Allows motorhome or R.V. to power the lights on the towed vehicle without power feedback. Lowest Prices for the best Tow Bar Wiring from Hopkins. Tail Light Isolating Diode System with Wiring Harness part number 38955 can be ordered online at or call 800-298-8924 for expert service.

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Tow Bar Wiring > Splices into Vehicle Wiring > Diode Kit > Universal > Tail Light Mount > Hopkins

Tail Light Isolating Diode System with Wiring Harness

Hopkins Tow Bar Wiring

(82 reviews)

Code:   38955



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Shipping Weight: 1.52 pounds


Hopkins Tow Bar Wiring - 38955

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


  • Includes 4-pole flat trailer connector.
  • Max amperage per diode: 3 amps
  • Max voltage: 24 volts
  • Wire lead: 35' long
    • White ground wire measures 42" long.
  • Wire configuration:
    • Brown: Left side running lights
    • Small green wire: Right side running lights
    • Yellow: Left side turn and brake lights
    • Thick green wire: Right side turn and brake lights


Please note - 3 wire system on towed vehicle: If the towing vehicle has a 3 wire system, where the brake signal is sent along a separate wire from the turn signals, then a wiring converter (118158) and 2 additional diodes are needed to retain separate amber turn signals. If you only use this diode kit (38955), then the vehicle brake lights will function as brake and turn lights.





38955 Tail Light Isolating Diode System with Wiring Harness

Video of Tail Light Isolating Diode System with Wiring Harness

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

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Video Transcript for Tail Light Isolating Diode System Demonstration

This part is for a vehicle to vehicle towing kit. What this basically does is, say you have an RV or motor home or pickup truck and youre going to towing another vehicle on all four wheels youre going to need this wiring harness to make the lights on the towed vehicle work with the towing vehicle. Well start by showing you the different components of this kit, its really pretty simple if you break it down. First the connection here is a traditional four pole flat. So you have your four basic signals, your ground, running lights, left turn and right turn. You also have plenty of harness to attach this on the towed vehicle. When you make your connections on the towed vehicle itself, you have to install these diodes here. At the point where you make your connections on your vehicle whether it be your left or right turn or the running light circuit you will have to install these diodes.

To give you a couple of quick notes about these, what happens is they do go in a specific direction in the wiring harness. to keep it simple basically the single prong here is listed as out, that goes onto the taillight itself out to the bulb. Then you get the two inputs here, one of the inputs is going to be the wire you just cut because youre going to splice this in between the two. It does not matter which one, the wire is going to come in one side and out the other. This other pin here is going to provide input from your trailer harness coming from the towing vehicle itself. So for instance you would take your green wire here and run it to the other open end and it will go out and power your taillight being towed down the road by the RV. As you can see theres 4 diodes and theres a reason for that. Theres going to be one for the left and right turns, and both turn signals are going to have there accompanying running lights. So youre going to need a diode for each of the running lights. Now weve opened up a small bag of parts which contains all the spade connectors needed to do the install. Basically what these are, you cut your wire that you need and you splice the wire back and expose about a quarter inch or so of it and these get crimped on. Be sure you have the right tool to do that with because it makes all the difference in the world with a tight connection and loose connection. Once you do that, it just slides onto the diode prong itself. You may also want to invest in some dielectric grease that will protect it and keep things out that would cause corrosion which would eventually cause an open circuit. As one final note you may want to take into account, if your towed vehicle has the same turn signal and brake light bulb, this kit is for you. If you have separate stop lights and turn signals, say for example your turn signals are amber that means theres going to be a different box to achieve that so you have your separate turn signals and stop lights still the same. That covers part # 38955.

Customer Reviews

Tail Light Isolating Diode System with Wiring Harness - 38955

Average Customer Rating:  4.7 out of 5 stars   (82 Customer Reviews)

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

- 38955

by: Charles S.07/09/2013

This is exactly what I needed to complete my tow package for the RV. I have seen for several years RVs towing a toad and always liked the idea of having the toad vehicle tail lights work from the RV. The diodes were easy to install and the spades fit tight. Instructions were clear even fo rthis old guy. Delivery was spot on with several emails communicating to me what was going on with the order. Thanks a bunch! :) 88444


It has been a year and after returning from vacation after the 4th I am very pleased to express my satisfaction with the diodes I installed on my Jeep wrangler. I get asked all the time how I was able to get the tail lights to come on while towing. I am always eager to tell and show everyone. What a great product. Still working GREAT!

Charles S - 07/09/2014


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by: Sandy Snowden03/02/2015

The weekend after receiving your Diode Kit, I went to work on my wife’s 2015 Trax. The hardest part of the whole project was running the harness from the engine compartment to the tail lights. The first thing I did was to attach the ground lead (white) to the negative terminal of the battery (it has a small bolt next to the main terminal for this purpose). After that, it was very easy to hook-up the diodes with the hardware included. The Trax actually has four separate lights, turn signal, brake, backup and running lights. I chose the light which had three wires going to it (red, green and black). One of the wires went to the running light filament, and one went to a brake light filament. The black wire was a ground, which I did not need. After the wiring was complete, this one light served as running, turn and brake. I secured them within the tail light assembly with duct tape and the project was finished. After connecting the trailer, everything worked perfectly. I’m very pleased with this product. Sandy Snowden, Katy, Tx. 176567

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by: Bill Springer11/21/2012

Got the kit installed. Using on my toad (RAM Dakota) to be pulled behind my motorhome. My first one like this and easy and good quality product. Highly recommend. 59891


All is doing fine thanks.

Bill S - 05/22/2014


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by: linwood m08/28/2011

installed your isolating diode wiring harness 38955 also the blue ox base plate bx1126 . install was very easy with video on your site.was installed on my 2007 wangler to be towed with holiday rambler motor home. 22966

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by: arthur03/08/2013

exactly what i ordered. 69708


works great,was easy to install.

arthur - 09/06/2014


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by: Allan A.11/17/2011

The product arrived as expected & on time, with plenty of instructions and even a measure of product installation “Difficulty Rating”. I diffidently would use this measure to determine if I need help or could do it myself. Thanks for your excellent response time and “World Class Customer Service”. A.A. 27067

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by: Joe G11/22/2011

Installed the wiring kit on my 2008 Smart car. The Diode pack was exactly what I needed and made the installation simple and very clean. The kit was 100% complete in every way with more than enough wire to do the job. Thanks for a great product and at a price that made it practical. 27314

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by: Paul P11/04/2013

The delivery was prompt and the packaging was excellent. The product is exactly like the picture. I would recommend this site to all that are shopping for this product. The only reason that I gave the product a 4 star vs a 5 star is that the plug that hangs in front of your vehicle does not have a cover to protect it from corrosion. What you see is exactly what you get. I would buy from this dealer again. 106166

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by: David B10/25/2013

Product contains everything a do-it-yourself handyman requires to completely wire a vehicle's existing lights for towing. The rate limiting part of this project is deciding how and where to run the wires from the front of the vehicle to the tail lights. The actual wiring of the lights requires about 15-20 minutes. Now I don't have to use the magnetic tow lights and string the wire through the vehicle. Thank you. 105205

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by: Terry02/24/2013

The product arrived as promised and all components seem of good quality. I was apparently shorted, I don't think I dropped or lost it, one spade lug which required an extra trip to the hardware store. It would be nice if a couple of extra lugs were included incase one gets lost or messed up during install. Other than that, all worked fine as promised after install. 67591

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by: Eldon02/28/2013

The product is now installed and works great. The instructions were sketchy (they were literally a sketch!) but I was able to muddle through it. Instructions did not call for the signal light wires to actually connect to the (separate) signal lights which I have on my Geo Tracker. When I rewired it this way everything worked fine. 67929

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by: Earl Cook01/24/2012

The product arrived in three days in very good condition. Installation went well, the video is a great help. I suggest that a longer ground wire be installed. I was required to add some length to it to make compatible with roadmaster tow bar to my motorhome. All in all a good product. Earl Cook 30239

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by: John B06/13/2013

Everything I needed was included in the kit. An online video showed the installation steps very clearly. The wire provided was long enough for any vehicle. I had 6-8ft leftover after installation in my Dakota quad cab truck. Experience level: Above average (retired engineer) 84390

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by: James B.06/11/2012

Delivery was prompt and product performs as advertised. The only difficulty was with the crimp-on spade terminals which are too large for the harness wire. It was necessary to solder the cable ends to make them slightly larger to get a tight crimped connection. 43688

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by: Charles08/28/2014

The order shipped very fast. I installed the wiring kit with not problems. I liked having 35 ft of wire, it gives you lots of choice of where to run the wire. The kit I got has 2 brown wires for park lights so I did not have to run a jumper. 149090

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by: Glen01/16/2012

Good product. Fast shipping. Components were sent as described. A quick install guide shipped with the product would have been helpful. Had to go back and search online for install instructions. 29790

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by: Larry M.02/03/2014

Ordered this diode harness and was surprised how fast it was shipped. Instructions are easy to understand and should be installed without problems. It will solve my tow car lighting. 115552

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by: Doug S.07/08/2011

The ground wire is way too short. I had to add afew feet to it. This product is used by RV'ers and the towed car is going to be at least 5 feet behind the motorhome connection point. 18949

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by: Bernie K06/28/2014

Easy to order and quick shipment. Items received as specified in the online product description. Thank you for the detailed installation instruction that i got from your website. 138139

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by: Mark W.12/20/2013

My order was processed and in the mail with great speed,when it arrived it was just as pictured with good clear instructions.I am very pleased and would recommend them to everyone. 110727

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by: Eldon12/20/2013

I havn't installed or used the product but the service was EXCELLENT! It was shipped the day it was ordered and delivered two days later, great service for the Christmas season. 110688

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by: Gene F05/30/2011

Tow bar brakets were correct ones and in excellent condition. They were delivered on time. I have ordered from E Trailer three times; each time have been completely satisfied. 15686

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by: Ronj S10/07/2013

On-line instructions were perfect. Installation a breeze. Only suggestion I have is to include a couple of extra connectors in the package. Raise the price a buck if need be. 102860

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by: Gene T.02/29/2012

Product was exactly as advertised. Pictures were exact representative of the wiring system. Delivery was reasonably prompt. Will definitely be a returning customer. thanks 32800

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by: JR01/30/2015

I used this kit to wire 1987 Jeep Wrangler for towing behind my motorhome! It worked perfectly and was relatively easy to install! I am very pleased with the product. 171938

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by: Donavon K.12/10/2014

It was excellent and all the quality I would expect. Shipping was also fast and efficient and this is my second order and I have been pleased in both orders. 164110

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by: M.A.C.09/23/2014

This product was super easy to install, my total installation time was about 2.5 hours on my Explorer Sport Trac. you won't find a better product or price. 152731

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by: Dennis03/05/2013

The products were exactly what I needed and were of a very good quality. The service was fast and hassle free. I would recommend this business to anyone. 68899

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by: chuck s10/29/2012

Easy install. Good instructions, plenty of wire length for my application (Mazda Miata). Worked perfectly first try and we are pleased with the result. 58349

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by: chris04/23/2012

Excellent product - better than the product was the professional support and help. These people take support seriously. would recommend to anyone. 38130

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by: Tom G08/06/2013

Everything I ordered was received and packed extremely well. Great service and the product is what was advertised. Thai you so much! Tom G 93566

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by: John C06/23/2012

The diodes and wiring harness that you sent me were just as discribe and just what I needed. Thank you very much for your promped service. 45378

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by: Gordo01/20/2011

Diodes Installed with minimal issues. I only needed 2 Diodes for my Jeep, but I'll hold on to the extras.. Seems to be a good product! 5741

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by: George W.11/11/2014

This was exactly what I needed to wire my 04 Chevy Tracker to my RV. It was relatively easy to install through my frame rails. 160372

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by: Don Clarke06/27/2012

Thank you for your service and quick shipment of the diodes and wiring.Your directions on line explain a great deal of detail. 45821

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by: Joe02/16/2013

Well pleased with service and wiring harness I ordered from your company. Great price, fast delivery, very easy to install. 66560

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by: John B.05/10/2011

The harness arrived in a timely manor. It was straight forward to install and worked perfectly. I'm a satisfied customer. 13292

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by: Dave P05/13/2011

The diode wiring kit was fairly easy to install. The instructions were good and everything was delivered very quickly. 13813

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by: Dave Shannon08/01/2011

Nice and simple, good directions on the website. Fast order processing and shipping, very happy. Thanks again guys. 20745

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by: Bill11/03/2014

works as presented. need to order the pig tail for between the towed vehicle and the coach as it is not included. 158994

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by: Dave H.03/31/2014

Arrived super quick, even with standard shipping. Product looks just like the pictures. Haven't installed yet. 122987

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by: Michael02/07/2012

The kit is complete with easy to follow instructions. I have purchased from etrailer before and will do so again. 31298

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by: Donald03/18/2013

Just finished installing. Haven't had a chance to towe with it yet but went in just like I expected. 71295

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by: Rod05/11/2011

Product worked as advertised. What was great was great was the detailed installation directions. 13353

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by: Bernie S09/30/2013

Seemed to be just what I need for vehicle. Ran a copy of instructions since none came with kit 101999

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by: Dustin W12/17/2010

diode kit Exactly what I needed at a great price. Product is as advertised and good quality. 4282

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by: Layne01/31/2013

Excellent value for the money. By using this kit and doing it myself I saved over $200. 64665

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by: Viento111/19/2013

Prompt delivery of my order. Instructions appear complete. Haven't installed it yet. 107853

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by: John C Lane10/03/2011

Excellent service--excellent product---very easy install--- excellent in every way! 24990

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by: Ralph G.02/03/2012

I installed the wiring harness on my vehicle like the video showed it works great. 31019

Show More Reviews

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  • Tow Bar Base Plates and Wiring for 1999 Jeep Grand Cherokee
  • The 1419-5 base plate kit and the RM-037 Blue Ox to Roadmaster Adapter are the correct parts for your Grand Cherokee. We do not carry Blue Ox products at this time, but we have many options for wiring your Cherokee for towing. For infrequent towing, many find the magnetic towing lights, part # C-ATL20A work well. The benefit of this system is easy installation, and the fact that the lights remain completely independent from the wiring system of the towed vehicle. The next option is the...
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  • Parts Needed to Tow a 2009 Hyundai Elantra Behind a Motor Home
  • To begin, you will need to install base plate kit # 521627-1 on your 2009 Hyundai Elantra Touring. The Roadmaster Falcon all-terrain tow bar # RM-522 would be a good choice for your application, as it is rated to tow up to 6,000lbs and is easy to hook up on uneven ground. I would recommend Roadmaster Universal Hy-Power Diode Wiring Kit # RM-154 to wire your RV and vehicle for towing. The # RM-154 page shows some wiring diagrams that should be helpful for your installation. If...
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  • Will Supplemental Braking System and Tow Bar Wiring from RV Overload Brake Lights on Toyota Tacoma
  • Both a brake light signal from the motor home and the brake signal from the vehicle are 12 volt systems. If both are supplying power at the same time to the same circuit it would not overload it because it would not double up the power to 24 volts. You may need a brake light relay # RM-88400 to keep the Tacoma brake signal from overriding the turn signal sent by your RV. The relay is needed on towed cars with combined lighting if you are using a supplemental braking system. Combined...
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  • Base Plates, Tow Bar, Wiring, Safety Cables, Braking System to Flat Tow a 2005 Mazda Miata
  • To flat tow your 2005 Mazda Miata you would first need Roadmaster XL Base Plates, # 711-4, that you have referenced. Please note these base plates will not fit the Mazdaspeed version of the Miata. Next, you would need a tow bar compatible with the XL style base plates, like the RoadMaster Falcon 2, # RM-520. I have included a link to the installation details and a video review for reference. To complete the towing set up for your Miata, you will need safety cables, lighting, and a supplemental...
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  • How to Add a 4-Way Flat Connector to the Roadmaster Falcon Towing Combo Kit
  • The Roadmaster Falcon towing combo kit, # RM-9243-2, includes the round 4 pin trailer connector only. For a 4 pin flat connector, we offer the Tail Light Isolating Diode System with Wiring Harness from Hopkins, part # 38955. We have some videos that you might find helpful during the installation process, I will provide links below.
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  • Blue Ox Base Plates for 2002 Jeep Wrangler
  • The Roadmaster Base Plate to Blue Ox Tow Bar Adapter, part # RM-033 is not included with the Blue Ox Acclaim Tow Bar. You would only need the adapter if your Jeep is already equipped with the Roadmaster Base Plates. If you do not yet have the base plates for your Jeep, we now carry Blue Ox base plates. For a C-channel bumper, use base plate part # BX1118, or # BX1120 for a double-tube bumper. When possible, it is best to use a tow bar and base plate from the same manufacturer. If...
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  • Tow Bar for a 1991 Geo Tracker
  • Yes, the Roadmaster Tracker Tow Bar, product number RM-020, will work with your base plate and your vehicle. If you also need to wire the vehicle for towing, products number 38955 and 118158 will take care of those needs. I will attach links to the above referenced products and available videos for your review.
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Info for this part was:

Test Fit:
Joe V

Expert Research:
Michael L

Video Edited:
Zack K

Video by:
Andrew K

Expert Research:
Robert G

Expert Research:
Patrick B

Expert Research:
Michael H

Expert Research:
Jameson C

Video Edited:
Joshua S

Updated by:
Adele M

Expert Research:
Adam R

Video Edited:
Mike H

Updated by:
Laura H

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