Tail Light Isolating Diode System with Wiring Harness




Code: 38955


147 reviews

Our Price: $43.40

Quantity: 


Product Specs:

Tow Bar Wiring

Splices into Vehicle Wiring

Diode Kit

Tail Light Mount


Universal

Hopkins


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

Video of Tail Light Isolating Diode System with Wiring Harness


Customer Reviews

Tail Light Isolating Diode System with Wiring Harness - 38955

Average Customer Rating:  4.7 out of 5 stars   (147 Customer Reviews)

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

- 38955
by: Gary03/31/2018

This is exactly what I need Quick and easy installation Thanks etrailer. 491295



- 38955
by: Jim11/10/2018

Haven't installed the product yet- can't understand the instructions & diagram. When Hopkins having their products made in Mexico- it hurts US workers and hurts US consumers also ! I've purchased a product that I can't install, due to the vague instructions & diagram. I would appreciate it , if you would send me something that I can understand. JR 581796


Comments
I see that you are installing this kit on a 2015 Kia Soul. I have a attached a video of an installation of a diode kit on a 2015 Kia Soul. The video is for a part number that includes a coiled cable but it is the same install for the hopkins part # 38955.
-- Heather A - 11/13/2018

45691

- 38955
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



- 38955
by: Steve07/18/2020

Service is top notch. Especially Sarah !!!! Ran into a issue with someone altering OEM on current tow set up and Sarah was able to trouble shoot over the phone and sent me what I needed. Etrailer has had my business and will continue to get it. I’m using the Demco Commander tow bar and base plate on a 2017 GMC 3500. Pulling with a Damon motor home. 845619



- 38955
by: Bill D07/15/2020

Works greatly and easy to install 844218



- 38955
by: Kurt05/02/2020

Came with everything needed to wire my truck for towing behind my RV. Good quality, fast delivery and good prices....what more could you ask for! 791272



- 38955
by: Henry04/18/2020

everything worked great and couldn't be happier! 782410



- 38955
by: Bill B03/11/2020

Did all it was supposed to do. Timely shipping Priced way less than local RV shop 765137



- 38955
by: Theodore01/30/2020

This was easy to install and is working perfectly. 745845



- 38955
by: Robert10/02/2019

Product was exactly as advertised, and as I wanted. Delivered as stated. etrailer is a great company to work with. This is the second vehicle I have outfitted, and they have had great videos and directions with their products. 712044



- 38955
by: Askconc109/27/2019

Looks good when lites come on 708376



- 38955
by: charles n07/03/2019

I did not install the item myself but it was easily done and works great. 665897



- 38955
by: Rodney05/10/2019

Service was great. Follow up on my order was very helpful and appreciated. The parts were received in time to get installed on the new vehicle for our up coming trip. Would recommend etrailer to all my friends. 640431



- 38955
by: Tim F04/22/2019

Wired my Jeep for towing behind my motor home this product was great and easy to install. 634303



- 38955
by: Mike04/04/2019

Great product, no problems, works great, and good follow up 617116



- 38955
by: Nicholas01/10/2019

I wish they would have included a few extra terminals. Those things tend to break or get lost in the process, so a few more would have been nice. Instructions in the package were mostly useless, but there is plenty of documentation on the website listing. 596592



- 38955
by: Gale12/19/2018

Great product! We have towed our Jeep all over the country with no problems with this harness! I highly recommend this product! 592021



- 38955
by: Joseph09/24/2018

The installation of these wires were straight forward and easy to complete. After 1 year of use the system is still working perfectly! Highly recommended product to enable towed vehicles turn and brake lights vice separate set of lights. Set up once and no further action required. 568368



- 38955
by: Michael09/20/2018

Quick delivery, great price Already installed and works great! 567244



- 38955
by: Paul09/15/2018

I installed the product on a 2012 Chev Cruze. Very easy to do and only took a couple of hours. Lights work as expected with no surprises. Would recommend to others. 565368



- 38955
by: Michael06/29/2018

Excellent customer service from etraile r! 528277



- 38955
by: John P04/27/2018

1950 Spartan Royal Mansion. Thank you for your ongoing help and wide array of products!!! 501745



- 38955
by: Matthew04/04/2018

Wiring and diodes are high quality. Diodes are marked for ease of installation and the supplied connectors work very well. Installation directions are easy to understand. 492475



- 38955
by: Tim03/09/2018

Exactly what I needed to hook up my tow lights on my we 2001 jeep grand Cherokee limited. This kit makes it fast and easy. 483052


Comments
Still working great
Tim - 03/09/2019

50344

- 38955
by: Louie12/20/2017

Exactly what I needed. 461664


Show More Reviews
148
148


Customers compare 38955 to these similar products




VS

Roadmaster Universal Hy-Power Diode Wiring Kit




Code: rm-154


238 reviews

Our Price: $109.79

Quantity: 


Product Specs:

Tow Bar Wiring

Splices into Vehicle Wiring

Diode Kit

Tail Light Mount


Universal

Roadmaster


Diode Kit allows you to use your vehicle's tail lights and wiring system while preventing feedback from your RV. 4-Pole flat loop included to connect RV to towed car.

Video of Roadmaster Universal Hy-Power Diode Wiring Kit


Customer Reviews

Roadmaster Universal Hy-Power Diode Wiring Kit - RM-154

Average Customer Rating:  4.7 out of 5 stars   (238 Customer Reviews)

Diode Kit allows you to use your vehicle's tail lights and wiring system while preventing feedback from your RV. 4-Pole flat loop included to connect RV to towed car.

- RM-154
by: dave t12/12/2014
2014 Jeep Wrangler

I haven't installed this yet. But I know etrailer video will be of great help. 165408


Comments
So so had trouble with the connecters unplugging from the deodes. Not enough slack on my part
dave t - 12/12/2015

16159

- RM-154
by: Bill Dudley06/23/2015
2015 Jeep Wrangler

As always great customer service and delivery. I would highly recommend e trailer for all towing needs, and other products they sell. 206606


Comments
I got rid of a dolly to go with towbar, best thing Ive done so much easier to hook up and unhook than a dolly. Great product and great customer service cant beat that plus great prices.
William D - 06/22/2016

18882

- RM-154
by: Charles05/20/2018
2015 Chevrolet Silverado 1500

Work as discribed. The first time for me to use the universal kit and was a little worried about the outcome but I followed the instructions and it works great. The hardest part was routing the wire around the front end area. Wire was just enough, I recommend starting at the front end and route the wire on the passenger side. This is the side of the motorhomes 7 pin plug. Remember to stay away from the exhaust (on most trucks as mine is a Chevy 1500). Product was received within 3 days of purchase which works for me. I give Etrailer 2 thumps up for great service once again. 511182



- RM-154
by: Ed W03/18/2018
Kia

Installation on 2018 Kia Soul 486230



- RM-154
by: JOANNE B09/20/2014
2009 Chevrolet Cobalt

Received wiring within 3 days, included instructions and resource phone #s for help if needed. We will use them again when needed. 152248


Comments
Great. No problems.
JOANNE B - 09/20/2015

15111

- RM-154
by: Dave V08/09/2016
2009 Smart fortwo

I installed the wiring harness yesterday and it took about 4 hours. Thats actually 4 hours of work, in reality it was more like 6 hours but most of the time was trying to figure out how to route the wiring which is not the fault of the harness. Everything worked as advertised with no gotchya's or any issues which was really surprising. I installed it on a 2009 Smart fortwo Passion which I am towing behind my motorhome. My advice for anyone using this is take your time, read the directions carefully before you start and follow them step by step and you should have no issues. 281855


Comments
Weve put about 15,000 miles on the MHcar since installing the wiring harness and have no issues what so ever which when towing is a very welcome relief. I am very happy with your product and would highly recommend it.
Dave V - 12/12/2017

31801

- RM-154
by: Ed02/27/2019

This isn't the first time I've installed a wiring harness and this one was a nice one (I thought). But I am having problems with the right light (both brake and running light). I've tried calling and talking to your customer support with no answer! I've found if I turn on my lights, at least the running lights all work (but not the brake light or turn signal). I'm thinking it's a grounding problem, but haven't been able to fix it so may have to try someone else's wiring harness. 608773


Comments
If you click the provided link below, you can see an install video showing this wiring harness system being installed on a 2015 Jeep Cherokee. If you continue to have problems, please call our Customer Service folks at 800-298-8924.
-- Mike L - 02/28/2019

49967

- RM-154
by: Vince08/06/2020

Got excellent help from Tara to select precisely the right part for wiring my car as a towed vehicle. 856859



- RM-154
by: Clark W07/16/2020

Very easy to work with both connecting and disconnecting. Am very grateful to have it!!!!! 844555



- RM-154
by: Mike B07/11/2020

Have been using this product for a year now and it's still working great. I was able to install it with no trouble (other than having to crawl around under Jeep), but installed easily and was plug and play. Great product. 831568



- RM-154
by: Tom M07/05/2020

Very pleased with the purchase all works as expected. 828394



- RM-154
by: Ray07/01/2020

Easy to install and has worked flawless ly 825775



- RM-154
by: Stan Jernigan06/28/2020
2014 Jeep Grand Cherokee

The products purchased were to allow me to tow my new Jeep Grand Cherokee behind my motorhome. Actually I had purchased a similar setup from you Five years earlier for my 2014 Jeep Cherokee Trailhawk. Both worked as advertised and I was very satisfied. 828045



- RM-154
by: Michael06/15/2020

Again this was an installation issue. The only video is not applicable to the 2019 Ram new version. What is not clear is were do you cut into the trucks wiring. It should be made clear in the instructions. If there is a connector in line then make the splices on the truck side of the connector not the light side. 815338



- RM-154
by: Doug06/08/2020

Pretty Easy Set up with Easy to View Pictures and Videos. Works Perfectly 809433



- RM-154
by: David05/24/2020

Not too difficult to install on 2020 Jeep Wrangler Unlimited Sahara. Etrailer video helped with making the correct splices to the correct colored wires. 802805



- RM-154
by: Tom05/24/2020

Works Great 802748



- RM-154
by: Bob J05/21/2020

Easy to install. Instructions good. Works fine. 801204



- RM-154
by: Terry05/16/2020

Awesome service. Ian, the young man that helped me was super. He helped me figure out exactly what was needed for my project. The delivery of the items I ordered was right on time. Thanks etrailer for the service I received and the prompt delivery. The items I ordered was spot on. 801518



- RM-154
by: Peter H.05/13/2020

I would asbolutely buy this Roadmaster battery disconnect from etrailer.com again. I bought it in May of 2019 and had a mechanic install it. Due to a shortened travel schedule we only towed our jeep a few times and the switch failed. I called etrailer and they gave me the direct line to Roadmaster customer support who looked at a picture of the installed switch & solenoid and said it was broken because it had been wired incorrectly. They sent me a new switch, which I just installed myself. It was not difficult...and it works perfectly. Both etrailer and Roadmaster's customer support was superb. They were helpful every step of the way. I am a huge fan of both companies as a result of how they handled this transaction and follow-up. 796683



- RM-154
by: Gary05/10/2020
Chevrolet Silverado

Following the enclosed instructions and diagrams made the installation easy. It has made a big difference in my motorhome traveling while towing my Silverado pickup. No more fussing with magnetic tow lights and wiring. 794957



- RM-154
by: John R05/05/2020

Your product that you help me get the right one work prefect for our tow car and motor home combo 792913



- RM-154
by: John05/03/2020

I have always had excellent service from etrailer with very fast shipping. Anything I have every received from etrailer has always been the highest quality. 791729



- RM-154
by: Rita Rappe04/22/2020

The parts we received were of good quality. Customer service was excellent. We are very satisfied 786013



- RM-154
by: Ric04/09/2020
Ford

I purchased the Roadmaster Crossbar-Style Base Plate Kit w/ Removable Arms, The Roadmaster Nighthawk Tow Bar, Quick Disconnect Crossbar, Universal Hy-Power Diode Wiring Kit, and Roadmaster Guardian Rock Guard in order to tow my 2020 Ford Raptor behind my Class A. Everything bolted on beautifully and the craftsmanship was fantastic. Ordering from etrailer was easy and the parts arrived within a few days with no problem. I watched numerous [online] videos to learn how to install everything and they saved me a lot of time. Overall, I'm very happy. 777655


Show More Reviews
241
241


Customers compare rm-154 to these similar products





Ask the Experts about this Roadmaster Tow Bar Wiring


  • Comparing Roadmaster RM-154 and Blue Ox BX8848 Flat Towing Diode Kits
  • The Roadmaster hardwired diode kit # RM-154 for flat towing a car will not differ much from a similar kit from another maker, such as Blue Ox kit # BX8848. But since the Roadmaster kit includes a protective wire loom and has been highly-rated by many more users, I would opt for the Roadmaster kit # RM-154. I linked a series of helpful articles concerning tow bar wiring options as well as installation videos for both kits.
    view full answer...

  • Comparing the Various Wiring Options to Flat Tow a 2012 Honda CR-V
  • First, if you are going to be towing the CR-V frequently a more permanent solution for lighting is more ideal. The bulb and socket kit would be my first choice (# RM-155) because you do not have to cut into the vehicle wiring and it is easier to install. If you do not want to drill into the back of the tail light housing but are not opposed to tapping into the vehicle wiring, you can use a diode kit # 154-792-118158. I have included a link to the installation instructions for you to...
    view full answer...