Roadmaster Single Park Light Diode
(91 reviews)
Price: $16.99
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Roadmaster Single Park Light Diode
Item # RM-690
Retail:$32.44
Our Price: $16.99
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Roadmaster Accessories and Parts - RM-690
- Tow Bar Wiring
- Diodes
- Roadmaster
Electrical damage can occur to the towed vehicle if its headlights are turned on while still connected to the motorhome. The Park Light Diode from Roadmaster will stop any interaction between the two park light systems, preventing electrical feedback and electrical damage.
- Maximum load is 85 amps at 12 volts per diode
- Qty: (1) Diode
690 Roadmaster Single Park Light Diode
Video of Roadmaster Single Park Light Diode
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 - Single Park Light Diode - RM-690
Hello everybody, this is Jeff at etrailer.com. Today we're gonna take a look at this Roadmaster Single Park Light Diode. Now basically when you're flat towing your vehicle electrical damage can occur to the tow vehicle, if it's headlights are turned on while you're still connected to the motor home. So this park light diode here from Roadmaster will stop any interaction between the two park light systems preventing electrical feedback and electrical damage. Now they do recommend installing this diode directly behind the electrical socket on the front of your vehicle. However, it can be installed anywhere in line before the connection to the towed vehicle's wiring.
This does have nice aluminum heat sink which prevents overheating. On the back, you can see it has a nice self stick adhesive pad for secure mounting. Maximum load is 85 amps at 12 volts per diode and this part is for a quantity of one diode. But that should do it for the review on the Roadmaster Single Park Light Diode..
Customer Satisfaction Score:
99% were satisfied with this product
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Customer Reviews
Roadmaster Single Park Light Diode - RM-690
Average Customer Rating: 4.8 out of 5 stars (91 Customer Reviews)
by: Gary C02/03/2018
My application is a little different. I had used a relay to feed battery voltage directly to the ignition coil on my 65 Corvair. The alternator warning light back fed from the battery causing the engine to keep running with the key off. I installed the diode in the line to the warning light. Problem solved. Great product. Easy to install and works as described.
by: David 08/15/2023
No problems. Works as it should
by: Travis 09/29/2022
excellent i used this so i could run my 12 volt lights on enclosed trailer either of the 7 way or the on board battery in trailer
by: Greg S.10/06/2017
Used this in conjunction with a 12V charge line from my Class A motorhome to the battery in my Jeep to provide charge to battery when towing and using BrakeBuddy. Prevents backflow discharge when stopped. Also put in fuse at front of coach and fuse at Jeep battery as protection for 12V system in case of chaffed wire or grounding.
Comments
Towed that Jeep to several places last year. Still works just like its supposed to.
Greg S - 10/09/2018by: Craigc11/15/2015
I bought 3 diodes for my 09 Saturn that was back feeding to my RV. This took care of the problem. Easy is it to install and peace of mind that I won't have a problem now . Had I known I didn't hade diodes on my wiring harness I would install them at the same time .but buyer beware on buying other people's products not for E trailer .
Comments
Its been one year now and a diodes are still doing their job
Craigc - 11/14/2016by: CBTraveler12/19/2016
Very fast and easy transition. My order was delivered quickly and on delivered on time. This is my first purchase from etrailer, and I plan to buy from them again.
The product will be used in the 12 volt output of a Motorhome trailer connector to feed a tow vehicle. The diode is rated at 85 amps which covers any need I might have. The construction of the diode is first rate.
Comments
Product is still working fine without any problems
CBTraveler - 12/19/2017by: Brett T04/03/2023
Great super fast efficient service and solution to problems
by: John F.09/08/2019
Works as described. I used it in the charge line from the motorhome to the towed vehicle battery (2012 CR-V, diode in from charge line, diode out to CR-V battery).
Comments
It still works as intended with no problems.
John F - 09/09/2020by: Steve03/12/2019
Product serves my application. Wanted to be sure that the break away emergency battery power on trailer brakes, when activated, would not back feed to my truck and damage factory brake controller.
Installed in 7 conductor cable between truck and trailer. Under test it works fine. Hope I never need it on the road. Recommend it for protection from back feed voltage. Could be used in any DC voltage system when the flow of current must be controlled or protected.
by: Loren03/16/2015
Pretty basic item here, it prevents current from going back and forth. And it does just that! Worked perfect for my situation on the living quarters gooseneck horse trailer. I had installed a new battery breakaway system that charges the battery when the trailer is plugged in to the truck. However in my case, when the trailer wasn't plugged into the truck, I was getting current back through the wiring harness from the house batteries that was charging the breakaway battery. Not good as over a short time period it would have drained the house batteries. This little item prevents that from happening. Thanks Guys!
by: Skip 05/26/2020
Didn't know I needed this to wire my 7 pin connector for trailer brakes. My neighbor told me I would need it so I ordered it. It works great. I suggest you mention it when someone orders a 7 pin wiring harness for a newer car.
by: tim p09/05/2019
The road master diode worked perfect I used it as a battery isolater between my trailer winch battery and my trailer brake battery so when I would use the electric winch it doesn't drain my trailer brake battery with combination with a isolater switch so long u wire it correctly it works perfect.
by: John O04/25/2017
This product works exactly as desired. The packaging is excellent, and it did the trick. I'd definitely recommend it to prevent backfeeding.
I'm very happy with etrailer, their selection of products, pricing, and their information. They truly differentiate themselves with the value add, yet keep the cost competitive. Way to do business!
Comments
One year later its still working as good as new! very happy with this product.
John O - 04/25/2018by: Big Steve05/10/2011
Great 'insurance' policy for any towed vehicle. It never fails... you get to your destination, you are tired, you jump in your towed vehicle and turn on the lights. Too late! The damage is done. If you haven't turned of the lights of your coach and your towed is hard wired to use it's own lighting as 'trailer' lighting, you NEED THIS DIODE. A breeze to install and a cheap failsafe .
by: Ronald02/05/2021
Comments
This has worked great on my boat keeping my trolling battery charged while fish. It keeps it topped off.
Ronald - 02/06/2022by: Charles03/16/2022
Product is great. Shipping department let me down for the first time. I had to call and ask why I didn’t get the email that the part had shipped after 4 days. Part shipped the next day. Person said shipping department was backed up with orders. Don’t believe it. Someone messed up I’m sure.
by: Keith10/30/2018
Does what it's supposed to do. My warning lights do not come on anymore. That being said, it should be included or recommended for the Tekonsha brake controller system. I guess all vehicles don't have that problem, but why take the chance. I have a 2017 Toyota Highlander Hybrid.
by: Larry P.09/02/2016
I have a Class A Rv and it has a hydraulic pump on the brake lite switch. I was getting a back feed from the running light back to the pump. I installed this diode and it stopped the back feed. Works great and fast shipping from Etrailer. Thank you Ashley E. for all your help. I couldn't figure out what would solve this problem.
by: Chuck 09/28/2022
The dude I ordered got to me on time and it worked exactly as I hoped it would and since then I have ordered additional items! Good folks!
by: Dennis02/16/2018
Fast free delivery, Installed very easily, works perfectly!
This product was installed to protect my roadmaster invisibrake system when using the Hopkins towed vehicle light kit on my 2015 Jeep Wrangler.
by: Rich02/09/2017
Installed the diode in-line coming off my brake wire to my tail lights to my third brake light on my 1941 hot rod. It keeps the turn signals, and running lights from ''feeding into '' my third brake light bar in my back window. Very easy to install.
I ordered two just because they are so handy to have around the shop.
by: Russ T.04/25/2017
I had been looked for a towed vehicle lighting solution for a while and ran across this item on the etrailer web site. This is an easy to use product that is also economical. Installation was exactly as the package described - simple. Etrailer alsways has great prices and fast service. I've used them for all of my trailer parts needs for 5 years and will continue to be a customer.
by: Rich01/22/2019
Diode itself seems fine. But the connectors were loose fitting and the sleeve that fits over the wire was either too thin or too soft. As a result, when crimped onto the wire, the wire was still loose and came out with a light tug. Replaced the connectors with better ones. Is now working fine.
by: Josh B03/24/2017
This diode done extremely well for my application. Used it on my box trailer. Made it where when I go to back up the strobe lights com on with the back up lights and horn and the horn or the back up lights will come on when I use the switch for the strobes
by: Fred G.04/07/2017
I was adding a center brake light on the rear of my 5th wheeler. These diodes along with with a light converter did exactly was I needed.
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See what our Experts say about this Roadmaster Accessories and Parts
- How to Wire the Roadmaster Single Park Light Diode # RM-690Wiring in the parking light diode # RM-690 is easy. All you have to do is locate the wire leading to the parking light bulb. Cut the wire and insert the diode in-line with the wiring. The IN side will be the part of the wire that leads to the front of the vehicle. The OUT side goes to the bulb. Using these diodes prevents back feeding problems when using a supplemental braking system. I included a picture showing how you would wire the diode.
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- Is Diode Needed when Running Trickle Charge Wire Off 12 Volt Circuit for Lube Pump when Flat TowingYes, you would want to install a diode such as # RM-690 to prevent power from flowing from the battery back to either the trailer connector or the pump. Your vehicle may have some feature that stays powered on when the key is in the tow position.
view full answer... - What is the Voltage and Amperage Rating for Roadmaster Parking Light DiodeThe diode # RM-690 can handle up to 120 volts at 24 amps so it should work just fine for your needs provided nothing else exceeds 120 volts at 24 amps. Regarding your picture, most battery chargers or batteries on vehicles say not to ground the charger to the battery being charged so you will want to change that to a chassis ground. The AC/DC transformer would have to have the proper output voltage and amperage so as not to blow the fuse associated with the stereo. There needs to be...
view full answer...
- Diode Recommendation for Preventing Battery from Draining Other BatteryThe diode part # RM-690 that you referenced would be perfect for what you are looking to do. It will allow current to go from the one battery to other but not in the other direction. Basically you just need to install it between the two batteries with the in/out facing the right direction.
view full answer... - Can Diodes be Used to Prevent ATV Batteries from Draining Each OtherThe Diode part # RM-690 is designed to only allow current to flow in one direction. You could use it to run the charge wire to each battery so that they couldn't drain or charge each other. And then from each battery run a wire to wherever you need current and the two would be separate.
view full answer... - Diode Recommendation to Prevent Trailer Battery From Backfeeding onto Vehicle WiringIf all you want is to prevent the 12 volt power supply of your trailer battery wiring from backfeeding onto your vehicle wiring or vice versa what you need is a one-way diode like part # RM-690. This only allows current to flow in one direction so you'd just need to install it inline with your trailer wiring matching the in and outside to your setup and you'd be good.
view full answer... - Roadmaster Single Park Light Diode Item # RM-690 Amperage and Voltage RatingThe Roadmaster diode part # RM-690 is designed for 12 volt systems and is rated for up to 85 amps.
view full answer... - Installing Diodes To Prevent Backfeeding From Towed 2012 Jeep Wrangler Sport To MotorhomeYou are getting backfeed from the Jeep through the wiring harness back to the motorhome. I spoke to my contact at TrailerMate and they told me the diodes included with this system are not designed to prevent backfeed. We have a solution that will take care of that. You will need to install diodes like part # RM-690 on the yellow left turn wire at the back of the connector on the harness that plugs into the left tail light assembly, and also on the green right turn wire at the back of...
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- Wiring Trailer for Two Batteries, Breakaway Battery and Auxiliary BatteryTypically people will let the breakaway battery run the breakaway system and then would use the accessory battery to power the interior lights etc. This tends to work the best since your breakaway battery needs to always be charged and interior lights could potentially drain the battery of the trailer. Since when you charge two batteries on the same circuit you have the potential to end up draining both the solution is to install a diode on the circuit to prevent this like the part # RM-690. I...
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- Recommendation for Wiring Breakaway and Marine Battery on Enclosed TrailerFor your enclosed box trailer, it is best to let the breakaway battery run the breakaway system and use the accessory battery to power your trailer's interior lights (or other parts). This is the best option because your breakaway battery needs to be completely charged at all times and it's possible that the interior lights can drain the battery of the trailer. As you mentioned in your question, when charging two batteries on the same circuit, there is the potential for draining both....
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- Can Breakaway Battery be Used to Power Dome Lights?You do not want to use the battery from your breakaway system in order to power the dome lights on your trailer because you do not want to end up draining the breakaway battery. What you will need is an auxiliary battery and on the circuit install diode # RM-690 to prevent draining both batteries.
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- Recommended Diode for Charging Line From Motorhome to Towed Vehicle (Toad)The diode that you want for your charging line from your Motorhome to your towed vehicle (Toad) is the Roadmaster Single Park Light Diode # RM-690. This diode will allow up to 85 amps at 12V and will only allow power to flow in one direction to protect your other systems. I've attached a video to assist.
view full answer... - Can Diode RM-690 be Used with 6 Volt SystemOur diode kit part # RM-690 are rated for up to 24 volts which means they would work fine with 6 volts.
view full answer... - Will Roadmaster Single Park Light Diode Get Hot To The TouchThe Roadmaster Single Park Light Diode, part # RM-690 can get warm to the touch when it is being used. It is best not to have it mounted inside a covered box along with other wiring to be on the safe side.
view full answer... - Is there a Way to Wire Trailer Rear Loading Lights to Work with Reverse Light Circuit on 7-WayIf you want the loading lights on the trailer to function with both the switch and batteries as well as off of the reverse light circuit from a 7-Way trailer connector you can certainly make that happen. But instead of the reverse light circuit wired to the switch you would tee it in after the switch. If not then the switch would have to be on all the time and you would have to disconnect the loading lights from the batteries. If the lights weren't disconnected from the batteries the loading...
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- Should Center Pin of Trailer Wiring Carry 12 Volts When Trailer Battery is ConnectedThe center pin of your 7-way really should only have voltage when the reverse lights are on. It's possible the trailer has that circuit also ran as an additional accessory circuit but that's not always the case. It's hard to say if that would be an issue. One easy solution though would be to install the diode part # RM-690 on that circuit of the trailer's wiring. It would prevent the voltage from going back to the tow vehicle.
view full answer... - Is a Diode Required on the 12 Volt Pin for Charging a Trailer BatteryYou do not need to have a diode between the two 12 volt batteries on your trailer and tow vehicle but it is not a bad idea either. The Roadmaster Single Park Light Diode part # RM-690 will work perfectly for this. The factory 12 volt pin on most 7-way trailer connector is keyed so if yours is not or you do not have a factory 7-way then I do recommend using the diode.
view full answer... - How to Charge Two Different Trailer Batteries With Once Power Source without Depleting EitherWhat you would need to do is use diodes on each charge wire so that the amperage can charge each battery but the batteries wouldn't try to charge each other when not connected to a tow vehicle. For that you would need to Y the charge wire that runs to your current battery thats getting charged and then run a diode on each of the wires from that main wire to each battery like with part # RM-690. The diode basically only allows amperage to travel one direction.
view full answer... - Could Single Park Light Diode #RM-690 Be Used On Other Taillight Circuits Besides Running LightsYou would be able to install the Diode part # RM-690 on any circuit you wanted to protect. We have some people who use them to prevent backfeeding while charging the battery or for TrailerMate wiring kits we have found that you do need to install a diode on all three circuits if using an Invisibrake. You are also correct that installing these on the motorhome side of the wiring would allow you to only have to install the diodes once and not on every single vehicle you flat tow.
view full answer... - Maximum Amperage of Roadmaster RM-690 Park Lamp Diode at 12-Volts DCAt 12 v DC, the maximum amperage of the # RM-690 park light diode is 85 amps, which should be plenty high enough for anything you'd run into.
view full answer... - Which Side of Roadmaster Diode Goes to RV and to the Towed VehicleThe IN side of the Roadmaster Diode part # RM-690 goes to the motorhome side of the wiring and the OUT side goes to the vehicle being towed.
view full answer... - Will Auxiliary Lights on Tow Vehicle Automatically Light Up When Connected to Reverse CircuitAs long at the center pin of the 7-Way connector on your tow vehicle receives power when you put the vehicle in reverse then auxiliary backup lights will light up automatically when you put the vehicle in reverse. I do recommend installing diodes like part # RM-690 just to ensure that any issues that may arise with the auxiliary lights doesn't backfeed into your vehicle wiring.
view full answer... - Diode Recommendation to Prevent Winch Battery on Trailer from Charting Breakaway BatteryYes, your idea of using diodes will work to prevent the winch battery from charging the breakaway battery. The diode part # RM-690 would be perfect for what you are looking to do. It has an 85 amp rating.
view full answer... - Can Roadmaster Diodes part # RM-690 be Used on Tow Vehicle WiringYes, you could install the Roadmaster Diodes part # RM-690 on the wiring of a tow vehicle if you wanted to.
view full answer...
Do you have a question about this Accessories and Part?
Info for this part was:
Expert Research:
Mike L
Expert Research:
Michael H
Expert Research:
Jameson C
Expert Research:
Jeffrey L
Video by:
Andrew K
Installed by:
Jeff D
Video Edited:
Jacob T
Test Fit:
Randy B
Updated by:
Wilson B
Updated by:
Hannah L
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