Roadmaster Battery Disconnect with Switch for Towed Vehicle w/ Flat Tow Brake System - Gas
(215 reviews)
Price: $238.02
In Stock
Roadmaster Battery Disconnect with Switch for Towed Vehicle w/ Flat Tow Brake System - Gas
Item # RM-766
Retail:$278.95
Our Price: $238.02
You Save: $40.93
In Stock
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.
- All Info
- Reviews (215)
- Q & A (0)
- Photos
Roadmaster Accessories and Parts - RM-766
- Tow Bar Wiring
- Auto Battery Disconnect
- Roadmaster
Conveniently disconnect the battery of your vehicle so you can flat tow it behind your RV per manufacturer instructions. Provides a charge for the breakaway switch and other accessories without draining the battery. For gas engine vehicles only.
Features:
- Disconnects your battery with the flip of a switch so that your vehicle can be towed behind your RV
- Eliminates inconvenience and the potential danger of pulling your battery cable
- Provides a positive current source for the breakaway switch and other accessories without draining the battery
- Operates with included switch
- Includes a corrosion-resistant, marine-grade solenoid with 200-amp constant duty and 600-amp surge
- Comes pre-assembled for easy installation
Specs:
- Application: only for vehicles that require the battery disconnected for flat towing - consult your owner's manual
- Works with almost any 12V battery
- For gas engine vehicles only
Notes:
- Not for use with diesel engine vehicles; due to the high compression ratio of diesels, the engine can surge up to 10 times that of a gasoline engine at start up and can cause the solenoid to fail.
- Disconnecting the battery, whether manually or with the Roadmaster automatic disconnect, will affect your vehicle's electronics. You will need to reset various electrical components in your vehicle following use of this product.
- A charge line kit (RM-156-25 - sold separately) is recommended if you have a braking system that is using power from the towed vehicle's battery while it is disconnected.
766 Road Master Automatic Battery Disconnect for Gasoline Vehicles
Replaces 765
Installation Details
This Product Fits The Following Vehicles
- 2020 - 2024 Chevrolet Blazer
- 2015 - 2023 GMC Canyon
- 2015 - 2023 Chevrolet Colorado
- 2007 - 2007 Cadillac CTS
- 2006 - 2011 Dodge Dakota
- 2010 - 2011 Ram Dakota
- 2019 - 2024 Ford Edge
- 2015 - 2018 Ford Edge SE
- 2015 - 2018 Ford Edge SEL
- 2015 - 2018 Ford Edge Sport and Titanium
- 2020 - 2023 Buick Encore GX
- 2022 - 2023 Chevrolet Equinox RS models
- 2008 - 2009 Chevrolet Equinox Sport
- 2015 - 2023 Cadillac Escalade
- 2016 - 2019 Ford Explorer
- 2011 - 2019 Ford Fiesta Automatic transmission
- 2016 - 2019 Ford Flex
- 2012 - 2018 Ford Focus Hatchback - Automatic transmission
- 2012 - 2018 Ford Focus Sedan - Automatic transmission
- 2008 - 2017 Smart fortwo
- 2013 - 2013 Jeep Grand Cherokee
- 2008 - 2009 Hummer H2
- 2008 - 2011 Jeep Liberty
- 2019 - 2023 Chevrolet Malibu
- 2016 - 2019 Lincoln MKT
- 2019 - 2023 Lincoln Nautilus
- 2014 - 2024 GMC Sierra 1500
- 2019 - 2022 GMC Sierra 1500 Limited
- 2015 - 2024 GMC Sierra 2500
- 2015 - 2023 GMC Sierra 3500 See All Vehicle Fits
Customer Satisfaction Score:
92% were satisfied with this product
8% of customers were not satisfied
- Wrong item was ordered
- etrailer mistake
- Product did not meet expectations
Customer Reviews
Roadmaster Battery Disconnect with Switch for Towed Vehicle w/ Flat Tow Brake System - Gas - RM-766
Average Customer Rating: 4.7 out of 5 stars (215 Customer Reviews)
Conveniently disconnect the battery of your vehicle so you can flat tow it behind your RV per manufacturer instructions. Provides a charge for the breakaway switch and other accessories without draining the battery. For gas engine vehicles only.by: 02/14/2023
Fairly easy install. Routing the wiring is the most time consuming part. I would've liked to have had heat shrink terminals sent instead of just crimp terminals but overall its a great product so far!
(Also, I would recommend using a brown wire to link the lighting together in the rear as opposed to the white wire that is recommended in the instructional video, to keep everything clear for anyone who may work on it in the future)
by: Dale04/13/2023
I had a little difficulty finding a good location for the solenoid, but finally found a spot on the radiator bulkhead. Since the photo was taken, I have added silicone boots over all of the solenoid connections.
by: Tim 11/28/2023
This was very easy to install on my 2022 GMC Canyon. I installed the button on the side of the dash, between the driver door and dash side. This way it is hidden out of view. I did the installation this way to avoid any modification to the lower dash support panel.
by: Dale09/16/2023
The first one was damaged in shipping and they sent a new one out as soon as I called at no cost to me! Great customer service! If you follow the directions it’s a fairly simple installation. It works great. One note of caution the actual plug on the disconnect buttons can be inserted two ways but will only work one way.
by: Marty 10/05/2023
The battery disconnect works flawlessly and makes hooking up the towed vehicle so simple. Highly recommend!
by: James08/15/2023
Battery disconnect was bad. Waiting on replacement for 5 days now.
by: Kevin 05/09/2023
Overall an easy 5 star rating. I read the instructions multiple times and still managed to hook up the cables backwards. Switched them and everything works fine. I really appreciated everything that you would possibly need being included - instructions said to bolt the unit in place but it worked out better for me to use the INCLUDED self tapping metal screws. Shrink wrap, protective cable looms, zip ties - you name it and it's in the box.
I installed this in my 2022 Chevy Colorado which requires the battery to be disconnected before flat towing.
by: Mike06/30/2019
The battery disconnect installation instructions were clear and the installation went well in my 2018 Chevrolet Colorado ... in spite of the kit missing a few pieces like a second star washer for connecting the two battery cables and the second piece of protective tubing. I covered the exposed energized solenoid terminals with electrical tape to prevent an potential inadvertent short in the future when working under the hood. Works as designed so far.
Mike
7/1/2020
I towed the Colorado from Maine to Arizona last winter and the battery disconnect worked well for the entire trip. It made preparing the truck for towing and driving very easy!
by: Robert Martin09/09/2016
I received the Roadmaster remote battery disconnect in a timely manner and had it installed in my 2016 Chevy Colorado by a local RV dealer. I used it for the first time this week and it worked like a charm. I didn't lose any of my preset radio stations or any other data that I know of. Pushing a button on the dash is a lot easier than disconnecting and reconnecting battery cables.
Robert M.
9/9/2017
Still working just fine.
by: Herbert M07/09/2017
The RM-766 is a solid piece of hardware and comes with absolutely everything required for the install, right down to the "Tow" and "Drive" stickers for the switch. I use it to disconnect the battery in my 2016 Ford Edge 3.5L AWD, to help make it flat towable behind my RV. It works great and I do not have to open the hood and mess with battery cables while travelling. I like it.
Herbert M.
7/13/2018
There have been absolutely zero problems with this switch so far. Works like a charm.
by: Brian06/28/2022
This product works great for our 2018 Ford Explorer. It works perfectly for our application and allows us to easily disconnect the vehicle battery when we are preparing to tow the Explorer.
by: Scott 08/22/2023
Excellent product. Good instructions. Works perfectly after a full year.
by: Ralph B.11/19/2016
I have a 2014 Silverado that I wanted to tow with my RV. In order to tow GM calls for the battery to be disconnected. This was the only product that I fond that would do what I wanted. It is slightly over priced in my opinion but it does the job. I have attached it to my aftermarket air box and ran the switch under the hood release. This way I can use the remote to unlock the doors when I am ready to unhook.
by: Garbear07/08/2023
works great and the instructions were easy to follow
by: Tony 03/28/2023
I ordered a complete set up for flat towing my chevy truck you guys were so helpful with all the parts and your tech service was excellent as well,thank-you so much
by: Michael 09/20/2023
Not installed yet but this is a integral part of my plans for this fall camping season and getting it on time adds to the optimism for a great season this year
by: Michael 09/20/2023
Outstanding all aspects
by: Gerald 09/01/2023
Looks good. watched video on website to install.
by: Marvin05/19/2023
Not happy with delivery paid extra for next day but did not show up so it was 2 day.
Katrina B.
5/25/2023
I am so sorry to hear that your order did not arrive on time. I see that our customer service department is currently working on issuing you a refund for the expedited shipping, since it was our fault.
by: Jason 05/08/2023
Works well! Mounted just under the dash in the panel.
by: John 08/24/2022
Very good braking system, battery switch, nice easy to use thanks John H
by: David 04/24/2023
Rec'd on time. Product works great.
by: Mervin 01/18/2022
It was easy to install.
Mervin
1/19/2023
Havent had any problems with the battery disconnect.
by: Mike H08/24/2017
Easy to install. My wife gets our tow vehicle ready to roll. She would not disconnect the battery cable. Now all it takes is a flip of the switch! Happy with this battery disconnect product.
Mike H.
8/24/2018
Our battery disconnect works perfectly every time. Makes preparation for towing much easier
by: Mark 04/27/2023
Quick service and delivery of correct i tems
25
215
Show More Reviews
See what our Experts say about this Roadmaster Accessories and Parts
- Will Roadmaster Battery Disconnect Fit 2019 GMC SierraIt looks like the fuse block installs directly on top of the battery for your 2019 GMC Sierra but there still should be a terminal that the positive post of the battery connects to whether it is directly to the positive post or a different location in the fuse block. I reached out to my contact at Roadmaster who confirmed that the Automatic Battery Disconnect # RM-766 will fit and suggested that you have your mechanics inspect the fuse block for a place where there is a terminal.
view full answer... - Can Roadmaster Automatic Battery Disconnect RM-766 Be Used On 2021 GMC Sierra 1500 Being Flat Towed?I reached out to my contact at Roadmaster, and the Roadmaster Automatic Battery Disconnect with Switch for Towed Vehicle w/ Supplemental Braking System # RM-766 can only be used on the positive terminal of the battery as that is what the polarity of the solenoid is designed for. My contact mentioned that nearly every owner's manual mentions disconnecting the negative terminal, but using their disconnect and disconnecting the positive terminal accomplishes the same thing. This has been...
view full answer... - Recommended Battery Disconnect For 2015 Ford Edge TitaniumI confirmed with Roadmaster that # RM-766 is the correct part to disconnect the battery on your 2015 Ford Edge Titanium and I do recommend this part for an easy way to protect your vehicle without needing to move wires each time. This disconnect makes it as easy as a flip of the switch on your dash to make your vehicle drivable or towable. I've attached an installation video of this product for your convenience.
view full answer... - Battery Disconnect Recommendation for 2015 Ford Edge V6 Titanium Flat TowedThe # RM-766 is the correct part to disconnect the battery on your 2015 Ford Edge and I do recommend this part for an easy way to protect your vehicle without needing to move wires each time. This disconnect makes it as easy as a flip of the switch on your dash to make your vehicle drivable or towable. This also will put a maintenance charge on the battery too as you drive. Ford states to disconnect the negative side so that's what we recommend sticking with. You should verify this with...
view full answer... - Will the Roadmaster Automatic Battery Disconnect Fit a 2013 Honda Fit SportYes, the Roadmaster Automatic Battery Disconnect with Switch part # RM-766 will fit your 2013 Honda Fit Sport. The reason you do not see it listed as a fit is because the owner's manual does not specify that the battery needs to be disconnected while in tow. However, the battery disconnect has a very universal design and I see no reason as to why it wouldn't work for you. I have attached a sample install video.
view full answer... - How To Install the Roadmaster Automatic Battery Disconnect On A 2019 Chevy Silverado 1500The process to install the Roadmaster Automatic Battery Disconnect part # RM-766 on your 2019 Chevrolet Silverado 1500 is a bit different than most like the ones you were referring to on our site however it can still be done. I have attached for you a few photos on this process that gives you a few options. Please let me know if you have any questions.
view full answer...
- Installing Roadmaster Automatic Battery Disconnect with Switch RM-766 on 2018 GMC Sierra 1500According to Roadmaster, the reason GM says that the negative side of the battery must be disconnected is a standard shop procedure. If you use hand tools (wrench) and start by removing the clamp on the positive side of the battery, then you might accidentally touch the wrench to a grounded component (frame, engine block, etc) on the truck and create a short circuit. Sparks will fly and the battery could be damaged. However, with the Roadmaster battery disconnect system, there are no such...
view full answer... - Does Roadmaster Battery Disconnect with Switch Solenoid Draw Power When Battery is ConnectedNo, the Roadmaster Battery Disconnect with Switch # RM-766 won't be drawing power from your battery while it is in connected mode, but it will allow power to pass through it. I confirmed this with my contact at Roadmaster.
view full answer... - Roadmaster Automatic Battery Disconnect is Disconnecting Battery when Vehicle Turning Off IgnitionI reached out to my contact at Roadmaster because I have not heard of this particular issue happening before with the Automatic Battery Disconnect # RM-766. He said it's possible that something is going on with the switch itself and there is an easy way to find this out for sure. There is a small 7.5 amp fuse at the end of the "Battery Post" cable, which is for the switch. With the unit running and on, remove this fuse to cut off power to the switch. Then start your vehicle and turn it...
view full answer... - Installation of the White Ground Wire for the Roadmaster Battery Disconnect on a GMC CanyonWhen installing the Roadmaster Automatic Battery Disconnect with Switch # RM-766 in your GMC Canyon, the white wire is the ground wire. I have attached a video that around the 2:00 minute mark goes over the installation of the white ground wire.
view full answer...
- Wheels Lock Up On 2020 Lincoln Nautilus With Battery Disconnected I did some research on the 2020 Lincoln Nautilus and I believe what you need to do to keep the vehicle in neutral with the battery disconnected is go through the "ACTIVATING THE MANUAL PARK RELEASE CABLE" procedure in the manual which I have also attached for you below. ACTIVATING THE MANUAL PARK RELEASE CABLE Apply the parking brake Note: If vehicle battery is dead, for example, no electrical power available, an external power may be required to apply the parking brake. Locate the manual...
view full answer... - Why Does Battery of 2017 Ford Focus Need to be Disconnected to Flat TowThe reason a vehicle has to have the battery disconnected when being flat towed like with your Ford Focus is that the ignition has to be in a specific position for the steering wheel to unlock which turns on several circuits which would drain the battery of the tow vehicle if it was left on. So the solution is to disconnect the battery so that you can unlock the steering wheel without draining it. That what's nice about the Roadmaster Automatic Battery Disconnect # RM-766 is that it does...
view full answer... - Why Does Battery of 2014 Ford Fiesta with Automatic Transmission Have to be DisconnectedThe automatic transmission of your 2014 Ford Fiesta shifts electronically which is why the battery has to be disconnected when flat towing as well as following all of the other procedures outlined in the manual. You will have transmission problems if you don't disconnect the battery. I found a few people online who flat towed without disconnecting the battery and they had to have the transmission rebuilt. The transmission basically dropped back into gear while they were flat towing which...
view full answer... - Flat Tow Vehicle w/ 2 batteries and the Roadmaster Automatic Battery DisconnectThe answer to your question is dependent on how the batteries are wired. The objective is to break ground causing an open circuit condition for each battery, if your batteries are wired in parallel, then you will only need the one Roadmaster Automatic Battery Disconnect, # RM-766. If in series or they are two separate circuits via an isolation switch, then you need to ensure negative side of each battery has been isolated, either with the # RM-766 or with an isolator switch already installed...
view full answer... - Does Battery of 2017 Ford Edge Get Disconnected When Flat TowedThere isn't a way around having to have your vehicle unplugged when flat towing it to the extent that it would reset your radio settings etc. The charge line kits like the # RM-766 allow you to put a maintenance charge on the vehicle's battery while the vehicle is disconnected but there isn't a way to accomplish both.
view full answer... - Correct Battery Disconnect for 2021 Chevy Silverado 1500The correct battery disconnect to use for your 2021 Chevy Silverado 1500 is the Roadmaster Automatic Battery Disconnect with Switch # RM-766. This makes disconnecting your battery as easy as pressing a button instead of having to physically get under the hood and disconnect your cable. Attached is an installation video of this kit on a 2020 Chevy Silverado 1500 for you to check out. If you're looking to flat tow your truck then you'll also need a base plate kit, tow bar, safety cables,...
view full answer... - Recommended Battery Disconnect Switch for Two 6V Batteries Connected in Series It sounds like you are needing a battery disconnect like the Roadmaster Automatic Battery Disconnect with Switch # RM-766. This kit will allow you to disconnect the batteries with just a flip of a switch. I have attached the complete installation instructions that you can take a look at, along with an image that shows how the unit will be connected to the battery.
view full answer...
- Can Roadmaster Battery Disconnect be Used on Negative Side on 2018 Ford FocusOn your 2018 Ford Focus the Roadmaster Battery Disconnect with Switch # RM-766 can only be used on the positive terminal of the battery as that is what the polarity of the solenoid is designed for, per Roadmaster.
view full answer... - Will Adding the Roadmaster Automatic Battery Disconnect on 2018 Ford Focus Void Warranty?The Roadmaster Automatic Battery Disconnect with Switch for Towed Vehicle w/ Supplemental Braking System # RM-766 will not violate your vehicle warranty according to the Magnuson-Moss Warranty Act because no damage will be caused as a result of adding this part, but it does make it possible to flat tow your 2018 Ford Focus without disconnecting the battery. The idea is to cut the power supply to the vehicle components when the switch is flipped so it will protect your vehicle from draining...
view full answer... - Installing Roadmaster Automatic Battery Disconnect with Switch on 2016 Chevrolet ColoradoAccording to the online owner's manual for the 2016 Chevrolet Colorado, you will need to disconnect the negative battery cable at the battery and secure the nut and bolt before flat towing the truck. It states that failure to do this may cause damage to the vehicle. When installing the Roadmaster Automatic Battery Disconnect with Switch # RM-766 referenced in your question, you will first follow the vehicle manufacturer's instructions to disconnect the negative battery cable. Then from...
view full answer... - Can the Roadmaster Batttery Disconnect Switch Be Mounted To Negative Battery Terminal 2002 Spark? The Roadmaster Automatic Battery Disconnect with Switch # RM-766 must be connected to the positive battery terminal on your 2022 Chevrolet Spark. The reason your owners manual says to remove the negative battery cable is that is the safe way of physically disconnecting the battery terminals. If you were to attempt removing the positive battery terminal with the negative terminal connected you are at risk of hurting yourself. If you were to accidently touch the tool you are using from positive...
view full answer... - Automatic Battery Disconnect For 2021 GMC CanyonWe do have the automatic battery disconnect for your 2021 GMC Canyon, which is the following part number: - Roadmaster Automatic Battery Disconnect with Switch for Towed Vehicle # RM-766 Please take note that this will NOT fit diesel models or models with dual batteries (there isn't a switch for those models). But otherwise, the # RM-766 will make disconnecting the battery in your '21 Canyon much, much more convenient for you.
view full answer... - Can Roadmaster Automatic Battery Disconnect be Used on Positive Terminal of 2014 Jeep Wrangler The Roadmaster Automatic Battery Disconnect # RM-766 referenced in your question can absolutely be installed on your 2014 Jeep Wrangler Unlimited but it does need to be installed on the positive battery terminal. As you mentioned, the manual for your Jeep recommends disconnecting the negative terminal when flat towing, which provides a bit of a contradiction with the instructions for the Roadmaster Battery Disconnect. This recommendation is present in a lot of vehicle owner's manuals...
view full answer... - What is Length of Cables that Come on Roadmaster Automatic Battery DisconnectThe length of the cables of the Roadmaster Automatic Battery Disconnect with Switch part # RM-766 is 2 feet.
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:
Adam R
Expert Research:
Jeffrey L
Installed by:
Jeff D
Video Edited:
Joshua S
Video Edited:
Jacob T
Video Edited:
Kathleen M
Video Edited:
Dustin K
Video Edited:
Chris R
Video Edited:
John S
Written by:
Laura H
Test Fit:
Randy B
Test Fit:
Andrew S
Test Fit:
Brent H
Test Fit:
Shane H
Test Fit:
Robert C
Test Fit:
Conner L
Test Fit:
David F
Test Fit:
Ryan G
Test Fit:
Clayton O
Test Fit:
Kevin C
Test Fit:
Bradley B
Test Fit:
John A
Updated by:
Wilson B
Updated by:
Isabelle B
Updated by:
Carrie F
Updated by:
Amanda K
Video by:
Zach D
Video by:
Jonathan Y
Video by:
Michael B
Video by:
Jacob H
Video by:
Aidan B
Video by:
Thomas T
Video by:
Charles A
Video by:
Ethan H
Video by:
Rick G
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. Let us know if anything is missing or if you have any questions.
Product Experts Available Now!
Call 1-800-940-8924
Jenny N.
8/18/2023
I checked with Roadmaster and I know that they are working on a replacement for you.