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  1. Tow Bar Wiring
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FITS 2002 GMC Sierra
Roadmaster 6-Diode Universal Wiring Kit for Towed Vehicles with Separate Lighting

Roadmaster 6-Diode Universal Wiring Kit for Towed Vehicles with Separate Lighting

Item # 154-792-118158
Our Price: $188.08
Tow Bar Wiring
Confirmed to Fit
2002 GMC Sierra

1500

3500

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Roadmaster Tow Bar Wiring - 154-792-118158
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The best technical support and full tow bar wiring installation instructions. Great price Sierra tow bar wiring and expert service. GMC Sierra, 2002 tow bar wiring by Roadmaster are available from etrailer.com. For expert service call 1-800-940-8924 to order your Roadmaster 6-Diode Universal Wiring Kit for Towed Vehicles with Separate Lighting part number 154-792-118158, or order online at etrailer.com.
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2002 GMC Sierra - Roadmaster 6-Diode Universal Wiring Kit for Towed Vehicles with Separate Lighting

  • Diode Kit
  • Splices into Vehicle Wiring
  • Tail Light Mount
  • Universal
  • Roadmaster

Connect your towed car's lighting system to your RV's to get the brake lights and turn signals required for towing. Designed for use with GMC Sierras that have separate brake and turn signals. 4-Pole flat loop and wiring converter included.


Features:

  • Connects your RV's tail, brake and turn signal lights to your towed vehicle's lighting system
    • Designed for use on towed vehicles that have a 3-wire system (separate brake and turn signals)
  • Prevents electrical feedback and the damage it can cause to your towed car's electrical components
  • Includes tail light converter to adapt your RV's 2-wire system (combined brake and turn signals) to work with the towed car's 3-wire system
  • Contains everything you need to wire your car for flat towing
    • 6 Hy-Power diodes
    • Tail light converter
    • 30' Long strand of 4-wire electrical cord
    • 6' Long cord with 4-way flat connectors - both vehicle and RV ends
    • Ring terminal and wire connectors
    • 3' Long split-wire loom
  • Limited Lifetime Warranty


Specs:

  • Max amperage: 85 amps
  • Max voltage: 24 V


Note: If your RV has separate brake and turn signal lights, you do not need to install the included tail light converter. However, you will need to replace the 4-way vehicle-side connector with one that is capable of carrying the separate signals.


The diagram below shows the installation of the 6-diode tail light wiring kit on a towed vehicle (or dinghy) that has separate turn signals (typically amber) and red brake lights. This kit will most often be used with a motor home that operates off of a 2-wire system wherein the brake lights do the flashing for the turn signals. The included tail light converter (118158) is used to convert the combined brake and turn signal lights to separate ones to match those of your towed vehicle.


Six-Diode Kit



154 and 792 Roadmaster Universal Wiring Kit with 6 Hy-Power Diodes and 118158 Tow Ready Tail Light Converter

Installation Details 154-792-118158 Installation instructions

Customer Satisfaction Score:


Customer Reviews

Roadmaster 6-Diode Universal Wiring Kit for Towed Vehicles with Separate Lighting - 154-792-118158

Average Customer Rating:  4.8 out of 5 stars   (53 Customer Reviews)

Connect your towed car's lighting system to your RV's to get the brake lights and turn signals required for towing. Designed for use with vehicles that have separate brake and turn signals. 4-Pole flat loop and wiring converter included.

by:
Subaru Outback Wagon

In ordering the parts I got a little confused as to exactly which kit I needed. My motorhome has combined brake/turn signal lights & the car ('03 Subaru Outback) has separate brake/turn/parking lights. Thought I needed the 6 diode kit (which I ordered) until I had all the parts here & read through the instructions for the umpteenth time (BEFORE cutting anything) & then realized what they were doing. Turns out all I needed was the 4 diode kit. Sounds like there won't be any problems returning the unneeded parts since they were never installed. Great service there!
Took a lot apart in the back of the car because of the lack of space behind the tail light assemblies, but it all comes apart pretty easily. Also allowed me to route the wiring along side the stock harness. Have a bunch of 1/2" split loom here & used it.
Thought I would have lots of wire left over, but I actually had to splice 2 cut offs to make a jumper long enough to get from 1 side of the car to the other. Glad the car wasn't any longer & I didn't have to make up 2 jumpers as with some of the kits!
Hardest part was finding a hole in the firewall & getting the harness routed under the dash so as to not tangle with the pedals, etc. I just don't flex like I used to.
Everything works fine although it was NOT a "5 minute job".



by:
Chevrolet Volt

The diodes and wiring are good and worked well. But the 118158 converter produced a 3.5 volt drop such that the brake lights were as dim as the tail lights. And when a turn signal was triggered the brake lights dimmed even further. I ended up stringing a separate brake wire through the car and re-wiring my truck with a 5-wire connector.



by:
2013 Honda CR-V

Prompt deliver of product. We haven't gotten this part of our project installed, we are still watching YouTube videos and other info on procedure. Had very little difficulties installing base plate on our 2013 CRV this should go well also. Our lights are a little more complicated but once we figure out how to actually wire to them every thing we've learned so far is very straight forward.

Jerry B.

2/2/2015

So far, so good. Weve only towed the car one way from KS to Fl. Everything working great. Thinking about adding a receiver hitch but, will take it to the dealer as we sold our farm, and our tools and have the grandsons arent available to do the hard work.



by:
2012 Ford Five Hundred

I used this wiring kit on a 2012 Fiat 500 Sport. All of the components worked as advertised and I am really pleased with the result. I used the 6 diode kit so the FIAT's turn signals would work the same when it's being towed as when it is driven.

This was my first light wiring kit installation and it was quite a challenge on the small FIAT to fish the flat cable from the rear of the car to the front. I ran it along the drivers side - over the rear wheel well, along the rocker panel, and up over the front wheel well. The wheel wells were the most difficult part of the job. Running the cable from driver's side to passenger side along the rear bumper and running it from the front wheel well to the front of the car and installing a connector were straightforward.

One problem I ran into is the female disconnect terminals supplied with the kit that are used to connect wires to the diodes anticipated a thicker wire (16-14 AWG) than what the FIAT uses. A quick trip to a close by big box store was all that was needed to find the same connectors for a thinner gauge wire (22-18 AWG). You still use the supplied disconnect terminals with the flat cable connections to the diodes.



by:
Honda

I bought this wiring kit because I wanted to wire my 2013 Honda CRV myself. E-Trailer has a video that is helpful in its installation . What I later found out was you need to route the wires through some covers underneath the vehicle and unless you have some means to raise the vehicle pretty high that routing will be difficult. I went to the Honda dealer and several other auto places and no one would install this kit for me because of liability reasons so now I have a product of question. I ended up at a friends garage who had a lift and we routed the wire from side to side and from front to back in about 20 minutes. Once secured in place I took the car home to finish the diode installation. Using the video it was easy to install. The only problem I had was putting the rear tai lights back in. You will need the separate the diodes as the space between the body and light housing is very close. Other than that everything worked out well.



by:
Ford Ranger

Install on a 2020 Ford Ranger. The product was excellent. The only problem I had was trying to remove the nuts holding the front bumper on. Ford has these bolts embedded in a hard plastic frame that spaces the three bolts on each side. In trying to remove the nuts I got them started then they would neither come on off nor reinstall. The nuts were spinning the bolts. After thinking about the fix I was in I decided to cut the factory bolts off and replace them with 1/2" x 1 1/2" bolts with fender washers. I tried a sawsall with a metal cutting blade and the bolts ate the teeth right off. I put on a Milwaukee thick metal cutting carbide tooth blade and that did the trick. Other than that, which is Ford's fault, everything went as the etrailer videos showed. If you are doing this make sure to spray the exposed bolt threads with WD-40 or something like before you try to remove the nuts.



by:
Toyota Tacoma

I used the wiring harness on my Tacoma pickup in preparing to tow it behind our 40’ motorhome. The harness went on easily from the front grill to the rear lights, where I soldered and heat wrapped each connection. The instructions were ample and easy to follow.
It’s been a year since the installation, and the wiring has worked flawlessly!



by:
Honda Civic

The Roadmaster Wiring Harness was installed easily by our mechanic and works perfectly with our Civic and RV. I'm certain we will use etrailer.com for our new dinghy towing requirements!



by:
2013 Honda Fit

An ingenious system that enables a combined break and turn signal set up on your RV to properly operate the separate turn signal / brake setup of your toad. Beautiful!

Dale H.

6/28/2021

Have been using the brake and turn signal system for over a year now, and it is still working flawlessly!!



by:
2013 Chevrolet Sonic

I found the product to be of very high guality. I did not supply pictures as I would need to remove my taillights again. I had to covert a motor home that did not have separate turn signals to a Sonic that did. The materials supplied allowed me to just that. I do have two other comments-The instructions showed the wires on the car on the passenger side which is opposite from the Sonic and most others I would think. I had to reverse my thinking to do the correct procedure. Also, could you not supply unit specific instructions if the towing vehicle lighting arrangement and the towed vehicle was identified. This would eliminate the extra parts that I did not need and help the customer complete the task. Other than that, very good product. I guess it is better to have extra parts ratter than not having enough but I just thought this might cut the cost for some applications.



by:
2012 Kia Sportage

This harness was an excellent choice. It took about an hour and fifteen minutes to install. Everything is spelled out for you in the instructions and if all else fails, watch the online video. The hardest thing was removing the tail light on the Sportage. I has a ball joint connection that forces you to pull harder than you think you should. I was afraid I would break the light. But it popped out and the rest was easy. Very complete and works great! The connections fit like factory. Very Pleased.



by:
2005 Subaru Forester

I did a lot of research before buying. etrailer's prices and support are above average. I ordered the Roadmaster 913-1 baseplate, Falcon-2 towbar and 154 universal lighting kit. I was completely surprised by the fast shipping, all parts arrived 3 days before I expected AND the shipping was free!

Before I ordered I talked with etrailer support to ensure I ordered the correct parts. They were knowledgeable and helpful.



by:

This is my second purchase of wiring kit for towed vehicle I have bought from Etrailer. I had some questions and Etrailer was able to answer every question I had. I will go back to Etrailer next time I need products such as this.



by:

The wiring works great, I got more in the KIT than I could possible use and I am sure I had to pay for the extras, but I got what I needed and am very happy.

Alex A.

11/8/2017

it is doing great



by:

Was skeptical about using with led tail lights,but it all went well. The installation videos are spot on. After one year and about 12k miles traveled, no problems. My vehicle is a 2020 Ford Ranger.



by:

Works as advertised. Design of these wiring kits is based on converting the common 3 bulb brake/turn signal systems to a 2 bulb system. This makes them unnecessarily complicated.



by:
2015 Fiat 500

The kit contained all you need to wire lights on a Fiat. The instructions were clear and concise. Excellent product and service as usual for etrailer.

Ron B.

5/25/2018

After one year this kit is still doing its job flawlessly.



by:
2010 Suzuki Grand Vitara

A great product. Installed easily. Previous wiring experience would be good for somebody wanting to use this.
It has performed flawlessly over the past year. I’d recommend it.

David

10/28/2018

Fantastic. No problems at all. Works as required every time I plug in.



by:
2008 Honda Fit

Very complete, hi quality, reasonably priced kit for lighting my "toad". If you have combined lights on your RV and separate lights (brake and turn) on your "toad", this is the kit.



by:

Product arrived on time.Online videos very well done.Katie D. provided excellent customer service on all the parts ordered.

Wayne S.

6/11/2016

very happy with product still working without any problems



by:
Ford

I ordered a towbar and accessories through the Internet site. It was very easy and also very informative. The supplies were ordered and I receive them in a couple of days. It was a great price and I did much research before I ordered. We are planning to install the towbar on our Ford C-Max and tow it with our phoenix cruiser 3100.



by:

Customer service was the best. Product delivered as expected. I recommend this wiring package. My towing safety comes first and Etrailer delivered.



by:

Nice set up. Instructions were spot on. The hardest part of the installation was removing car interior panels to get to the wiring. Would definitely recommend this product.



by:
2010 Kia Soul

Pretty darn quick on the shipping. Easy instructions, 2010 KIA Soul easy install, lots of spare space for the diodes and splitter box. Had all the wiring installed, tested in just under 2 hours.



by:

Contained everything I required except the independent stop light switch.


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Show More Reviews

See what our Experts say about this Roadmaster Tow Bar Wiring

  • Function Of Vehicle to Vehicle Taillight Converter # 118158 When Towing Vehicle With Separate Wiring
    The instructions that are included with the Roadmaster 6-Diode Universal Wiring Kit, part # 154-792-118158, detail how to wire a separate towed vehicle from a separate motorhome. The # 118158 instructions show how to wire the converter that takes the combined signal from the motorhome and when it senses the pulse from the turn signal being used, sends that signal to the wire for the turn signal out of the converter and attached to the appropriate wire on the trailer. I have attached a...
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  • Troubleshoot Vehicle Taillights Not Working with Tow Bar Diode Kit Installed When Plugged into RV
    When you plug the tow bar wiring # 154-792-118158 into your tow vehicle the diodes of the kit will prevent the Jeep from having control of them if the signal from the tow vehicle is being applied. This is a function of the diodes designed to prevent the circuit from backfeeding onto the vehicle's wiring circuits. If they are not working at all with the tow vehicle plugged in you will want to first verify that all the connections you made are secure. After that use a circuit tester to test...
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  • Can Roadmaster Diode Tow Bar Lighting Kit # 154-792-118158 Activate Vehicle Third Brake Light
    Yes, if you wanted the Roadmaster trailer wiring diode kit part # 154-792-118158 to activate the third brake light of your vehicle you would just need to run the red wire to the third brake light and it activate the third brake light.
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  • Recommended Tow Bar Wiring For 2015 Ford Explorer
    We do offer tow bar wiring that is designed to fit the 2015 Ford Explorer. I recommend the Roadmaster Tow Bar Wiring Kit, part # 154-792-118158. This kit is designed to work with your 2015 Ford Explorer with the separate lighting system. This kit includes the converter that will adapt an RV 2-wire system to work with the Explorer separate lighting system. I have attached a wiring diagram you can check out. I have also attached a link to an installation video for this kit. It is on a different...
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  • Are Extra Diodes Required for Installing Custom Wiring Harness on a 2009 Grand Vitara
    The TrailerMate custom wiring is set up as a combined wiring system, so it will use the main red lights on your vehicle for both brake lights and turn signals. You could think of this as being comparable to hard wiring with 4 diodes. This kit would allow you to have turn signals while towing the vehicle, but it will not use the separate turn signal bulb. The turn signals would work normally when you are not towing the 2009 Suzuki Grand Vitara. If you do want the separate turn signal...
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  • Is Cable to Connect Motorhome and Flat-Towed Vehicle Included in Diode Kit # 154-792-118158
    The Roadmaster Tow Bar Wiring Kit # 154-792-118158 that you referenced includes all required diodes, connectors and wiring to set up your Honda Fit for flat towing. The longest cable in the kit, the 30-foot flat connector harness, will run from the rear of the Fit up to the front of the car; it should be positioned near the center of the vehicle to avoid being pulled when the motorhome turns. This 4-pole is where the toad and motorhome will connect to each other. I have included links...
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  • How Does the Roadmaster 6-Diode Wiring Kit for Towed Vehicles Stop the Back-flow of Electricity
    The Roadmaster 6-Diode Universal Wiring Kit for Towed Vehicles with Separate Lighting part # 154-792-118158 which is an excellent option for a flat-towed vehicle will not cause any issues. In regards to compatibility with a supplemental braking system, this won't be an issue at all. The towed vehicle won't send voltage up to tow vehicle because the above kit has diodes which stop the back-flow of electricity therefore it can only flow one way which is from the tow vehicle to the towed vehicle.
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  • Troubleshooting Wiring Ground Connection From Towing Vehicle to Towed Vehicle Installation
    The Roadmaster 6-Diode Universal Wiring Kit for Towed Vehicles with Separate Lighting # 154-792-118158 does need to be grounded to the vehicle chassis at both locations. Without a solid metal to metal ground, the converter and the trailer wiring may not function properly. It is possible they could work being tied together and connected into the towing vehicle ground through the 4-way wiring harness, but that is putting a lot of faith in your tow vehicle ground connection and the gauge...
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  • Troubleshooting Tow Bar Wiring, Toad Vehicle Left Turn/Stop Not Functioning
    It sounds like the problem is the ground of the left stop/turn light you have on your RV. If this circuit has a weak ground or signal it will prevent the toad's taillight from functioning as well. Check the circuit on your tow vehicle for a weak ground or possible shorts and fix as necessary. Once you get the tow vehicle's taillights working again the toad vehicle's should work again. Check all connections between the tow bar lighting and the factory taillight circuits on the tow vehicle...
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  • Does Converter in 6-Diode Tow Bar Wiring Kit Prevent Back Feeding Installed on 2014 Chevy Sonic
    The converter contained in diode kit # 154-792-118158 offers minimal at best protection against backfeeding. That is one of the purposes of the included diodes. A drop in voltage can also be attributed to the length of the wiring it has to travel and the resistance change when adding tow bar wiring like a diode kit. Provided the lights operate correctly once the kit is installed, a slight voltage drop, though expected, should not prevent the system from working properly. I do recommend...
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  • Flat Towing a 1990 Suzuki Samurai With Separate Tail Light Wiring
    The long and short of it is your 1990 Suzuki Samurai has turn signals and brake lights on a different circuit. This is a common issue when flat towing, and the solution for you is going to be using the 6-Diode Universal Wiring Kit for Towed Vehicles with Separate Lighting # 154-792-118158, which has the converter you'll need to wire. Please look at the help article I've attached on wiring a dinghy and follow the second procedure. This will outline all the steps you will need to take to...
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  • Does Roadmaster 6 Diode Tow Bar Lighting Kit Fit 2018 Ford Taurus
    Yes, the Roadmaster 6-Diode Universal Wiring Kit # 154-792-118158 that you referenced will fit and work well for your setup. We confirmed with Roadmaster that the kit is a fit for your 2018 Ford Taurus and it is designed to work with LED taillights so you are good in that regard as well.
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  • Tow Bar Wiring For 2017 Fiat 500 Pop
    For your 2017 Fiat 500 Pop, the Roadmaster 6-Diode Universal Wiring Kit for Towed Vehicles with Separate Lighting # 154-792-118158 is a confirmed fit. This kit will allow you to use the amber turn signal on the towed vehicle for those vehicles that have separate brake and amber turn signal lights. If you need more recommendations for flat towing your Fiat, let me know and I'd be happy to give you a complete setup recommendation.
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  • Tow Bar Wiring System to have Separate Turn Signals and Brake Lights on 2017 Buick Envision
    Legally the dingy lights don't have to have separate brake lights and turn signals but you can certainly wire it up that way if you want. I do not know which lighting system you have but the whole kit for separate dingy lights is # 154-792-118158. If you already have a 4 diode kit then you will just need 2 additional diodes # RM-792 and converter # 118158. I have included a diagram showing how the 6 diode system wires up. If you have something other than a 4 diode kit let me know what...
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  • Best Location to Wire a Tail Light Isolating Diode System
    The diodes in the Roadmaster 6-diode wiring kit # 154-792-118158 will be installed after the converter # 118158 (included in the Roadmaster 6-diode wiring kit) when using this kit. The easiest place to install the diodes is right behind the tail light assemblies where the wiring is easily accessible. I included a couple helpful articles, video review and a picture for you to view.
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  • Diode Wiring Solutions for a Flat Towing a 1991 Suzuki Samarai
    From the research I did it looks like you have a separate tail light circuit. Which means your turn signals and brake lights are carried on separate circuits. The easiest way to install diodes on your setup would be to use 4 diodes and have it so that the tail lights of your 1991 Suzuki Samarai will operate as a combined circuit, so basically your current brake lights will perform the turn signal and brake light functions. Check out the picture I attached that shows how the 4 diodes of...
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  • Tow Bar Wiring Recommendation for a 2015 GMC Canyon
    You can wire up the tow vehicle so that the taillights function like a combined system (2 wire), which requires a 4 diode kit. Or you can wire up your vehicle like a separate system where you would use a 6 diode kit. For a 4 diode kit you would want the # RM-154 or for a 6 diode kit you would want the # 154-792-118158. I attached an FAQ on wiring up the vehicle in either configuration for you to check out as well.
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  • Diode Tow Bar Wiring Installation Instructions for a Separate Wired Vehicle
    You have two options for wiring a vehicle like your 1988 VW Cabriolet for diode style tow bar wiring. You can wire up the tow vehicle so that the taillights function like a combined system (2 wire), which in this case you would want a 4 diode kit. Or you can wire up your vehicle like a separate system where you would use a 6 diode kit. For a 4 diode kit you would want the # RM-154 or for a 6 diode kit you would want the # 154-792-118158. I attached an FAQ on wiring up the vehicle in either...
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  • How to Connect Diode Wiring Kit for Flat Towing a 2005 Jeep Grand Cherokee
    Yes, you would just wire the green and yellow stop/turn brake circuits from the Roadmaster Universal Hy-Power Diode Wiring Kit # RM-154 to your brake lights on your 2004 Jeep Grand Cherokee. If you want to utilize your amber turn signals on your Jeep while flat towing you can use the Wiring Kit # 154-792-118158 instead which comes with a converter and the extra diodes you need to separate your brake and turn signals. I have attached photos of both wiring options for you to reference.
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  • Do The Towed Vehicle's Turns Signals Get Used With the Roadmaster Hy-Power Diode Kit
    The Roadmaster Universal Hy-Power Diode Wiring Kit part # RM-154 will use the brake light bulb to display both the brake and turn signal circuits. The turn signal bulb will then not be used while the vehicle is in tow but it would still work as normal while driving the vehicle. That said, if you want to use the turn signal bulbs on the vehicle while in tow all you need to do is use the Roadmaster 6-Diode Universal Wiring Kit for Towed Vehicles with Separate Lighting part # 154-792-118158...
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  • Wiring Kit Recommendation To Operate 2005 Jeep Liberty Lights While Being Flat-Towed
    When you are flat-towing your 2005 Jeep Liberty behind your RV, the wiring kit I recommend is the etrailer Tow Bar Wiring, part # 154-792-118158. This connects the brake and tail lights, as well as the turn signals from your RV to the Liberty's lighting system. The kit includes everything needed to complete the installation. I have attached a drawing that shows how this wiring kit is installed you can check out. When working with electrical connectors I recommend using dielectric grease...
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  • Are Roadmaster Kit Diodes and Wiring Converter for Isolated Stop Lamp Available Individually?
    The Vehicle to Vehicle Tail Light Converter # 118158 is absolutely available apart from the Roadmaster 6-Diode Universal Wiring Kit for Towed Vehicles with Separate Lighting # 154-792-118158. Then for the additional diodes you need beyond what you currently have you will use the Roadmaster Hy-Power Diode - (Qty 1) # RM-790 or package of 2 # RM-792. The prices are on each product summary linked or on the individual product pages.
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  • Availability of Wiring Kit For Separate Brake/Turn Signals on 2003 Chevy Tracker Towed By Motorhome
    You will need to use the Roadmaster 6-Diode Universal Wiring Kit, part # 154-792-118158, on your 2003 Chevrolet Tracker that is being flat towed by your Airstream motor home. This kit will give you everything you will need to convert the combined brake and turn signals on your motor home to separate brake and turn signals that is on your Tracker. I am including a link to the installation instructions on the wiring kit. I also sell the diodes separately in quantities from 1 to 4. I am...
    view full answer...
  • Turn and Brake Lights Do Not Work Using 6-Diode Kit and Converter for Towing a 2012 Cadillac SRX
    It sounds like you have a good grasp on the installation of the Roadmaster 6-Diode Universal Wiring Kit, # 154-792-118158, and you have already gone through a few troubleshooting steps, so I would recommend troubleshooting the converter box from the # 118158 wiring harness. Installing the # 118158 wiring harness at the front of your 2012 Cadillac SRX instead of closer to the taillights is not a problem. To troubleshoot the converter box of this wiring harness, I would first recommend...
    view full answer...


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