In-stock alternatives that are ready to ship
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:
Note: 4 Diodes are required for most applications (1 left turn/brake, 1 right turn/brake, 2 for tail lights - each side).
Videos are provided as a guide only. Refer to manufacturer installation instructions and specs for complete information.
Jeff: Hello everybody. This is Jeff at etrailer.com. Today, we're going to take a look at this Roadmaster Hy-Power Diode for a quantity of one. Now this diode will allow your motor home or your RV to power the lights on your tow vehicle without power feedback. The diode will permit electrical current to flow in one direction from the motor home to the car, preventing any electrical feedback and the damage that it can cause to the towed car's electrical components. It takes two power sources and can combine them into this one wire, prevents back feeding from either circuit.
And this part is for a quantity of one diode. Now it is also available in a variety of quantities. You can get the one pack like this one, a two pack, a three pack, or even a four pack. And all those quantities are available on our website.Now for the one pack like this one, you use part number RM-790. The two pack would be RM-792.
A three pack would be RM-793, and the four pack would be RM-794, and those parts are listed on this product page as a related product. Now this does reduce the wiring hassles. You can see these included spade connectors right here. Just pull one off. Then there's two more over here.
These will allow for a nice trouble-free wiring connections, and then the aluminum heat sink design on this will help prevent overheating.On the very back, you can see, it has this self stick pad that you can peel off that and allows you for a nice, easy, secure mounting of the diode. Now maximum load on this is 85 amps at 12 volts per diode. Now four diodes are normally required for most application, one for the left turning brake, one for the right turning brake, and then two for the tail lights, one on each side. But that should do it for the review on this Roadmaster Hy-Power Diode for a quantity of one.
Average Customer Rating: 4.9 out of 5 stars (171 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.I added accessory back up lights to my truck. I wanted them to work with the truck back up lights and be able to turn them on with a switch in the cab. I did not want to chance backfeed when I used the switch, so I bought this. Only have had it installed for a week and no problems works the way I wanted it to.
Works fine. Took about 5 minutes to get it installed. Thanks etrailer for having the part in stock, shipping it out quickly for a reasonable price.
Very robust and has lasted. Work exactly as needed and great customer support and quick shipping from etrailer.com. Highly recommend.
The order arrived quickly and the product was exactly as advertised. Installation was simple and quick. Thanks.
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!
Jon l - 06/20/2019etrailer is the best, I order they send, fast, also have great install videos that without would have taken me twice the time to install.
E trailer is an excellent resource for rv owners that want tech advice and support and a supply system that lets you optimize what You can do as an owner to maintain your rv. Quick shipping and very competitive prices.
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?
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!
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.
JAMES S - 11/21/2018This 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.
George C - 07/31/2015 George C - 08/04/2015Fantastic. 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.
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.
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
Easy install
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.
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
I 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
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.
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.
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.
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.
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.
Ron - 06/23/2017I 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.
Used diode in wiring dingy battery to RV to keep it charged while towing - worked great.
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