Roadmaster Single Park Light Diode
(95 reviews)
Price: $19.91
In Stock
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- Reviews (95)
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Roadmaster Accessories and Parts
- 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
Item # RM-690
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
1% of customers were not satisfied
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Customer Reviews
Roadmaster Single Park Light Diode - RM-690
Average Customer Rating: 4.9 out of 5 stars (95 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: Logan 02/03/2024
Worked perfectly, just needed to buy 4 more!
by: Mark 01/09/2024
Great product that works as it’s supposed to…
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.
by: 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 .
Craigc
11/14/2016
Its been one year now and a diodes are still doing their job
by: 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.
Cbtraveler
12/19/2017
Product is still working fine without any 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).
John F.
9/9/2020
It still works as intended with no problems.
by: David 08/15/2023
No problems. Works as it should
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!
John O.
4/25/2018
One year later its still working as good as new! very happy with this product.
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: 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: Ronald02/05/2021
Ronald
2/6/2022
This has worked great on my boat keeping my trolling battery charged while fish. It keeps it topped off.
by: 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: Miles 07/31/2020
I got this to isolate my emergency brake disconnect battery from the main trailer battery. I would have preferred if the included wire crimps were the heat shrink type. Shipping took forever and was not trackable. Otherwise, this was a super easy product to install. Thank you etrailer for making it easy!
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: 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: 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: 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: 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: 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: Jon r 08/23/2019
Used in a trailer so the break away battery didn’t back feed the dump body battery or drain it. Both charged in series.
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See what our Experts say about this Roadmaster Accessories and Parts
- How To Install Diodes with Curt 2 to 3 Wire Tail Light ConverterIn regards to the Curt 2 to 3 Wire Tail Light Converter part # C56196, you will need to install diodes part # RM-690 between the trailer tail lights and converter. The "out" side goes to the tail light and the "in" side goes to the converter. There will need to be one diode on each circuit for a total of six.
view full answer... - Will Diode Protect Wiring on Trailer From Backfeeding to Trailer LightAdding a diode like the Roadmaster Single Park Light Diode # RM-690 will help isolate that trailer light and will protect it from backfeed. I do recommend checking all of your grounds and connections though because if you protect this one and the issue is on the main wire then it might cause backfeed to go to a different light.
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... - How to Prevent Trailer Battery From Backfeeding to Vehicle BatteryWhile unlikely, it is certainly possible that the trailer battery could backfeed to your vehicle's battery when hooked up under the scenario you described. To make sure this doesn't happen all you need to do is add a single diode like the Roadmaster # RM-690. This will install between the trailer battery and 7-Way and will only allow power to travel in one direction (to the trailer battery). This particular diode is rated at 85 amps.
view full answer... - Does Breakaway Battery Charger 20011 Have Built-In DiodeThere is not a built-in diode on the Trailer Breakaway Kit Battery Charger # 20011. There isn't one that does have a diode but you can add one with the Roadmaster Single Park Light Diode # RM-690.
view full answer... - Should The Trailer 12 Volt Hot Wire Be Connected To Hot Wire On Vehicle 7-Way? A Diode # RM-690 can be used to prevent battery power from your trailer traveling to your tow vehicle. This diode is rated up to 85 amps which is more than the charging system on your vehicle is capable of providing. Having it connected hot to hot allows you to use your vehicle power to charge the battery and also power any lights or electric jacks off your vehicle when the trailer battery is dead. If your trailer only uses the power for a breakaway battery you can instead us the Charger...
view full answer... - Recommended Diode for 2017 Toyota Highlander To Prevent Lane Departure and PreCollision Dash WarningOn your 2017 Toyota Highlander, you are experiencing feedback from your brake controller onto that stop light switch which is causing the error messages you mentioned. You will want to install a diode on the red wire leading to the brake controller to prevent this feedback and subsequent error message. There should be an arrow or label of in and out to ensure you install the diode in the correct manner as you want the power on that red wire to flow toward the brake controller not away...
view full answer... - Troubleshooting Recharge Light on Hopkins Breakaway Kit Staying On When Trailer Is DisconnectedThere is two possible causes making the light on your Hopkins Engager Push-To-Test Trailer Breakaway Kit w/ Built-In Charger - Side Load - 7" Wire # 20099 to stay on even when the trailer is disconnected. The first is if you have the # 20099 wired to an on-board battery on your trailer it is likely feeding the breakaway battery, and you will need to install a diode # RM-690 to fix this. If there is no on-board battery on your trailer then the circuit board has an internal issue and you...
view full answer... - Preventing Trailer Battery From Backfeeding to Vehicle Battery on 2003 Toyota Land CruiserIn order to make sure your battery does not backfeed into your 2003 Toyota Land Cruiser all you need to do is add a single diode like the Roadmaster # RM-690. This will install between the trailer battery and 7-Way and only allows power to travel in one direction.
view full answer... - Preventing Pre-Collision Warning of 2018 Toyota Highlander After Brake Controller InstallFor your 2018 Highlander and the Redarc brake controller # RED44FR you'd need to install a diode on the red wire of the brake controller to prevent voltage from back feeding on your brake light circuit. For a diode you could then use the part # RM-690.
view full answer... - When are Isolating Diodes Required for Installing the Curt 2-Wire to 3-Wire ConverterThe answer actually isn't very technical. Curt doesn't require that diodes be used with the Converter # C56196 however some Experts still like to recommend using a diode like part # RM-690 to prevent backfeed just because you are adding something different to the original wiring. If you are connecting this to the OEM wiring on a pickup for a 3rd brake light then a diode would be a good idea, but if you are only splicing this into some trailer wiring a diode isn't necessary. It never...
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- 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... - Tow Bar Lighting Recommendation for 2017 Jeep Wrangler that Doesnt Cut or SpliceThe Trailermate part # TM781124 that you referenced may not be officially listed as a carry over to the 2017 Jeep Wrangler at this time (July 2017), but it uses the exact same connectors as the Hopkins kit part # HM56200 which is a confirmed fit so there is no reason it wouldn't work. The Hopkins kit part # HM56200 is the better option though. It has a converter box in it that prevents the backfeeding of the voltage to the tow vehicle. So you will want the part # RM-690 diodes with the...
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... - Which Direction Should Diode Face to Prevent Manual Override Backfeed 2018 Toyota HighlanderIf the goal is to prevent the stoplight circuit of a brake controller from putting voltage back onto the vehicle wiring when the manual override lever is slid the diode like the part # RM-690 would have to have the output side face the controller. The out side of the diode is the direction voltage can flow through so allowing the vehicle to send voltage to the controller but not the other way around would mean having the diode have the out side face the controller.
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...
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- How to Power Camper Exterior Lights without Hooking Up to Tow Vehicle If you are just wanting a way to power your exterior camper lights without having to hook up to the tow vehicle, your best option will be to wire the lights up to the positive terminal on a trailer mounted battery. You will want to run the wire from the battery to a switch like # PK34571, then from there to a diode # RM-690 and then on to the lights you are wanting to power. Otherwise there isn't really an easy way to plug your camper directly to AC power, as trailer lights and accessories...
view full answer... - Way to Get Brake Light Circuit for SMI DUO Installed on 2012 Chevy CruzeTo give you a brake light signal the easiest option will be to wire one to your Cruze's brake pedal with the part # RM-751451. This is a custom fit switch kit for your 2012 Chevy Cruze that will give you a 12 volt signal when the brakes are applied. You can use this circuit for SMI DUO part # SM99251. This will cover the stop light and blinker circuits. For diodes to prevent back feeding you'll need the part # RM-690 and you'll be set. These install on the Trailermate wiring and not the...
view full answer... - Wiring In A Third Brake Light On A 2024 Ford F-250 Hi Cliff, To connect your third brake light to the 7-way connector you'll need to pick up the 3rd Brake Light Logic Module # PP20-702. This will have a green wire to run up to the brake light for it's power and two yellow wires to will separately connect to your left and right turn signals. You can either splice these into the backside of the 7-way or you could wire them to a 7-pole connector like # PK12706 and plug it into the 7-way. You'll need some extra 14AWG wire and a few heat shrink...
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- 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... - Do I Need Diodes After Installing a Wiring Harness on a 2006 Honda CR-VYes, you can use the trailer wiring harness with the Roadmaster InvisiBrake. Since you will be using the supplemental braking system Roadmaster InvisiBrake # RM-8700, you will need to install Roadmaster diode # RM-690 (one on the right turn/brake which is green wire and one on the left turn/brake circuit which is yellow wire) to prevent back feed into your RV wiring. I included an installation video on the InvisiBrake for you too.
view full answer... - Is Diode Needed to Prevent Trailer Battery from Backfeeding to Breakaway SystemYes, you will want to use a single function diode, like part # RM-690. You will need to wire it in between the breakaway battery and the trailer battery to stop the backfeeding from the battery to the breakaway system.
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... - Redarc Tow Pro Elite Brake Controller Installation in 2018 Toyota Highlander XLT with Tow PackageTekonsha, one of our brake controller resources, has told us that a diode like # RM-690 is needed on the 2018 Higlander brake light circuit to prevent the controller from backfeeding onto the vehicle wiring. The side labelled "in" goes to the vehicle wire. Connection of your Redarc, like any other trailer brake controller, will be as follows: Controller RED to COLD side of brake light switch (via the diode). Use a tester like # PTW2992 to help you find the wire that goes hot only when...
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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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Greg S.
10/9/2018
Towed that Jeep to several places last year. Still works just like its supposed to.