Roadmaster Battery Disconnect for Towed Vehicle w/ Flat Tow Brake System - Gas Only

Part Number: RM-766

In Stock

$216.40

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If you need to disconnect the battery to flat tow your vehicle, you're going to want this kit. It disconnects your battery with the push of a button - much safer and faster than doing it yourself - while keeping your towing accessories charged. 1-800-940-8924 to order Roadmaster accessories and parts part number RM-766 or order online at etrailer.com. Free expert support on all Roadmaster products. Great prices and Fastest Shipping for Roadmaster Battery Disconnect for Towed Vehicle w/ Flat Tow Brake System - Gas Only. Accessories and Parts reviews from real customers.

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Roadmaster Accessories and Parts - RM-766

Features:

Disconnects your battery with the push of a button
Eliminates the inconvenience and danger of pulling your battery cable yourself
Provides a positive current source for the breakaway switch and other accessories without draining the battery
Includes a corrosion-resistant, marine-grade solenoid with 200-amp constant duty and 600-amp surge
- Comes pre-assembled for easy installation

Specs:

Application: vehicles that require the battery to be 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 this 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 Switch for Gasoline Vehicles

Replaces 765

Installation Details RM-766 Installation instructions

This Product Fits The Following Vehicles

2020 - 2026 Chevrolet Blazer
2015 - 2028 GMC Canyon
2015 - 2028 Chevrolet Colorado
2006 - 2011 Dodge Dakota
2010 - 2011 Ram Dakota
2015 - 2018 Ford Edge SE models
2015 - 2018 Ford Edge SEL
2015 - 2018 Ford Edge Sport and Titanium
2019 - 2024 Ford Edge ST models
2020 - 2028 Buick Encore GX
2024 - 2027 Buick Envista
2023 - 2024 Chevrolet Equinox LT and LS models
2023 - 2024 Chevrolet Equinox Premier
2023 - 2024 Chevrolet Equinox RS models
2008 - 2009 Chevrolet Equinox Sport
2015 - 2024 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 - 2022 Chevrolet Malibu
2016 - 2019 Lincoln MKT
2019 - 2028 Lincoln Nautilus
2014 - 2028 GMC Sierra 1500
2019 - 2022 GMC Sierra 1500 Limited

See All Vehicle Fits

Customer Satisfaction Score:

93% were satisfied with this product

7% of customers were not satisfied

etrailer mistake
Wrong item was ordered
Defective

7% of customers were not satisfied

etrailer mistake
Wrong item was ordered
Defective

4.7

437 reviews

5 Stars		(354)
4 Stars		(54)
3 Stars		(8)
2 Stars		(6)
1 Star		(15)

by: Vern 09/12/2025

This is a really nice kit for remote battery disconnection.Everything needed was included and instructions were clear.
I used it on our 2026 Trailblazer. It took a little trim work on the battery post cover but nothing major. I bought some plastic push pins and used them to mount the solenoid to the wiper linkage cover.
Typical Roadmaster high quality parts.

Click to Enlarge

Lazer S.

9/16/2025

Roadmaster definitely makes good quality stuff and I am happy to hear you like it, Vern! What are you flat towing your '26 Trailblazer with?

Vern

9/16/2025

@LazerS We are towing with a new Newmar Dutch Star 4369. Thanks Vern

by: Christopher 12/12/2025 One Year Later

Everything installed easily and as advertised. This was purchased to equip our Toad and it’s worked perfectly. I saved money by getting E Trailer’s advice and getting the right parts the first time and just what I needed instead of over buying and havimg to shop back the excess.

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Nick S.

12/15/2025

That is great to hear! I am glad we were able to help you out and get you set the first go around. The vehicle setup looks great, what coach are you pulling that with?

by: Don949 01/08/2026

Works perfect. Ryan's installation video for my 2026 GMC Canyon was spot on! This made the install super easy.
As a product improvement, I would recommend adding two terminal post boots to the kit. It felt a little too exposed to leave those open.

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by: Ken P 08/16/2025

Took some planning on my 2025 Chevy Colorado. Thankfully etrailer had a video for an installation on a 2024 GMC Canyon which is identical mechanically. Their video showed cutting the factory battery cable connector to the battery post in half to make connections to the 2 solenoid cables. I just could not bring myself to doing that on a brand new vehicle. I looked for an alternative and found on Amazon a battery post adapter that has 4 posts for connecting various 12v lines. Since I have other components for my tow setup that will need power I decided this would be a good solution. Happy I did it. The original cable remains in tact in case I ever want to remove the solenoid. The install was easy, just took some time to figure out the best way to route everything in such a small engine compartment. On the Colorado when the power is restored, some sensors initially show an error, but after a few minutes everything returned to normal. This will really be a time saver during connects/disconnects for towing.

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by: Scot B. 04/03/2025

I installed this item, along with the whole towing package. Turned the key and nothing! Checked all the connections then got my volt meter out. Voltage seemed OK but continuity was all wrong. After double checking the wiring diagram, I discovered the battery cables were labeled backwards! Re-connected according to the diagram instead of labels and everything works great.

Scot B. One Year Later

4/4/2026

After a year. Its still working great.

by: EdgeMan57 05/27/2025

I just mounted this battery disconnect switch in a 2021 Ford Edge ST 2.7L to be able to tow the Edge flat. Even with the transmission park lock disabled, the vehicle's parking brake will engage if it senses motion. Ford's instructions are to remove the negative battery cable before recreational towing. That is not at all practical with this vehicle. The RM disconnect seems pretty robust, and I was lucky that the switch was in the "off" position so that I did not have any sparking while I was reconnecting the battery that was removed to run the small cable through the firewall to the switch. The etrailer installation video was very helpful. Now, why not 5 stars - first, I have not yet tried moving the Edge with the battery disconnect in the on position. More pertinent, though, is that Roadmaster's instructions are terrible and the packaging is not much better. It arrived in a box with the only thing not loose in the box was the hardware and the switch. The instructions show both big red battery cables as being labeled, but there was only ONE label and it was loose in the box. Fortunately the instructions (and also electrical/mechanical sense) showed which cable connects to the battery and which one connects to the vehicle battery cable. The instructions also say to use the two included bolts and nuts to mount the solenoid, but on the 2021 Edge, the only place to mount into metal was the engine side of the shock absorber mount. There is no way to access the ends of bolts to put nuts on.
Fortunately RM also included hefty self-tapping sheet metal screws that are not mentioned in the instructions - those are what I used to securely mount the solenoid. The only alternative choices I could find where mechanical disconnect switches that seemed to be more cumbersome and not as robustly made. I hope that this electronically activated switch will be more convenient and will hold up over time.

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by: Ron 12/20/2024 One Year Later

The battery disconnect is a game changer in towing behind our RV. No need to disconnect a battery cable every time we hook up the towed vehicle. A push of the button and the battery is disconnected. Product was shipped direct to our installer in a timely manner. Price was fair.

Ron One Year Later

12/20/2025

The switch inside the car to disconnect the battery is a game changer. I couldnt imagine having to go under the hood every time we connected or disconnected the towed vehicle. Works great!

by: Mike 06/30/2019

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.

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Mike One Year Later

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 Martin 09/09/2016

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.

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Robert M. One Year Later

9/9/2017

Still working just fine.

by: Herbert M 07/09/2017

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.

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Herbert M. One Year Later

7/13/2018

There have been absolutely zero problems with this switch so far. Works like a charm.

by: Christopher 03/24/2026

Disconnect solenoid was bad Reached out to roadmaster tech support and did what they asked by sending pictures. Took them two days to respond asking for more pictures> had to remove system so vehicle is operable told them it was removed and now no response. They told me that the solenoid should have been more upright. I installed it in the exact location that e trailer install video showed. It worked for them it should have not been a problem for me. Reach out to e trailer for replacement and no response yet.

by: Dale 04/13/2023

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.

Click to Enlarge

Dale One Year Later

4/17/2024

Works great.

Jesse M.

5/14/2024

@Dale Thanks for sharing!

by: Aaron 03/31/2024

I highly recommend this battery disconnect for the 2024 GMC Sierra Denali 1500. The electronic parking brake requires the battery to be disconnected while flat towing. GM should have made the vehicle software to not apply the brake when in Tow-mode, this makes it easy to accomplish removing battery power. I mounted the solenoid inside the passenger front quarter panel near the battery to keep the power cables as short as possible. The solenoid must be installed in the vertical position. I chose to mount the actuator button inside just above the OBD-II port under the steering column. Easy access from the driver seat but not visible or in a place that could be accidentally pushed. If you frequently flat tow the GMC/Chevy with electronic parking brakes, this is a must have!

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by: John 03/20/2026

works as it should.Solved my 2023 equinox batter drain wile towing.

by: Dennis 09/05/2026

I don't need help very often, But when I do it's nice to have that experiance/assurance on the other end of the phone. Greatly appreciated!!

by: K 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)

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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.

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by: Keith 10/06/2026

Works as it should

by: Keith 08/31/2026 One Year Later

Works great and easy install

by: Kent 11/29/2024 One Year Later

Works great!
E-Trailer did a great job and very professional!
Highly recommend!

Kent One Year Later

11/30/2025

Products you installed on my truck and motorhome are working great and am extremely happy with. Would highly recommend e-trailer!

by: Glenn 03/19/2026

I watched your install video and everything went smooth. Very happy with product

by: Brian 06/28/2022 One Year Later

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.

Click to Enlarge

by: Todd S 06/02/2026

Nice and complete kit. works well and for sure easy to use with push button feature.

by: John 05/26/2025

Excellent product, not as difficult to install as I first thought just had to fabricate a bracket for my 2024 Canyon. Great service from trailer also. Arrived on the date they said which is great considering I am in the eastern most part of Canada.

Brooke M.

5/30/2025

So happy to hear that, John! An on-time delivery is about as exciting as one that is early-especially since it seems like things are delayed all the time haha. Which province are you from?

by: Waymon 08/27/2025 One Year Later

There's a reason I by my towing accessories from Etrailer.
You guys KNOW your products and applications for us buyers.
Thanks Crew.

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