1. Accessories and Parts
  2. Roadmaster
  3. Tow Bar Wiring
  4. Diodes
Roadmaster Hy-Power Diode - (Qty 1)

Roadmaster Hy-Power Diode - (Qty 1)

Item # RM-790
lowest price pledge
Retail:$25.99
Our Price: $14.18
You Save: 45%
Accessories and Parts
Orders above $99 qualify for Free Shipping
Shipping Weight: 0.07 lbs
Quantity: 
In Stock
zoom in icon
zoom out icon
Comment field cannot be left empty.
Name field cannot be left empty.

Thank you! Your comment has been submitted successfully. You should be able to view your question/comment here within a few days.

Error submitting comment. Please try again momentarily.

Product Images

Videos

Diodes permit electrical current to flow in only one direction - from the motorhome to the car - prevents electrical feedback and the damage it can cause to the towed car's electrical components. Call 800-298-8924 to order Roadmaster accessories and parts part number RM-790 or order online at etrailer.com. Free expert support on all Roadmaster products. Guaranteed Lowest Price and Fastest Shipping for Roadmaster Hy-Power Diode - (Qty 1). Accessories and Parts reviews from real customers.
  • All Info
  • Reviews (119)
  • Q & A (72)
  • Videos (1)
  • Photos
  • Why etrailer?

Roadmaster Accessories and Parts - RM-790

  • Tow Bar Wiring
  • Diodes
  • Roadmaster

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


Features:

  • Diodes permit electrical current to flow in only one direction - from the motorhome to the car
    • Enables trouble free operation of your towed vehicle lights
    • Prevents damage to your towed vehicle's electrical components
  • Maximum load per diode: 85 amps at 12 volts
  • Includes detailed wiring instructions
  • Qty: (1) Diodes
  • Made in the USA



Note: 4 Diodes are required for most applications (1 left turn/brake, 1 right turn/brake, 2 for tail lights - each side).




790 Roadmaster Hy-Power Diode





Video of Roadmaster Hy-Power Diode - (Qty 1)

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




Video Transcript for Review of Roadmaster Tow Bar Wiring Diode - RM-790


Customer Reviews

Roadmaster Hy-Power Diode - (Qty 1) - RM-790

Average Customer Rating:  4.9 out of 5 stars   (119 Customer Reviews)

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

- RM-790
by:

I needed to charge my tow vehicle battery by taping in to my tail lights on my motor home. This will prevent The tail lights on the tow vehicle from feeding from its own battery. My break buddy was depleting the tow vehicle battery on long trips. Solved my problem! 524458


Comments
Working great, no problems
Jon l - 06/20/2019

56873

- RM-790
by:

Ordered a diode for a project on my RV and it worked out fine. I just wish the price was much cheaper for such a small part. 402096


Comments
Ok
Jim - 07/06/2018

40570

- RM-790
by:

This handy item allowed me to wire up my rear bumper flush mount lights to power on with my reverse lights and also power on from a switch. Very handy! 768435



- RM-790
by:

Easy to install. Took awhile for me to understand installation but working well a year later 751598



- RM-790
by:

I am in awe how quickly this order was processed and delivered. Considering it had to clear Canadian customs and I ordered on a Friday , it was in my hands on Wednesday. Megan was very helpful on the phone in locating the correct parts ,processing the order and following up with tracking info. I had also chat online prior to placing the order with Mackenzie who answered all questions effectively. Combining all this with the fact etrailer has very detailed instructions with drawings on the installation and I am beyond impressed. It isn’t often we see customer service on this caliber today. As a consumer I will definitely be using them again! Oh yeah and the product needed was in stock whereas when I ordered from a well known online site (A...n) in September and told ETA would be Nov/Dec they couldn’t even deliver in that timeline? 729438



- RM-790
by:

I bought all Roadmaster parts for my tow car. ALL worked as advertised(GREAT) I thought about a 4 star because slow delivery but you all were helpful. 621601



- RM-790
by:

So far so good 614214



- RM-790
by:

Good product works well one leg to camper batttery one leg from truck to camper batteries 610816



- RM-790
by:

Diode was delivered promptly and was a good transaction, Very pleased with the service 606072



- RM-790
by:

Used on spray equipment wiring to run a foamer with an on/off/on (L-R) switch. Had to eliminate a feedback loop with a high amp diode to run an actuator, this item fit the bill very nicely. 576776



- RM-790
by:

Fits perfectly and works great without overheating. 571395



- RM-790
by:

I bought these electrical products for my brother‘s Fiat that he tows behind his moterhome for extra parts haven’t had to use them yet but it’s good to know that etrailer Corp. has the parts thanks George J. 570830



- RM-790
by:

glad we could find it here. 554841



- RM-790
by:

Excellent service. 521452



- RM-790
by:

I was amazed to learn that similar to plumbing, you can put a one way valve in a 12 volt wire as well. One of my batteries was not being charged when our RV was plugged in and to make sure I did not run down my engine battery I installed this diode. Simple and came with connections ready to be hooked up. Arrived pretty quickly too. That you Christina J for one on one over the phone help. 500181



- RM-790
by:

Just installed it. I think it’s working. I like that the spade terminals are included. 493819



- RM-790
by:

Works great!!! 493044



- RM-790
by:

has worked great. 478527



- RM-790
by:

Put it in a snowmobile trailer with a battery and hook the clearance light wire with the one way diode & then to the interior lights so if someone leaves the lights on in the trailer we can still start the pickup when we get back from a 3 day ride 477933



- RM-790
by:

Nice item, problem solved with my auxiliary lights on the rear of my pickup, lights now work off two switches and no feed back either source. Can put truck in reverse and it doesn't feed power back to switch or i can manually turn them on from the switch and no back feed to my reverse lights. Was nice that it came with butt connectors even tho i have all the electrical connectors, didn't have to search for any. Liked how you can put two power source in and it goes out to one and didn't have to buy two diodes one for each side like traditional diodes. All around nice product and well made. Sorry didn't have a pic to post with it didn't feel like pulling taillight back out. 472833



- RM-790
by:

This is a little premature to give a product rating. I will say that the diods iordered arrived sooner than expected. After reviewing the options for wiring a vehicle to be towed behind a mtrhome this is the way to process. Thank you, Jim 464083



- RM-790
by:

Just what I was looking for small and compact also 463406



- RM-790
by:

Bought this so I could install backup lights on my trailer and also be able to use them as loading light. This has worked out great. I have also purchased several other items from etrailer and have been happy with all of them. 454001


Comments
After a year this Diode has ben flawless works great for my application.
JAMES S - 11/21/2018

45910

- RM-790
by:

Used diode in wiring dingy battery to RV to keep it charged while towing - worked great. 450358



- RM-790
by:

Works just like I expected it to. 442633


25
123
Show More Reviews

Ask the Experts about this Roadmaster Accessories and Parts




  • Why etrailer.com?

    At etrailer.com we guarantee:
  • Highest quality accessories and parts for the best price.

    Our Lowest Price Pledge ensures you will never overpay for the parts you need.
  • Real product know-how.

    We make sure that the products we sell are what we say they are, and that they work the way they are supposed to work. Get real advice from a real person who has the knowledge and expertise needed to solve your problem.
  • Most detailed, accurate accessories and part information available.

    Because we take providing accurate product information seriously, we take our own detailed product photos, demo videos and installation videos, as well as verify measurements, instructions, and vehicle fit information.
  • Installations, made easy.

    We love helping people and have the most highly-trained customer service, hands-on experience, step by step videos and installation instructions.
  • Fast shipping.

    Your order is automatically routed to get out of our warehouse and to your door as quickly as possible. Receive free shipping on orders over $99.
  • Personalized service for life.

    We provide one-on-one, personalized service from the ordering process through the life of your product.
  • Trusted since 1946.

    We've been serving customers since our parts store first opened in 1946 and continue to be recognized by our customers, our vendors and third parties for exceptional service.
  • Returns Policy

    Need to return an item? No problem. Please read our Returns Policy for more information.

Info for this part was:

Expert Research:
Robert G
Expert Research:
Michael H
Expert Research:
Jameson C
Expert Research:
Adam R
Installed by:
Jeff D
Installed by:
Cole B
Updated by:
Hannah L
Updated by:
Mike S
Updated by:
Noah M

At etrailer.com we provide the best information available about the products we sell. We take the quality of our information seriously so that you can get the right part the first time.