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Roadmaster Hy-Power Diodes (Qty 4)

Roadmaster Hy-Power Diodes (Qty 4)

Item # RM-794
Our Price: $51.94
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Accessories and Parts RM-794 - Diodes - Roadmaster
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  • Reviews (272)
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Roadmaster Accessories and Parts - RM-794

  • Tow Bar Wiring
  • Diodes
  • Roadmaster

Roadmaster Hy-Power Diodes

Diodes permit electrical current to flow in only one direction - from the motorhome to the car - preventing electrical feedback and the damage it can cause to the towed car's electrical components.


  • Qty: (4) Diodes
  • Reduces wiring hassles
  • Trouble free operation
  • Includes detailed wiring instructions
  • Maximum load is 85 amps per diode

794 Roadmaster Hy-Power Diodes

Video of Roadmaster Hy-Power Diodes (Qty 4)

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

Video Transcript for Roadmaster Tow Bar Wiring RM-794 Review

Speaker 1: Today we're going to take a look at the Roadmaster heavy duty Hy-Power diodes for a quantity of four. Now, this will allow motor homes or RVs to power the lights on the tow vehicle without power feedback. The diodes will permit electrical current to flow in only one direction, from the motor home to the car, preventing any electrical feedback and the damage that it can cause to the tow car's electrical components.This part is for a quantity of four diodes with the 12 spade terminals included to hook this up. It is a heat sink design on the diode and this does reduce wiring hassles. It's a trouble-free operation. It does include detail wiring instructions on the back here, and the maximum load is 85 amps per diode.

That should do it for the review on the Roadmaster heavy duty Hy-Power diodes for a quantity of four.

Customer Satisfaction Score:

Customer Reviews

Roadmaster Hy-Power Diodes (Qty 4) - RM-794

Average Customer Rating:  4.9 out of 5 stars   (272 Customer Reviews)


These things worked perfectly for my needs. I used one on my 4500 Chevy Kodiak air compressor for the air ride seats. I wanted to be able to turn the compressor on/off without starting the truck, and still have it run when the ignition switch is on. These diodes allow that to happen. I also plan to add one to control the reverse lights. It will allow me to use the reverse lights when I load things in the nighttime without having to start the truck and put it in reverse.


The diodes are great, but the wiring term. should be weather seal type.


I have used these in the past so when i got a new tow vehicle i bought them again.
They make wiring up the lights on a tow vehicle a snap. I have never had one fail.

Travis S.


still working good


Works as expected. Only problem plugging electric to car sometimes not so great .Overall the Sterling setup is wonderful .

Gary S.


Worked great as it should ,some times plug elec.lines not so good


delivered on time


I installed these diodes on my wifes 2006 VW Jetta TDI to isolate the signal and tail light system from my tow vehicle. The system works as planned and the quality of the parts are excellent!

VW/Audi products are notorious for system glitches when you drive the stock lights with a tow vehicle. I routed standalone wires from the front bumper mounted bulkhead plug to the rear of the car down the inside of the drivers side rocker panel and into the trunk area.


Great product and awesome service!


i installed this product in my golf cart because when i have to load the golf cart onto the trailer to take it to get repaired i can connect the golf cart to the truck and the trailer lights to the connecter at the back of the golf cart so that all the lights work


I have been using these type of diodes since Aug 2021 installed (by me) in our 2015 Chevy Silverado 1500. The diodes have worked well.


Always a pleasure to work with this company. And this time Alyssa was big help. Thank you.


easy to install


Diodes work as designed. They eliminate additional lights and prevent the need to drill a hole in the tail light assembly. I used these on a previous vehicle and they are still problem free after eight years.


perfect for my project -- using to tie flood lamps to rear of fire apparatus to use in conjunction with back up lamps and separately use the floodlights to be switched at the back of the apparatus


The base plate is easy to use and looks great on our MKX. The installation videos are very detailed and precise.


Easy to install in-line of your towed vehicle. Use your toad's own lighting and eliminate magnet sets or additional lighting installs. As easy as wiring a trailer. Make towing your toad as simple as possible. You owe it to yourself.


I've used this product several times over the years and found the best price for this quality product here at The service was great with fast shipping and no damage to my items.

I'll definitely buy for them again.

Tom D.
Grants Pass, Oregon


Shipping was fast, product worked as ad vertised.


This was much easier than I anticipated. The instruction video of my car was exactly my model and clearly showed every step. Even my wire colors were all exactly the same in the video. I’m impressed.


Fair price, delivered as agreed on time. Would buy again from this vendor.
Only reason I did not give this five stars is that I have yet to actually hook them up in the wiring system to enable my factory lights on the towed vehicle to be operational when taken on a trip behind my RV.


Roadmaster makes great quality products, and Stacey A is great to work with!


Installing Baseplate an wire tailites for towinginstructions were great,the plate fit very good. The diodes work fine but wireing a ford edge for towing was hard an room for the diodes back of the tailites was very limited .I would very highly recomend your products


Wired up 2012 Jeep JKU for towing behind RV. These 4 diodes worked perfectly! Watched trailer video, it was easy.


This is a solid product. The package had sufficient instructions for installation by someone who had never installed the diodes before.


These little beauties perform exactly as described. e trailer is a great company to deal with. I highly recommend them!


Exactly what I needed for my Ram 2021 Truck to flat tow

Show More Reviews

See what our Experts say about this Roadmaster Accessories and Parts

  • Will Roadmaster Hy-Power Diodes Work With LED Lights Of 2019 Jeep Wrangler
    The Roadmaster Hy-Power Diodes (Qty 4) part # RM-794 will work perfectly with the LED tail lights of your 2019 Jeep JL. If you are planning on flat towing the Jeep you may consider Roadmaster Diode 7-Wire to 6-Wire Flexo-Coil Wiring Kit part # RM-15267 which comes with the diodes, a 6-way plug for the front of the Jeep and a coiled cord to connect the Jeep to the motor home for a nice clean installation.
    view full answer...
  • Are Diodes Required for Tow Bar Lighting Harness for 2018 Jeep JL Wrangler
    If you have a plug and play tow bar lighting harness that fits your 2018 Jeep JL Wrangler you would not need additional diodes and you'd be good to go as-is. Now if you have a plug and play trailer wiring harness you should note that these cannot be used in reverse as tow bar lighting so you would need to go with a lighting kit like the Roadmaster # RM-15267.
    view full answer...
  • Replacement Roadmaster Diode Recommendation
    Part number # RM-794 is for 4 diodes, so while it would work for you a better option would be to order a quantity of 3 of the part # RM-790 as that is a single diode.
    view full answer...
  • What is the Voltage and Amperage Rating for Roadmaster Diodes
    Roadmaster diode # RM-790 is rated for a maximum of 24 volts and 85 amps. So you can use it on a 12 or 24 volt system as long as the amperage draw does not exceed 85 amps. At 30 volts that would exceed the rated capacity of the diode and eventually you would have to replace the diode if the voltage was sustained over 24 volts long enough and/or frequent enough.
    view full answer...
  • Are Diodes Needed For Installing Roadmaster InvisiBrake on Jeep Wrangler
    Appreciate the purchase and yes, you will need diodes for your Jeep Wrangler when installing the Roadmaster InvisiBrake Supplemental Braking System # RM-8700. Per Roadmaster, even with a plug-in wiring harness like you have, you would still need to install diodes, and for that use the Roadmaster Hy-Power Diodes # RM-794.
    view full answer...
  • Replacement Diodes for Roadmaster Diode Kit
    You can replace the diodes from the Roadmaster Hy-Power Diode Kit # RM-152 with the Roadmaster Hy-Power Diodes (Qty 4) # RM-794, which come in a pack of 4.
    view full answer...
  • Can 2013 Fiat 500 with Separate Taillights be Wired for Flat Towing with Diodes for Combined
    Your situation is a very common one and the solution you proposed is the easiest and most popular solution. Like you mentioned you'd be wiring up the separate taillights to function like combined ones. You'd need a total of 4 diodes which we have that as a 4 pack with part # RM-794. I attached the correct diagram you'd need to use for your application.
    view full answer...
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  • Difference Between Roadmaster Hy-Power Diodes # RM-792 and # RM-794
    The only difference between the Roadmaster Hy-Power Diodes # RM-792 and # RM-794 is the quantity of diodes included with the kit. The # RM-792 includes two diodes while the part # RM-792 includes four. Otherwise the diodes themselves are exactly the same. I have attached a short video review below that you can check out as well.
    view full answer...
  • Replacement Diode to Use on a 1999 Jeep Grand Cherokee
    If you were needing a single diode then you are looking for part # RM-790, if you need a set of diodes then it will be # RM-792. If you are needing to use 4 diodes, the part is # RM-794.
    view full answer...
  • 2013 Jeep Wrangler Turn Signals Stop Flashing When Being Flat Towed
    The Roadmaster FuseMaster Fuse Bypass # RM76511 is not vehicle-specific so it can work on a Wrangler but I do not believe that would be the solution to your issue. It sounds to me like you are in need of diodes; I looked up the harness you referred to and while it is similar to something like the Roadmaster Diode 7-Wire to 6-Wire Flexo-Coil Wiring Kit # RM-15267, your harness did not seem to include diodes like the Roadmaster kit. What it sounds like is happening is there is electrical...
    view full answer...
  • Where Do Diodes Splice In When Installing Diode Wiring In A 2016 Jeep Wrangler JKU I al
    We don't carry Cool Tech products so I can't tell you for sure how their products work. The URL you pasted didn't work so I couldn't find the harness you purchased but I looked over their website and it looks like all of their flat towing harnesses are a plug and play factory connector style wiring harness and wouldn't require diodes. If your harness is different I would need to know the exact part number to take a look at it. Typically diodes like part # RM-794 get installed just before...
    view full answer...
  • Diode Kit Recommendation for Installing Hopkins Tow Bar Wiring on Vehicle with InvisiBrake
    The # RM-794 would be the correct kit to install the Hopkins Wiring Harness part # HM56007 in your 2012 Ford Focus with the Invisibrake part # RM-8700. I attached a diagram of how it will install as well.
    view full answer...
    Image 1 for
  • Do Diodes Need to be Replaced for Roadmaster Wiring Kit # RM-154 on a 2015 Jeep Grand Cherokee
    If you are using the Roadmaster Universal Hy-Power Diode Wiring Kit # RM-154 then I have some steps you can take to see what is wrong. It could very well be the diodes that you are using. Try using your tester on the wiring right before it enters the diodes if you are getting a signal before they enter the diodes but not a signal afterwards then you need to replace the diodes with part # RM-794. Another possibility is that the wiring itself is bad. You can use the Wesbar # W002230 to...
    view full answer...
  • Where to Install Diodes when Installing Roadmaster Invisibrake with Tow Bar Lighting
    If you check out the picture I attached you will see where to install the diodes on your vehicle to install both the Roadmaster InvisiBrake Supplemental Braking System # RM-8700 and the part # HM56304 that you referenced. For a diode kit you would want the part # RM-794.
    view full answer...
    Image 1 for
  • Is Using The Hy-Power Roadmaster Diodes Better or Worse Than The Smart Diodes on 2021 Chevy Colorado
    First the biggest difference is the cost of the Hy-Power Diodes # RM-794 being more price conscious than the Roadmaster Smart Diodes # RO34FR. The Hy-Power diodes will also allow you to tie into the 2 separate functions on the incandescent bulb where the smart diodes only have one output and regulates power going into the single function of the incandescent bulb. So if this filament inside the bulb were to fail neither light would work where as with the Hy-Power if the brake/turn filament...
    view full answer...
  • Connector and Diagram to Convert UK Land Rover Defender to US 7-Way Trailer Connector
    Yes, we do have a diagram you can reference when installing a US-style 7-Way on your Land Rover Defender, like the Hopkins Endurance # HM47210. I'm attaching a photo showing the pin-out for a US 7-Way and I'll be linking our helpful article that goes into this with a little more depth. Please note that vehicle wiring in the UK tends to be separated out a lot more than in the US so you may end up needing to use some other parts like the Roadmaster Hy-Power Diodes # RM-794 as well. We...
    view full answer...
    Image 1 for
  • Maximum Amp Rating of Roadmaster Hy-Power Diode
    The Roadmaster Hy-Power Diode # RM-790 is rated for a maximum of 85 amps. This is for a single diode but is also available in different quantities if you need: - Quantity of 1: Roadmaster Hy-Power Diode # RM-790 - Quantity of 2: Roadmaster Hy-Power Diode # RM-792 - Quantity of 3: Roadmaster Hy-Power Diode # RM-793 - Quantity of 4: Roadmaster Hy-Power Diode # RM-794 I have added links to video reviews for you to check out as well.
    view full answer...
  • Does Roadmaster Hy-Power Diode Have Any Voltage Drop
    The Roadmaster Hy-Power Diodes haven't been tested for voltage drop since they are designed to be a pass-thru device that just keeps backfeeding from happening. When I reached out to my contact at Roadmaster they said that the voltage drop would be very minimal if anything. I like the Hy-Power Diodes because of how durable and effective they are. You can get this diode in a handful of qunatities: 1 - # RM-790 2 - # RM-792 3 - # RM-793 4 - # RM-794
    view full answer...
  • Tow Bar Wiring For 2009 Chevrolet Silverado
    If you want single diodes we have the Roadmaster diodes, you can buy separate. Roadmaster Hy-Power Diodes (Qty 4) # RM-794. Roadmaster Hy-Power Diode - (Qty 1) # RM-790. If you want a diode kit for flat towing we do have kits, I recommend the following: Tow Ready Tail Light Isolating Diode System with 4-Pole Connector # TR118821. Roadmaster Universal Hy-Power Diode Wiring Kit # RM-154. These both will work on your specific vehicle.
    view full answer...
  • Flat Tow Wiring Kit Compatible with 2005 Honda Pilot
    The TowDaddy Custom Tail Light Wiring Kit for Towed Vehicles # TD3018 is not a fit for your 2005 Honda Pilot. TowDaddy was acquired by Hopkins, but they no longer make these harnesses and I do not recommend them. Hopkins does make some custom wiring connection harnesses but unfortunately they do not make one for your Pilot. For a better alternative I recommend the Roadmaster Diode 7-Wire to 6-Wire Flexo-Coil Wiring Kit # RM-15267 or the Roadmaster Universal Hy-Power Diode Wiring Kit...
    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...
  • Does my Tow Bar Wiring Harness Require the use of Hy-Power Diodes
    Wherever you use the RV to signal the vehicle's factory lights, diodes will be needed to stop the backflow of electricity. If you are using a set of external lights like part # TL21RK then the diodes will not be needed but since you have the wiring harness attached to your factory lights then you will want to use a set of diodes like part # RM-794. I have attached a diode installation help article for you to take a look at as well.
    view full answer...
  • Diode Kit for Flat Towing 2012 Ford Focus
    We do have flat towing diode kits for the various versions of the 2012 Ford Focus, such as # RM-154, that you can see on the linked page. You can use the Select Vehicle Style drop-down menu bar at the top of the page to choose your Focus and then see suitable kits. We also have individual diodes # RM-790 and # RM-690 as well as 2-pack # RM-792 and 4-pack # RM-794. All of these come with spade terminals that accept wire leads.
    view full answer...
  • Wiring a Trailer Towed Behind a Motorcycle for Single LED Taillights
    On your motorcycle the taillight circuit is a separate lighting signal, this means that the brake light is on a different circuit than the turn signal. If you were wanting taillights for your trailer with only one light and in an LED configuration you would need to install a taillight converter and then you can install the taillights of your choice. The Hopkins Tail Light Converter # HM48895 is compatible with LED taillights. This converter will hard-wire into the motorcycle wiring and...
    view full answer...

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