was good, service w 414576



- 48955
by:

If there were a 6 star rating I would give it. Product was good, service w 414575



- 48955
by:

This is the perfect match, to add tail and brake lights to my tow car. Simple, fast, neat and inexpensive! 414561


Comments

Excellent, no issues

Dennis B - 08/03/2018

41886

- 48955
by:

Did not use them. Seemed to be good product but my use did not need them. 397803



- 48955
by:

Does what they say they do, no feedback to truck when toggling running lights on trailer via switch. 388964



- 48955
by:

Always have parts in Stock, good prices and always there for you. Return to etrailer.com all the time. Thank you again! 376184



- 48955
by:

reasonable shipping, fast service, have ordered multiful times 373609



- 48955
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. 337004



- 48955
by:

Never fails and works great 314786



- 48955
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. 310267



- 48955
by:

All these products were great. 309402



- 48955
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. 297072



- 48955
by:

GREAT PRODUCT . EASE OF INSTALLATION. WILL ORDER AGAIN FOR NEXT PROJECT. THANKS E-TRAILER. FAR BETTER THAN SPLICING !!!!! LEE. (THANKS GEORGE) 296898



- 48955
by:

GREAT SERVICE. EXCELLENT PRODUCT FOR THE PRICE. THANKS ETRAILER. 293751


Comments

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

LEE W - 09/13/2017

28171

- 48955
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. 275189


Comments

Okay.

John H - 07/22/2017

26446

- 48955
by:

The diodes were exactly what I needed and easily installed in my tow vehicle. The price was a lot less than Roadmaster. 248265



- 48955
by:

Wiring isolation kit used on Smart car toad. Easy to install and worked great. 244345



- 48955
by:

works good and delivered as promised 237850



- 48955
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. 225490



- 48955
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. 224255



- 48955
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. 224254



- 48955
by:

The diode connectors arrived way quicker than I thought they would. Excellent service. Thank you Tori for expediting this order, it allowed me to keep my travel plans in the RV. 221231



- 48955
by:

Just what I needed. The speed of shipping and delivery was outstanding. 217632



- 48955
by:

I haven't used the product yet, but they arrived in good shape and with fast shipping. I am extremely satisfied so far. 211175


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Ask the Experts about this Hopkins Accessories and Parts
Do you have a question about this Accessories and Part?


  • 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.
    view full answer...

  • 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...
    view full answer...

  • 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,...
    view full answer...

  • How to Separate Brake and Turn Signal Lights on a 2016 Dodge Challenger
  • In order to separate the brake and turn signal lights on your 2016 Dodge Challenger you will need a convert box that is compatible with LED lights like the Vehicle to Vehicle Tail Light Converter part # C56196. To prevent power from backfeeding into the circuits you will also need to use the Tail Light Isolating Diodes part # 48955. In order to make sure you are splicing into the correct wires, a circuit tester like part # ALL640595 will be needed. You can also use the Deka Heat Shrink...
    view full answer...

  • 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.
    view full answer...

  • Wiring Colors Explained for Tail Light Isolating Diode System # 38955
  • You are correct in everything you mentioned. The part # 48955 is just the diodes of the part # 38955. The two brown wires are running lights to either side, yellow is left turn/stop, and green is right turn stop. White is ground.
    view full answer...

  • 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.
    view full answer...

  • 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...
    view full answer...

  • 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,...
    view full answer...

  • Tail Light Wiring Functions on a 1985 Jeep CJ-7 to Install Diodes to Flat Tow Behind Motorhome
  • You will need to test the wires on your 1985 Jeep CJ-7 to determine the functions so you can install diode kit # 48955. To do this you can use a circuit tester such as # 40376 or a meter if you have one. There should be one wire that is combined left turn signal and brake light. Another that is combined right turn and stop light. And there is a running light only wire behind each tail light. It is hard to say with any certainty which color wires do each of these functions which is why...
    view full answer...

  • How to Wire a 2007 Jeep Wrangler so All Running Lights Work Front and Back When Used as Toad
  • If you want to run the lights at the front of your toad you will need to install a diode at each running power wire going into the light bulb socket. You would need extra diodes, # 48955, and you would need to splice in extra wiring, # DW02360-1. Wiring the front running lights will be similar the wiring the rear running lights, see attached photo. You will need to make sure that your towing vehicles trailer wiring is capable of handling the extra amperage required by adding the...
    view full answer...

  • 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.
    view full answer...

  • 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 #...
    view full answer...

  • 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.
    view full answer...

  • 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.
    view full answer...

  • 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.
    view full answer...

  • 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.
    view full answer...

  • 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...
    view full answer...

  • 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.
    view full answer...

  • 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...
    view full answer...

  • Replacement 4-Pole Wiring Harness for 2005 GMC Yukon XL
  • 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 # 119147KIT. 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...
    view full answer...

  • 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.
    view full answer...

  • Compatibility of Hopkins Tail Light Isolating Diodes # 48955 with 2009 Scion xB
  • You can use diodes like the # 48955. If you used the four diodes, you'd end up illuminating a single red bulb in your taillight assembly on each side, using a single bulb for running lights, turn signals and brake lights. Part # 38955 includes the same diodes, but provides a wiring harness. If you want to retain the operation of the separated tail lights of your xB, with the amber bulb for turn signals and the red bulbs for brake and running lamps, use the # 154-792-118158 kit. I've...
    view full answer...

  • How to Wire a 1996 Fiat Punto For Towing Behind a Motorhome
  • Wiring your fiat to be towed behind a RV will depend on the wiring system that is on the RV and on the Fiat. If the RV has a 4-Wire system and the Fiat has a 5-Wire system you will need the Tail Light Isolating Diode System, item # 38955. This kit will allow you to hook up the lights from the RV to the towed vehicle and will use the towed vehicles brake lights as turn signals also (see wiring diagram link). If you want to use the towed vehicles turn signal lamps also then you will need...
    view full answer...

  • Does Curt Tail Light Converter Work With LED Lights
  • Yes, the Curt 2-To-3-Wire Tail Light Converter # C56196 will work on your 2013 Dodge Charger with LED tail lights so you can separate your stop and turn signals. Please keep in mind it is recommended you use Diodes # 48955 to prevent power feedback if you are using this for flat towing; if you are only using it to convert your lights to separate the turn signals and brake lights, diodes are not necessary. I have added a link to a video review of the converter for you to check out as well.
    view full answer...


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Info for this part was:

Photos by:
Theodore B
Expert Research:
Michael L
Video Edited:
Zack K
Expert Research:
Michael H
Installed by:
Jeff D
Expert Research:
Jameson C
Expert Research:
Adam R
Updated by:
Laura H
Updated by:
Sarah W
Updated by:
Alexander C
Photos by:
Stacy F

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