/
Roadmaster/
Tow Bar Wiring/
DiodesItem # RM-790
Retail:$19.99
Our Price: $15.95
You Save: 20%Orders above $99 qualify for Free Shipping
Roadmaster Hy-Power Diode
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.
Features:
Note: 4 Diodes are required for most applications (1 left turn/brake, 1 right turn/brake, 2 for tail lights - each side).
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.
Today we're going to take a look at the Roadmaster High Power Diode for a quantity of one. Now this diode will allow your motor home or RV to power the lights on your towed vehicle without power feedback.The diode's will permit electrical current to flow in one direction, from the motor home to the car, preventing any electrical feedback and the damage that can cause to the towed car's electrical components. Now this part is for a quantity of one diode. It is available in a variety of quantities, so you can get a one pack, a two pack, a three pack, or even a four pack, and all options are available at etrailer.com.For the one pack like this one, you use part number RM-790, a two pack would be RM-792, a three pack would be RM-793, and the four pack would be the RM-794.Now this does reduce wiring hassles. The spade connectors right here allow for easy trouble-free wiring connections and the aluminum heat seek design on this style, it helps prevent overheating. On the very back it has a self stick pad that you can peel on that allows for easy and secure mounting.
Maximum load on this is six amps at 12 volts per diode and one note on this is usually four diodes are required for most applications, one for the left turn and brake, one for the right turn and brake, and then two for the taillights, one on each side.But that should do it for the review on the Roadmaster High Power Diode for a quantity of one.
Average Customer Rating: 4.9 out of 5 stars (106 Customer Reviews)
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
Working great, no problems
Jon l - 06/20/2019Just what I wanted. Looked in all the local auto stores with no luck. Came in two days. Works great. 314746
Works just like I expected it to. 442633
Needed to set up a circuit to activate my reverse lights on the trailer to light up the loading ramp. This worked great to keep the power from backfeeding into the car. 148921
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
Ok
Jim - 07/06/2018This 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
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
has worked great. 478527
I ordered the product to install in my 2014 VW. The next morning I got a call that what I had ordered would not ship right away and they told me if I didn't mind they could put everything I needed together and ship it right out. The he asked what I was going to use this for and It happened to be what I needed.i installed it today and it works great. 177040
What I like about your business is the fast fulfillment and delivery of the part i ordered. I will recommend etrailer in the future. 173141
Fantastic. The advice received from E-Trailer was perfect. The Diode was exactly what I needed. Small, inexpensive, and very effective. The adhesive back and included connectors couldn't have been a better fit. Needed this to prevent backfeeding of a Motorcycle Lift Battery in my pickup from powering the truck. Truck required a disconnect of the negative battery cable before towing behind a motorhome. 332628
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
I needed these to wire a TOAD (tow vehicle). They have worked as advertised. The plus is that they are quality products. The con is that they are not cheap. 264095
Over a year and still working well. High quality.
Ron - 06/23/2017Using this to trigger a 12V device if one or both 12V sources are on. Essentially I need to turn off a device if my engines are running. I wanted to make sure that if one engine was not running it would still trigger the device. This worked perfectly because it isolated the input sources so there is no conflict when both 12V inputs are on. Lots of uses, sturdy construction - simply perfect! 254347
This diode was easily installed and functions extremely well, as do all of the products we have purchased from etrailer.com. etrailer's extremely competitive prices, their outstanding customer service, and their free, quick delivery make them our go to company for all of our towing needs. 143778
The products are performing perfectly!
George C - 07/31/2015We love the equipment that we purchased from you. We have had no issues with towing our Miata.Thank you for your correspondence.
George C - 08/04/2015I always have trouble receiving deliveries because I have a postal address that doesn't accept FedEx or UPS and a physical address that doesn't accept USPS. The website doesn't specify the shipping method, so I sent a note to customer service. The rep personally oversaw my shipment so that I got it quickly and at the right destination. It's that kind of service that keeps me coming back to etrailer.com 246724
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
So far so good 614214
Good product works well one leg to camper batttery one leg from truck to camper batteries 610816
Diode was delivered promptly and was a good transaction, Very pleased with the service 606072
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
Fits perfectly and works great without overheating. 571395
glad we could find it here. 554841
Excellent service. 521452
Just installed it. I think it’s working. I like that the spade terminals are included. 493819
Works great!!! 493044
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
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
Just what I was looking for small and compact also 463406
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
After a year this Diode has ben flawless works great for my application.
JAMES S - 11/21/2018Used diode in wiring dingy battery to RV to keep it charged while towing - worked great. 450358
Shipping was prompt as usual. The diode is working as it should. 426440
Needed a heavy duty diode I found it works great!!! 411074
I used this diode to connect a 12v line from my coach battery to the battery on my CR-V. It helps to keep the CR-V battery from discharging while towing. 396952
prompt delivery and low cost for a high amperage diode device. 382824
Worked great; exactly what I needed to prevent current back feed and any voltage drop. 377225
Worked as described. Very useful for what I was doing. Thanks 345660
good product, works as expected Thanks 336330
I ordered a diode. It shipped right away. Very happy with the service. 335103
Product works as described. Easy to install with no issues. 265565
works great 262946
Shipped fast. Could not find a local auto parts store that would sell only one of the diodes at a time. Thanks for being there! 217610
Product worked great,as intended. Staff from etrailer was very helpful in getting the correct part and on time. Will use them again. 54206
Diodes were delivered fast, just when I needed them. My mechanic installed them today. Hopefully, they will work as good as they look. 9771
Very easy to use. It was easy to install and has worked great. 2246
Review from a similar Roadmaster Hy-Power in Accessories and Parts
Installed 6 of these to wire up my 04 Honda CR-V as a Toad. They work great so far, lights come on from either the CR-V or the RV. Nice that they come with the terminal lugs so all you have to do is strip and crimp the wires. 223175
Review from a similar Roadmaster Hy-Power in Accessories and Parts
I purchase these to set up my toad (CR-V) with the Road master 7 to 6 wiring kit along with the 2 back into 3 wire module to allow for me the use the turn signal lights (Yellow) operate separately from the brake lights so that the toad lights all work as they were set up by the manufacturer. This way also allows you to avoid having to buy the brake light relay if your vehicle brake lights are energized by the mechanical function of your braking system. Your overall cost is relative and as stated all of your lights work instead of the typical stop/tail/turn signal bulb on each side. 655651
Review from a similar Roadmaster Hy-Power in Accessories and Parts
Good product with excellent service! I can now use my reverse lights as work lights without back feeding my truck. Works great to correct those who have a have a habit of driving behind you with high beams on.... 232182
Review from a similar Roadmaster Hy-Power in Accessories and Parts
Not too big so fitted in tight space well. Found crimps supplied on the loose side. Used other type which were more secure. Replacing the diodes l fitted earlier l found the problem l was looking for. Cable soldered joint. So now l,m all set for a while. This diode set looks very robust. 396322
Review from a similar Roadmaster Hy-Power in Accessories and Parts
I just installed them and they work as they should. I was isolating lighting on an equipment trailer for a brake and turn circuit. Now it does not backfeed. 517440
Ask the Experts about this Roadmaster Accessories and Parts
At etrailer.com we guarantee:
Info for this part was:
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.
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.